csejavalab

7/28/2019 csejavalab

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SURYA GROUP OF INSTITUTIONS

SCHOOL OF ENGINEERING AND TECHNOLOGY

VIKIRAVANDI-605602

CS2309 JAVA LAB

LAB MANUAL

III YEAR B.E (COMPUTER SCIENCE AND

ENGINEERING)

Prepared by

S.VARADHARAJAN

ASSISTANT PROFESSOR

DEPARTMENT OF COMPUTER SCIENCE AND

ENGINEERING


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CS2309 JAVA LAB L T P C0 0 3 2

1. Develop Rational number class in Java. Use JavaDoc comments for documentation. Your

implementation should use efficient representation for a rational number, i.e. (500 / 1000)

should be represented as ().

2. Develop Date class in Java similar to the one available in java.util package. Use JavaDoc

comments.

3. Implement Lisp-like list in Java. Write basic operations such as 'car', 'cdr', and 'cons'. If L is

a list [3, 0, 2, 5], L.car () returns 3, while L.cdr () returns [0, 2, 5].

4. Design a Java interface for ADT Stack. Develop two different classes that implement this

interface, one using array and the other using linked-list. Provide necessary exception

handling in both the implementations.

5. Design a Vehicle class hierarchy in Java. Write a test program to demonstrate

polymorphism.

6. Design classes for Currency, Rupee, and Dollar. Write a program that randomly generates

Rupee and Dollar objects and write them into a file using object serialization. Write another

program to read that file, convert to Rupee if it reads a Dollar, while leave the value as it is if

it reads a Rupee.

7. Design a scientific calculator using event-driven programming paradigm of Java.

8. Write a multi-threaded Java program to print all numbers below 100,000 that are both

prime and fibonacci number (some examples are 2, 3, 5, 13, etc.). Design a thread that

generates prime numbers below 100,000 and writes them into a pipe. Design another thread

that generates fibonacci numbers and writes them to another pipe. The main thread should

read both the pipes to identify numbers common to both.

9. Develop a simple OPAC system for library using even-driven and concurrent programming

paradigms of Java. Use JDBC to connect to a back-end database.

10. Develop multi-threaded echo server and a corresponding GUI client in Java.

11. [Mini-Project] Develop a programmer's editor in Java that supports syntax highlighting,

compilation support, debugging support, etc.

TOTAL= 45

PERIODS


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REQUIREMENTS

HARDWARE:

Pentium IV with 2 GB RAM,

160 GB HARD Disk,

Monitor 1024 x 768 colour

60 Hz.

30 Nodes

SOFTWARE:

Windows /Linux operating system

JDK 1.6(or above)

30 user license


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TABLE OF CONTENTS

LIST OF EXPERIMENTS

1 Rational number

2 Date class in Java

3 Implement Lisp-like list in Java.

4

Java interface for ADT Stack using array and the sing linked-

list.

5 Polymorphism

6 object serialization

7 scientific calculator

8

Multi-threaded Java program

Fibonacci number (some examples are 2, 3, 5, 13, etc.).

prime numbers below 100,000 and writes them into a pipe

Main thread should read both the pipes.

9 A Simple OPAC system for library

10 Multi-threaded echo server GUI client.

11 [Mini-Project] programmers editor.


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Ex No1: Rational Numbers

AIM

To write a Java Program to develop a class for Rational numbers.

ALGORITHM:

Step 1:-Declare a class called Rational and invoke a function called gcd(a,b).

Step 2:-Find out the reminder when a is divided by b and pass it as a parameter to the function.

Step 3:-Create an object for the class and declare the required string and integer variables.

Step 4:-Create an object of class DataInputStream .Read the numbers through the ReadLine() method

into the object.

Step 5:-Convert the input accepted into Integers through the parseInt method and store them in

variables a and b.

Step 6:-store the value returned by the function GCD in variable l.

Step 7:-Divide a by l and b by l and store them in variables x and y.

Program:-

import java.io.*;

class rational1

{

public rational1(){}

public long gcd(long a,long b)

{

if(b==0)

return a;

else

return gcd(b,a%b);

}

}

public class rational


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{

public static void main(String args[])throws IOException

{

/**

* create and initialize a new Rational object

*/

rational1 r=new rational1();

/**

* The Numerator and Denominator part of Rational

*/

long a,b,x,y;

String str;

DataInputStream in= new DataInputStream(System.in);

System.out.println("Enter the value for A");

str=in.readLine();

a=Integer.parseInt(str);

System.out.println("Enter the value for B");

str=in.readLine();

b=Integer.parseInt(str);

long l=r.gcd(a,b);

System.out.println();

System.out.println("The GCD of the number is:"+l);

x=a/l;

y=b/l;


System.out.println("The resultant value is: "+x+"/"+y);

}

}


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Output

Enter the value for A

500

Enter the value for B

1000

The GCD of the number is:500

The resultant value is: 1/2

Result

Thus the above program was executed and verified successfully.


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Ex No 2: Date Class in Java

AIM

To design a Date class in Java.

ALGORITHM:-

Step 1: Declare a class called Date example and create an object called date.

Step 2:- Display the Date and Time through these objects with the Methods in Date Class.

Step 3:- Declare two objects called start time and end time for this class .

Step 4:- Create another object called changed object and display the changed time with the calculationStep 5:- In the main function create object for the class Date and display the time and date

accordingly.


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SOURCE CODE

import java.util.Date;

import java.text.ParseException;

import java.text.SimpleDateFormat;

public class DateExample {

private static void DateExample() {

Date date = new Date();

System.out.println("Current Date and Time is : " + date);


System.out.println("Date object showing specific date and time");

Date particulardate1 = new Date(2000,3,12);

Date particulardate2 = new Date(2000,4,12,9,10);


System.out.println("First Particular date : " + particulardate1);

System.out.println("Second Particular date: " + particulardate2);


System.out.println("Demo of getTime() method returning milliseconds");


Date strtime = new Date();

System.out.println("Start Time: " + strtime);

Date endtime = new Date();

System.out.println("End Time is: " + endtime);

long elapsed_time = endtime.getTime() - strtime.getTime();

System.out.println("Elapsed Time is:" + elapsed_time + "milliseconds");


System.out.println("Changed date object using setTime() method");


Date chngdate = new Date();

System.out.println("Date before change is: " + chngdate);

chngdate.setHours(12);

System.out.println("Now the Changed date is: " + chngdate);


}


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public static void main(String[] args) {


DateExample();

}

}

OUTPUT

D:\java>java DateExample

Current Date and Time is : Thu May 05 09:56:18 IST 2011

Date object showing specific date and time

First Particular date : Thu Apr 12 00:00:00 IST 3900

Second Particular date: Sat May 12 09:10:00 IST 3900

Demo of getTime() method returning milliseconds

Start Time: Thu May 05 09:56:18 IST 2011

End Time is: Thu May 05 09:56:18 IST 2011

Elapsed Time is:0 milliseconds

Changed date object using setHours() method

Date before change is: Thu May 05 09:56:18 IST 2011

Now the Changed date is: Thu May 05 12:56:18 IST 2011

ResultThus the above program was executed and verified successfully.


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3.Implement Lisp-like list in Java.

Aim:

To Implement basic operations such as 'car', 'cdr', and 'cons' using Lisp-like list in Java. If L is a list

[3, 0, 2, 5], L.car() returns 3, while L.cdr() returns [0,2,5]

Procedure:


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Program:

import java.util.ArrayList;

import java.util.Arrays;

import java.util.Collections;

import java.util.List;

import java.util.StringTokenizer;

import java.util.logging.Logger;

public class LispCommands {

private String[] tokenList;

private static Logger LOGGER = Logger.getLogger(LispCommands.class.getName());

public LispCommands() {

}

private void car() {

LOGGER.info(tokenList[0]);

}

private void cdr() {

List list = Arrays.asList(tokenList);

ArrayList slist = new ArrayList(list);

slist.remove(0);

display(slist);

}

private void cons(String args) {

List arrayList = new ArrayList(Arrays.asList(tokenList));

arrayList.add(args);

Collections.reverse(arrayList);

display(arrayList);


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}

private void parse(String args) {

ArrayList tokenList = new ArrayList();

if(args != null){

StringTokenizer tokens = new StringTokenizer(args,"[]");

while (tokens.hasMoreElements()) {

StringTokenizer commaTokens = new StringTokenizer(tokens.nextToken(),",");

while (commaTokens.hasMoreElements()) {

String token = commaTokens.nextToken();

if(token != null && !token.trim().equals("")){

tokenList.add(token.trim());

}

}

}

}

this.tokenList = tokenList.toArray(new String[0]);

}

private void display(Object result) {


if(result instanceof String){

LOGGER.info(result.toString());

} else if(result.getClass().getName().equals("java.util.ArrayList")){

LOGGER.info(result.toString());

}

}

public static void main(String[] args) {

LispCommands L = new LispCommands();

L.parse("[3, 0, 2, 5]");

L.car();


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L.cdr();

L.cons("7");

}}

Output:

Result:Thus the above program was executed and verified successfully


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Ex.No:4 Implementation of Stack ADT

AIM

To write a Java Program to design an interface for Stack ADT.and implement Stack ADTusing both Array and Linked List.

Procedure:


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Program:

public class ADTArray implements ADTStack{

Object[] array;int index;

public ADTArray() {this.array = new Object[128];

this.index = 0;}

//@Overridepublic Object pop() {

index--;

return array[index];}

//@Overridepublic void push(Object item) {

array[index] = item;index++;

}

public static void main(String[] args) {ADTStack stack = new ADTArray();stack.push("Hi");stack.push(new Integer(100));

System.out.println(stack.pop());System.out.println(stack.pop());

}

}

public class ADTList implements ADTStack {

private StackElement top;private int count = 0;

public void push(Object obj) {StackElement stackElement = new StackElement(obj);stackElement.next = top;

top = stackElement;count++;


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}

//@Overridepublic Object pop() {

if (top == null) return null;

Object obj = top.value;top = top.next;count--;return obj;

}

class StackElement {Object value;StackElement next;

public StackElement(Object obj) {

value = obj;next = null;

}}

public static void main(String[] args) {ADTStack stack = new ADTList();stack.push("Hi");stack.push(new Integer(100));

System.out.println(stack.pop());System.out.println(stack.pop());

}

}

public interface ADTStack {public void push (Object item);public Object pop ();

}


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Output:-

C:\>java ADTArray100Hi

C:\>java ADTList100Hi

C:\>java ADTStackException in thread main java.lang.NoSuchMethodError:main

Result:Thus the above program was executed and verified successfully.


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Ex no: 5 Polymorphism

Aim:-

To develop a vehicle class hierarchy in Java to demonstrate the concept of polymorphism.

Algorithm:-

Step 1:-Declare a super class called vehicle with data elements doors,wheels and seats.

Step 2:-Derive another class called car and invoke a function tostring() to display the variables.

Step 3:-Derive another class called motorcycle with same data and method called setseats() .

Step 4:-Declare another sub class called Truck with 2 constructors and finally assign values to

variables.

Step 5:-In the main function, create an object for class motorcycle and display all details of sub classes

through object.


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Sourcecode:-

//This is the class that will be inherited

public class Vehicle

{

public int doors;

public int seats;

public int wheels;

Vehicle()

{

wheels=4;

doors=4;

seats=4;

}

}

//This class inherits Vehicle.java

public class Car extends Vehicle

{

public String toString()

{

return "This car has "+seats+" Seats, "+doors+" Doors "+

"and "+wheels+" wheels.";

}

}


public class MotorCycle extends Vehicle

{

MotorCycle()

{

wheels=2;

doors=0;

seats=1;

}


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void setSeats(int num)

{

seats=num;

}


{

return "This motorcycle has "+seats+" Seats, "+doors+" Doors "+

"and "+wheels+" wheels.";

}

}


public class Truck extends Vehicle

{

boolean isPickup;

Truck()

{

isPickup=true;

}

Truck(boolean aPickup)

{

this();

isPickup=aPickup;

}

Truck(int doors, int seats, int inWheels, boolean isPickup)

{

this.doors=doors;

this.seats=seats;

wheels=inWheels;

this.isPickup=isPickup;

}


{

return "This "+(isPickup?"pickup":"truck")+

" has "+seats+" Seats, "+doors+" Doors "+"and "+wheels+" wheels.";


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}

}

//This class tests the classes that inherit Vehicle.java

public class VehiclesTest

{

public static void main(String args[])

{

MotorCycle mine = new MotorCycle();

System.out.println(mine);

Car mine2 = new Car();

System.out.println(mine2);

mine2.doors=2;


Truck mine3 = new Truck();


Truck mine4 = new Truck(false);

mine4.doors=2;


}

}


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Output

This motorcycle has 1 Seats, 0 Doors and 2 wheels

This car has 4 Seats, 4 Doors and 4 wheels

This car has 4 Seats, 2 Doors and 4 wheels

This pickup has 4 Seats, 4 Doors and 4 wheels

This truck has 4 Seats, 2 Doors and 4 wheels



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Ex No:-6 Object Serialization

Aim:-To write a Java Program to randomly generate objects and write them into a file using concept

of Object Serialization.

Algorithm:-

Step 1:Declare a class called Currency .Open a file in output mode with a name.

Step 2:-Write new data into the object using writeobject() method.

Step 3:-Similarly create an input stream object .Read it both in terms of Dollars and Rupees.close the

output object.

Step 4:-derive a class called Dollar which implements serializable interface.Invoke a constructor and

function to display the data.

Step 5:Similarly declare a class called Rupee with private variables and use print function to display

the variables.

Step 6: terminate the execution. The output is displayed as dollar to rupee conversion and vice versa.

Sourcecode:-

// Currency conversion

import java.io.*;

public class Currency

{


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public static void main(String args[])

{

Dollar dr=new Dollar('$',40);

dr.printDollar();

Rupee re=new Rupee("Rs.",50);

re.printRupee();

try

{

File f=new File("rd.txt");

FileOutputStream fos=new FileOutputStream(f);

ObjectOutputStream oos=new ObjectOutputStream(fos);

oos.writeObject(dr);

oos.writeObject(re);

oos.flush();

oos.close();

ObjectInputStream ois=new ObjectInputStream(new FileInputStream("rd.txt"));

Dollar d1;

d1=(Dollar)ois.readObject();

d1.printDollar();

Rupee r1;

r1=(Rupee)ois.readObject();

r1.printRupee();

ois.close();

}

catch(Exception e)

{

}

}

}

class Dollar implements Serializable

{

private float dol;

private char sym;


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public Dollar(char sm,float doll)

{

sym=sm;

dol=doll;

}

void printDollar()

{

System.out.print(sym);

System.out.println(dol);

}

}

class Rupee implements Serializable

{

private String sym;

private float rs;

public Rupee(String sm,float rup)

{

sym=sm;

rs=rup;

}

void printRupee()

{

System.out.print(sym);

System.out.println(rs);

}

}

Output:-


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E:\java>java Currency

$40.0

Rs.50.0

$40.0

Rs.50.0



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EX NO: 7 Scientific Calculator

AIM:

To design a scientific calculator using event-driven programming paradigm of Java.

ALGORITHM:

Step1: Define a class CalcFrame for creating a calculator frame and added windolistener to close the

calculator

Step2: create instance of object for View menu and various other objects

Step3: add a listener to receive item events when the state of an item changesStep4: Define the methods for all operations of stientific calculator

Step5::Get the input and display the result

PROGRAM

/** Scientific calculator*/

import java.awt.*;import java.awt.event.*;// class CalcFrame for creating a calculator frame and added windolistener to// close the calculator

class CalcFrame extends Frame {CalcFrame( String str) {// call to superclasssuper(str);// to close the calculator(Frame)

addWindowListener(new WindowAdapter() {

public void windowClosing (WindowEvent we) {System.exit(0);}

});}

}

// main class Calculator implemnets two// interfaces ActionListener// and ItemListener

public class Calculator implements ActionListener, ItemListener {// creating instances of objects


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CalcFrame fr;TextField display;Button key[] = new Button[20]; // creates a button object array of 20Button clearAll, clearEntry, round;Button scientificKey[] = new Button[10]; // creates a button array of 8

// declaring variablesboolean addButtonPressed, subtractButtonPressed, multiplyButtonPressed;boolean divideButtonPressed, decimalPointPressed, powerButtonPressed;boolean roundButtonPressed = false;double initialNumber;// the first number for the two number operationdouble currentNumber = 0; // the number shown in the screen while it is being pressedint decimalPlaces = 0;

// main functionpublic static void main (String args[]) {// constructor

Calculator calc = new Calculator();calc.makeCalculator();

}

public void makeCalculator() {// size of the buttonfinal int BWIDTH = 25;final int BHEIGHT = 25;int count =1;// create frame for the calculatorfr = new CalcFrame("Scientific Calculator");// set the sizefr.setSize(300,350);fr.setBackground(Color.blue);;fr.setLayout(null);// set the initial numbers that is 1 to 9

for (int row = 0; row < 3; ++row) {for (int col = 0; col < 3; ++col) {// this will set the key from 1 to 9key[count] = new Button(Integer.toString(count));key[count].addActionListener(this);

// set the boundry for the keyskey[count].setBounds(30*(col + 1), 30*(row + 4),BWIDTH,BHEIGHT);key[count].setBackground(Color.yellow);// add to the framefr.add(key[count++]);

}}

// Now create, addlistener and add to frame all other keys//0key[0] = new Button("0");

key[0].addActionListener(this);key[0].setBounds(30,210,BWIDTH,BHEIGHT);


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key[0].setBackground(Color.yellow);fr.add(key[0]);//decimalkey[10] = new Button(".");key[10].addActionListener(this);

key[10].setBounds(60,210,BWIDTH,BHEIGHT);key[10].setBackground(Color.yellow);fr.add(key[10]);//equals tokey[11] = new Button("=");key[11].addActionListener(this);key[11].setBounds(90,210,BWIDTH,BHEIGHT);key[11].setBackground(Color.yellow);fr.add(key[11]);//multiplykey[12] = new Button("*");

key[12].addActionListener(this);key[12].setBounds(120,120,BWIDTH,BHEIGHT);key[12].setBackground(Color.yellow);fr.add(key[12]);//dividekey[13] = new Button("/");key[13].addActionListener(this);key[13].setBounds(120,150,BWIDTH,BHEIGHT);key[13].setBackground(Color.yellow);fr.add(key[13]);//additionkey[14] = new Button("+");key[14].addActionListener(this);key[14].setBounds(120,180,BWIDTH,BHEIGHT);key[14].setBackground(Color.yellow);fr.add(key[14]);//subtractkey[15] = new Button("-");key[15].addActionListener(this);key[15].setBounds(120,210,BWIDTH,BHEIGHT);key[15].setBackground(Color.yellow);

fr.add(key[15]);//reciprocalkey[16] = new Button("1/x");key[16].addActionListener(this);key[16].setBounds(150,120,BWIDTH,BHEIGHT);key[16].setBackground(Color.yellow);fr.add(key[16]);//powerkey[17] = new Button("x^n");key[17].addActionListener(this);key[17].setBounds(150,150,BWIDTH,BHEIGHT);

key[17].setBackground(Color.yellow);fr.add(key[17]);


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//change signkey[18] = new Button("+/-");key[18].addActionListener(this);key[18].setBounds(150,180,BWIDTH,BHEIGHT);key[18].setBackground(Color.yellow);

fr.add(key[18]);//factorialkey[19] = new Button("x!");key[19].addActionListener(this);key[19].setBounds(150,210,BWIDTH,BHEIGHT);key[19].setBackground(Color.yellow);fr.add(key[19]);// CAclearAll = new Button("CA");clearAll.addActionListener(this);clearAll.setBounds(30, 240, BWIDTH+20, BHEIGHT);

clearAll.setBackground(Color.yellow);fr.add(clearAll);// CEclearEntry = new Button("CE");clearEntry.addActionListener(this);clearEntry.setBounds(80, 240, BWIDTH+20, BHEIGHT);clearEntry.setBackground(Color.yellow);fr.add(clearEntry);// roundround = new Button("Round");round.addActionListener(this);round.setBounds(130, 240, BWIDTH+20, BHEIGHT);round.setBackground(Color.yellow);fr.add(round);// set display areadisplay = new TextField("0");display.setBounds(30,90,150,20);display.setBackground(Color.white);

// key for scientific calculator

// SinescientificKey[0] = new Button("Sin");scientificKey[0].addActionListener(this);scientificKey[0].setBounds(180, 120, BWIDTH + 10, BHEIGHT);scientificKey[0].setVisible(true);scientificKey[0].setBackground(Color.yellow);fr.add(scientificKey[0]);// cosinescientificKey[1] = new Button("Cos");scientificKey[1].addActionListener(this);scientificKey[1].setBounds(180, 150, BWIDTH + 10, BHEIGHT);

scientificKey[1].setBackground(Color.yellow);scientificKey[1].setVisible(true);


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fr.add(scientificKey[1]);// TanscientificKey[2] = new Button("Tan");scientificKey[2].addActionListener(this);scientificKey[2].setBounds(180, 180, BWIDTH + 10, BHEIGHT);

scientificKey[2].setBackground(Color.yellow);scientificKey[2].setVisible(true);fr.add(scientificKey[2]);// PIscientificKey[3] = new Button("Pi");scientificKey[3].addActionListener(this);scientificKey[3].setBounds(180, 210, BWIDTH + 10, BHEIGHT);scientificKey[3].setBackground(Color.yellow);scientificKey[3].setVisible(true);fr.add(scientificKey[3]);// aSine

scientificKey[4] = new Button("aSin");scientificKey[4].addActionListener(this);scientificKey[4].setBounds(220, 120, BWIDTH + 10, BHEIGHT);scientificKey[4].setBackground(Color.yellow);scientificKey[4].setVisible(true);fr.add(scientificKey[4]);// aCosscientificKey[5] = new Button("aCos");scientificKey[5].addActionListener(this);scientificKey[5].setBounds(220, 150, BWIDTH + 10, BHEIGHT);scientificKey[5].setBackground(Color.yellow);scientificKey[5].setVisible(true);fr.add(scientificKey[5]);// aTanscientificKey[6] = new Button("aTan");scientificKey[6].addActionListener(this);scientificKey[6].setBounds(220, 180, BWIDTH + 10, BHEIGHT);scientificKey[6].setBackground(Color.yellow);scientificKey[6].setVisible(true);fr.add(scientificKey[6]);// E

scientificKey[7] = new Button("E");scientificKey[7].addActionListener(this);scientificKey[7].setBounds(220, 210, BWIDTH + 10, BHEIGHT);scientificKey[7].setBackground(Color.yellow);scientificKey[7].setVisible(true);fr.add(scientificKey[7]);// to degreesscientificKey[8] = new Button("todeg");scientificKey[8].addActionListener(this);scientificKey[8].setBounds(180, 240, BWIDTH + 10, BHEIGHT);scientificKey[8].setBackground(Color.yellow);

scientificKey[8].setVisible(true);fr.add(scientificKey[8]);


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// to radiansscientificKey[9] = new Button("torad");scientificKey[9].addActionListener(this);scientificKey[9].setBounds(220, 240, BWIDTH + 10, BHEIGHT);scientificKey[9].setBackground(Color.yellow);

scientificKey[9].setVisible(true);fr.add(scientificKey[9]);fr.add(display);fr.setVisible(true);

} // end of makeCalculator

public void actionPerformed(ActionEvent ae) {String buttonText = ae.getActionCommand();double displayNumber = Double.valueOf(display.getText()).doubleValue();// if the button pressed text is 0 to 9

if((buttonText.charAt(0) >= '0') & (buttonText.charAt(0)


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// if button pressed is subtractif (buttonText == "-") {subtractButtonPressed = true;initialNumber = displayNumber;

currentNumber = 0;decimalPointPressed = false;

}

// if button pressed is divideif (buttonText == "/") {divideButtonPressed = true;initialNumber = displayNumber;currentNumber = 0;decimalPointPressed = false;

}

// if button pressed is multiplyif (buttonText == "*") {multiplyButtonPressed = true;initialNumber = displayNumber;currentNumber = 0;decimalPointPressed = false;

}

// if button pressed is reciprocalif (buttonText == "1/x") {// call reciprocal methoddisplay.setText(reciprocal(displayNumber));currentNumber = 0;decimalPointPressed = false;

}

// if button is pressed to change a sign//

if (buttonText == "+/-") {// call changesign meyhod to change the

// signdisplay.setText(changeSign(displayNumber));currentNumber = 0;decimalPointPressed = false;

}

// factorial buttonif (buttonText == "x!") {display.setText(factorial(displayNumber));currentNumber = 0;decimalPointPressed = false;

}


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// power buttonif (buttonText == "x^n") {

powerButtonPressed = true;initialNumber = displayNumber;currentNumber = 0;

decimalPointPressed = false;}

// now for scientific buttonsif (buttonText == "Sin") {

display.setText(Double.toString(Math.sin(displayNumber)));currentNumber = 0;decimalPointPressed = false;

}

if (buttonText == "Cos") {

display.setText(Double.toString(Math.cos(displayNumber)));currentNumber = 0;decimalPointPressed = false;

}

if (buttonText == "Tan") {display.setText(Double.toString(Math.tan(displayNumber)));currentNumber = 0;decimalPointPressed = false;

}

if (buttonText == "aSin") {display.setText(Double.toString(Math.asin(displayNumber)));currentNumber = 0;decimalPointPressed = false;

}

if (buttonText == "aCos") {display.setText(Double.toString(Math.acos(displayNumber)));currentNumber = 0;decimalPointPressed = false;

}

if (buttonText == "aTan") {display.setText(Double.toString(Math.atan(displayNumber)));currentNumber = 0;decimalPointPressed = false;

}

// this will convert the numbers displayed to degreesif (buttonText == "todeg")display.setText(Double.toString(Math.toDegrees(displayNumber)));

// this will convert the numbers display// ed to radians


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if (buttonText == "torad")display.setText(Double.toString(Math.toRadians(displayNumber)));

if (buttonText == "Pi") {display.setText(Double.toString(Math.PI));

currentNumber =0;decimalPointPressed = false;

}

if (buttonText == "Round")roundButtonPressed = true;// check if decimal point is pressed

if (buttonText == ".") {String displayedNumber = display.getText();

boolean decimalPointFound = false;

int i;decimalPointPressed = true;// check for decimal point

for (i =0; i < displayedNumber.length(); ++i) {

if(displayedNumber.charAt(i) == '.') {decimalPointFound = true;continue;

}}

if (!decimalPointFound)decimalPlaces = 1;

}

if(buttonText == "CA"){// set all buttons to falseresetAllButtons();display.setText("0");

currentNumber = 0;}

if (buttonText == "CE") {display.setText("0");currentNumber = 0;decimalPointPressed = false;

}

if (buttonText == "E") {display.setText(Double.toString(Math.E));

currentNumber = 0;decimalPointPressed = false;


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}

// the main actionif (buttonText == "=") {currentNumber = 0;

// if add button is pressedif(addButtonPressed)display.setText(Double.toString(initialNumber + displayNumber));// if subtract button is pressedif(subtractButtonPressed)display.setText(Double.toString(initialNumber - displayNumber));// if divide button is pressed

if (divideButtonPressed) {// check if the divisor is zero

if(displayNumber == 0) {MessageBox mb = new MessageBox ( fr, "Error ", true, "Cannot divide by

zero.");mb.show();

}elsedisplay.setText(Double.toString(initialNumber/displayNumber));

}

// if multiply button is pressedif(multiplyButtonPressed)display.setText(Double.toString(initialNumber * displayNumber));// if power button is pressedif (powerButtonPressed)display.setText(power(initialNumber, displayNumber));// set all the buttons to falseresetAllButtons();

}} // end of action events

public void itemStateChanged(ItemEvent ie){} // end of itemState

// this method will reset all the button// Pressed property to falsepublic void resetAllButtons() {

addButtonPressed = false;subtractButtonPressed = false;multiplyButtonPressed = false;divideButtonPressed = false;decimalPointPressed = false;

powerButtonPressed = false;roundButtonPressed = false;

}


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public String factorial(double num) {int theNum = (int)num;

if (theNum < 1) {MessageBox mb = new MessageBox (fr, "Facorial Error", true,"Cannot find the factorial of numbers less than 1.");

mb.show();return ("0");

}else {for (int i=(theNum -1); i > 1; --i)theNum *= i;return Integer.toString(theNum);

}

}

public String reciprocal(double num) {if (num ==0) {MessageBox mb = new MessageBox(fr,"Reciprocal Error", true,"Cannot find the reciprocal of 0");mb.show();

}elsenum = 1/num;return Double.toString(num);

}public String power (double base, double index) {return Double.toString(Math.pow(base, index));

}public String changeSign(double num) {return Double.toString(-num);

}}

class MessageBox extends Dialog implements ActionListener {Button ok;

MessageBox(Frame f, String title, boolean mode, String message) {

super(f, title, mode);Panel centrePanel = new Panel();Label lbl = new Label(message);centrePanel.add(lbl);add(centrePanel, "Center");Panel southPanel = new Panel();ok = new Button ("OK");ok.addActionListener(this);southPanel.add(ok);add(southPanel, "South");

pack();

addWindowListener (new WindowAdapter() {public void windowClosing (WindowEvent we) {


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System.exit(0);}

});}

public void actionPerformed(ActionEvent ae) {dispose();

}}

OUTPUT:

RESULT:

Thus a scientific calculator using even-driven programming paradigm of Java isdeveloped.


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EX NO:-8 Multithreading

Aim:-

To write a multi-threaded Java program to print all numbers below 100,000 that are both prime

and Fibonacci number (some examples are 2, 3, 5, 13, etc.). Design a thread that generates prime

numbers below 100,000 and writes them into a pipe. Design another thread that generates fibonacci

numbers and writes them to another pipe.The main thread should read both the pipes to identify

numbers common to both.

Procedure:


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Program:

import java.io.IOException;

import java.io.PipedWriter;

public class FibonacciGenerator extends Thread {

private PipedWriter fibWriter = new PipedWriter();

public PipedWriter getPipedWriter() {return fibWriter;

}

@Overridepublic void run() {

super.run();generateFibonacci();

}

private int f(int n) {if (n < 2) {

return n;}else {

return f(n-1)+ f(n-2);}

}

public void generateFibonacci() {

/*do {fibValue = f(i);

System.out.println("From Fibo : " + fibValue);try {

fibWriter.write(fibValue);

} catch (IOException e) {e.printStackTrace();

}

i++;} while(fibValue < 10000);*/for (int i = 2, fibValue = 0; (fibValue = f(i)) < 10000; i++) {

//System.out.println("From Fibo : " + fibValue);try {

fibWriter.write(fibValue);

} catch (IOException e) {// TODO Auto-generated catch block


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e.printStackTrace();}

}//suspend();

}

public static void main(String[] args) {new FibonacciGenerator().generateFibonacci();

}}

import java.io.IOException;import java.io.PipedReader;

class Receiver extends Thread {

private PipedReader fibReader;private PipedReader primeReader;

public Receiver(FibonacciGenerator f ib, PrimeGenerator prime)throws IOException {

fibReader = new PipedReader(fib.getPipedWriter());primeReader = new PipedReader(prime.getPipedWriter());

}

public void run() {

int prime = 0;int fib = 0;try {

prime = primeReader.read();fib = fibReader.read();

} catch (IOException e1) {// TODO Auto-generated catch blocke1.printStackTrace();

}while (true) {

//System.out.println("FROM PRIME PIPE ::" + prime);//System.out.println("FROM FIB PIPE::" + fib);try {

if (prime == fib) {System.out.println("MATCH ::" + prime);prime = primeReader.read();fib = fibReader.read();

} else if (fib < prime) {fib = fibReader.read();

} else {

prime = primeReader.read();}} catch (IOException e) {


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System.exit(-1);}

}

}}

import java.io.IOException;import java.io.PipedWriter;

public class PrimeGenerator extends Thread {

private PipedWriter primeWriter = new PipedWriter();

public PipedWriter getPipedWriter() {return primeWriter;

}

@Overridepublic void run() {

super.run();generatePrime();

}

public void generatePrime() {for (int i = 2; i < 10000; i++) {

if (isPrime(i)) {try {

//System.out.println("From Prime : " + i);primeWriter.write(i);

} catch (IOException e) {e.printStackTrace();

}}

}//suspend();

}

private boolean isPrime(int n) {boolean prime = true;

int sqrtValue = (int) Math.sqrt(n);

for (int i = 2; i


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return prime;}

public static void main(String[] args) throws IOException {PrimeGenerator gene = new PrimeGenerator();gene.generatePrime();

}

}

import java.io.IOException;

public class Main {

/*** @param args* @throws IOException*/public static void main(String[] args) throws IOException {

FibonacciGenerator f ibonacciGenerator = new FibonacciGenerator();PrimeGenerator primeGenerator = new PrimeGenerator();

Receiver receiver = new Receiver(fibonacciGenerator, primeGenerator);

fibonacciGenerator.start();primeGenerator.start();receiver.start();

/*fibonacciGenerator.stop();primeGenerator.stop();receiver.stop();*/

//fibonacciGenerator.run();}

}

Output:C:\jdk1.5\bin>javac FibonacciGenerator.java

C:\jdk1.5\bin>javac PrimeGenerator.java

C:\jdk1.5\bin>javac Receiver.java

C:\jdk1.5\bin>javac Main.java


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MATCH ::2MATCH ::3MATCH ::5MATCH ::13MATCH ::89

MATCH ::233MATCH ::1597

C:\jdk1.5\bin>



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Ex.No: 9 A Simple OPAC system for library

Aim:-

To develop a simple OPAC System for library management system using event-driven andconcurrent programming paradigms and java database connectivity.

Algorithm:-

Step 1:Initiate a class and declare the driver for the Driver name required to connect to the database.

Step 2:-Enclose the coding in a try block to handle errors and trap the exception in a catch block.

Step 3:-Establish the connection object to connect to the backend.

Step 4:-Create an object for Statement object using createStatement() object.

Step 5:-Issue a query through executeQuery() method.

Program

import java.sql.*;import java.awt.*;import java.awt.event.*;import javax.swing.*;

public class Datas extends JFrame implements ActionListener {

JTextField id;JTextField name;JButton next;JButton addnew;JPanel p;static ResultSet res;static Connection conn;static Statement stat;

public Datas()


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{

super("Our Application");Container c = getContentPane();c.setLayout(new GridLayout(5,1));

id = new JTextField(20);name = new JTextField(20);next = new JButton("Next BOOK");

p = new JPanel();c.add(new JLabel("ISBN",JLabel.CENTER));c.add(id);

c.add(new JLabel("Book Name",JLabel.CENTER));c.add(name);c.add(p);

p.add(next);next.addActionListener(this);

pack();setVisible(true);addWindowListener(new WIN());

}

public static void main(String args[]) {Datas d = new Datas();try {Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");conn = DriverManager.getConnection("jdbc:odbc:custo"); // cust is the DSN Namestat = conn.createStatement();res = stat.executeQuery("Select * from stu"); // Customers is the table name

res.next();

}catch(Exception e) {System.out.println("Error" +e);}d.showRecord(res);}

public void actionPerformed(ActionEvent e) {if(e.getSource() == next) {try {res.next();}catch(Exception ee) {}showRecord(res);}}

public void showRecord(ResultSet res) {try {


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id.setText(res.getString(2));name.setText(res.getString(3));}catch(Exception e) {}

}//end of the main

//Inner class WIN implementedclass WIN extends WindowAdapter {public void windowClosing(WindowEvent w) {

JOptionPane jop = new JOptionPane();jop.showMessageDialog(null,"Database","Thanks",JOptionPane.QUESTION_MESSAGE);

}

} } //end of the class

Output:


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Concurrent

import java.sql.*;import java.sql.DriverManager.*;class Ja

{String bookid,bookname;int booksno;Connection con;Statement stmt;ResultSet rs;Ja(){

try{

Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");

con=DriverManager.getConnection("jdbc:odbc:co");}catch(Exception e){System.out.println("connection error");}

}

void myput(){

try{

stmt=con.createStatement();rs=stmt.executeQuery("SELECT * FROM opac");while(rs.next()){

booksno=rs.getInt(1);bookid=rs.getString(2);bookname=rs.getString(3);System.out.println("\n"+ booksno+"\t"+bookid+"\t"+bookname);

}

rs.close();stmt.close();con.close();

}catch(SQLException e){

System.out.println("sql error");}

}}class prog1

{public static void main(String arg[])


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{Ja j=new Ja();

j.myput();}}

Output:

Result:

Thus the above program was executed and verified successfully.


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Ex.No: 10 Multi-threaded echo server GUI clients

Aim:-To develop a Java Program that supports multithreaded echo server and a GUI client.

Procedure:

Program:

/**************PROGRAM FOR MULTI-THREADED ECHO SERVER********************//******************************* chatclient .java**********************************/

import java.awt.*;import java.awt.event.*;import java.io.*; import java.net.*;class chatclient extends Frame implements ActionListener,Runnable

{TextArea ta;TextField tf;BufferedReader br;PrintWriter pw;

public static void main(String args[]){


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chatclient cc=new chatclient("ChatClient",args[0],4040);cc.show();cc.setSize(300,400);

}chatclient(String title,String address,int port)

{super(title);

addWindowListener(new WindowAdapter(){

public void windowClosing(WindowEvent we){

System.exit(0);}

});ta=new TextArea(10,60);

ta.setEditable(false);add(ta,BorderLayout.CENTER);tf=new TextField(" ",10);tf.addActionListener(this);add(tf,BorderLayout.SOUTH);

try{

Socket s=new Socket(address,port);InputStream is=s.getInputStream();InputStreamReader isr=new InputStreamReader(is);br=new BufferedReader(isr);OutputStream os=s.getOutputStream();

pw=new PrintWriter(os,true);}catch(Exception e){

System.out.println(e);}

Thread thread=new Thread(this);thread.start();

}public void actionPerformed(ActionEvent ae){try { String str=tf.getText();

pw.println(str); tf.setText(" ");}catch(Exception e){System.out.println(e);}

}

public void run(){


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try{while(true)

{String str=br.readLine();

ta.append(str+"\n");}

}catch(Exception e){System.out.println(e);

}}}

/*************************** chatserver.java***********************************/import java.net.*;import java.util.*;class chatserver{

static Vector serverthreads;public static void main(String args[]){try{serverthreads=new Vector();

ServerSocket ss=new ServerSocket(4040);while(true)

{

Socket s=ss.accept();serverthread st=new serverthread(s);st.start();

serverthreads.addElement(st);}}catch(Exception e)

{System.out.println(e);}}

public synchronized static void echoAll(String str){


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Enumeration e=serverthreads.elements();while(e.hasMoreElements()){

try{

serverthread st=(serverthread)e.nextElement();st.echo(str);}catch(Exception ae){

System.out.println(ae);}}}}

/****************************** serverthread.java*********************************/import java.io.*;

import java.net.*;class serverthread extends Thread{private BufferedReader br;private PrintWriter pw;public serverthread(Socket socket){try{

InputStream is=socket.getInputStream();InputStreamReader isr=new InputStreamReader(is);br=new BufferedReader(isr); OutputStream os=socket.getOutputStream();

pw=new PrintWriter(os,true);}catch(Exception e){

System.out.println(e);}}public void run(){try{

while(true){


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MiniProject

Aim:

To Develop a programmer's editor in Java that supports syntax highlighting,

compilation support, debugging support, etc

Program:

/*********************** PROGAMMERS EDITOR IN JAVA************************/ /*

Client Frame Design with width=600 & height=500*/import java.awt.Color;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;

import java.awt.event.MouseEvent;import java.awt.event.MouseListener;

import java.awt.event.MouseMotionListener;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import java.awt.event.WindowListener;

import java.io.BufferedReader;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.FileReader;

import java.io.InputStreamReader;import javax.swing.*;

import javax.swing.border.Border;import javax.swing.text.Element;import java.util.StringTokenizer;

public class Client implements ActionListener,MouseListener,MouseMotionListener{

/************ Components *****************/JFrame frame;JTextArea jta1;

public JTextArea jta2;JTextArea jta3;JButton jb1;

JButton jb2;JButton jb3;JButton jb4;

JLabel jl1;JLabel jl2;

JLabel jl3;JScrollPane jsp1;JScrollPane jsp2;JScrollPane jsp3;

JTabbedPane jtp1;JTabbedPane jtp2;JTabbedPane jtp3;JMenuBar jm;JMenu open;


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JMenu exit;JMenu file;JMenu help;JMenu compile;JMenu run;

JMenu opt;/************ Variables *****************/String line;String option;String className;String pureFile;File f2;File f3;

public Client(){frame=new JFrame("XDoS Compiler");frame.setLayout(null);frame.setBounds(300,10,200,200);frame.setSize(900,650);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);jta1=new JTextArea(300,400);

jsp1=new JScrollPane(jta1);jsp1.setBounds(10, 10, 670, 200);jsp1.setEnabled(false);Border etchedBdr1 = BorderFactory.createEtchedBorder();jta1.setBorder(etchedBdr1); //frame.add(jsp1);jta2=new JTextArea(300,400);jsp2=new JScrollPane(jta2);

jsp2.setBounds(10, 280, 670, 150);Border etchedBdr2 = BorderFactory.createEtchedBorder();

jta2.setBorder(etchedBdr2);jta2.setEditable(false);//frame.add(jsp2);

jta3=new JTextArea(300,400);jsp3=new JScrollPane(jta3);jsp3.setBounds(10, 450, 670, 150);Border etchedBdr3 = BorderFactory.createEtchedBorder();

jta3.setBorder(etchedBdr3);//frame.add(jsp3);

jl1=new JLabel();jl1.setBounds(500, 380, 670, 150);frame.add(jl1);jl2=new JLabel();

jl2.setBounds(550, 380, 670, 150);frame.add(jl2);

jl3=new JLabel();jl3.setBounds(600, 380, 670, 150);frame.add(jl3);

jb1=new JButton("Browse");jb1.setBounds(50, 235, 100, 20);

jb1.addActionListener(this);//frame.add(jb1);


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jb2=new JButton("compile");jb2.setBounds(200, 235, 100, 20);jb2.addActionListener(this);//frame.add(jb2); jb3=new JButton("Send");

jb3.setBounds(550, 235, 100, 20);

jb3.addActionListener(this);//frame.add(jb3);jb4=new JButton("Run");jb4.setBounds(400, 235, 100, 20);jb4.addActionListener(this);//frame.add(jb4);

jtp1=new JTabbedPane();jtp1.addTab( "untitled.java", jsp1 );jtp1.setBounds(10, 40, 670, 400);UIManager.put("TabbedPane.selected", Color.green);

jtp1.set ForegroundAt(0,Color.BLUE);jtp1.setBackgroundAt(0,Color.BLUE);frame.add(jtp1); jtp2=new JTabbedPane();

jtp2.addTab( "Result", jsp2 );jtp2.setBounds(10, 450, 670, 150);frame.add(jtp2); jtp3=new JTabbedPane();

jtp3.addTab( "Reply", jsp3 );jtp3.setBounds(700, 40, 180, 560);frame.add(jtp3); jm=new JMenuBar();file=new JMenu("File");

file.setMnemonic('F');opt=new JMenu("Option");opt.setMnemonic('O');

opt.setEnabled(false);jm.add(file);

jm.add(opt);compile=new JMenu("Compile");

compile.setMnemonic('C');Action action3 = new AbstractAction("Compile"){

public void actionPerformed(ActionEvent e){compile();

}};JMenuItem item3 = file.add(action3);opt.add(item3);run=new JMenu("Run");run.setMnemonic('R');Action action4 = new AbstractAction("Run"){public void actionPerformed(ActionEvent e){run();

}};


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JMenuItem item4 = file.add(action4);opt.add(item4); help=new JMenu("Help");

jm.add(help); open=new JMenu("open");Action action1 = new AbstractAction("Open"){

public void actionPerformed(ActionEvent e){ open(); } };JMenuItem item1 = file.add(action1);file.add(item1); exit=new JMenu("Exit");

Action action2 = new AbstractAction("Exit"){

public void actionPerformed(ActionEvent e){System.exit(0); } };JMenuItem item2 = file.add(action2);

file.add(item2);jm.setBounds(5, 0, 880, 30);frame.add(jm);frame.setResizable(false);frame.setVisible(true);

jta1.addMouseListener(this);jta1.addMouseMotionListener(this);

jtp1.addMouseListener(this); jtp2.addMouseListener(this);}public void mouseClicked(MouseEvent ew){

if(ew.getSource()==jta1){

jl3.setText("Line-No: "+Integer.toString(getCurrentLineNumber()));}else if(ew.getSource()==jtp2){if(jtp1.isShowing()){

frame.remove(jtp1);jtp2.setBounds(10, 40, 670, 560);

jl1.setBounds(500, 535, 670, 150);

jl2.setBounds(550, 535, 670, 150);jl3.setBounds(600, 535, 670, 150);jta2.addMouseMotionListener(this);

jl3.setText("Line-No: "+Integer.toString(getCurrentLineNumber()));}

else { frame.add(jtp1);jtp2.setBounds(10, 450, 670, 150);

jl1.setBounds(500, 380, 670, 150);jl2.setBounds(550, 380, 670, 150);jl3.setBounds(600, 380, 670, 150);

jta2.removeMouseMotionListener(this);

} }else if(ew.getSource()==jtp1)


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{if(jtp2.isShowing()){ frame.remove(jtp2);frame.remove(jtp3); jtp1.setBounds(10, 40, 870, 560);

jl1.setBounds(500, 535, 670, 150);

jl2.setBounds(550, 535, 670, 150);jl3.setBounds(600, 535, 670, 150);

}else { frame.add(jtp2); frame.add(jtp3);

jtp1.setBounds(10, 40, 670, 400);jl1.setBounds(500, 380, 670, 150);jl2.setBounds(550, 380, 670, 150);

jl3.setBounds(600, 380, 670, 150); } } }public void mouseEntered(MouseEvent ew){} public void mouseExited(MouseEvent ew) {}

public void mousePressed(MouseEvent ew) {}public void mouseReleased(MouseEvent ew) {}

public void mouseMoved(MouseEvent e){ jl1.setText("X-: "+Integer.toString(e.getX()));jl2.setText("Y-: "+Integer.toString(e.getY())); }public void mouseDragged(MouseEvent e) {}public void actionPerformed(ActionEvent ae) {}public void open(){JFileChooser fileChooser = new JFileChooser();

fileChooser.addChoosableFileFilter(new MyFilter());int select=fileChooser.showOpenDialog(frame);

if(select==JFileChooser.APPROVE_OPTION) {File file=fileChooser.getSelectedFile();String filename=fileChooser.getSelectedFile().getName();

try { FileInputStream fis=new FileInputStream(file);int n=fis.available(); byte dat[]=new byte[n];fis.read(dat); String data=new String(dat);jtp1.setTitleAt(0, filename);jta1.setText(data); opt.setEnabled(true); }catch(Exception e){ e.printStackTrace(); } }

}public int getCurrentLineNumber()

{int line;int caretPosition = jta1.getCaretPosition();Element root = jta1.getDocument().getDefaultRootElement();line = root.getElementIndex(caretPosition) + 1; return line;

}public void compile() { try { jtp2.setTitleAt(0,"Compile");

String ta1=jta1.getText().trim();StringBuffer sb=new StringBuffer(ta1);

int id1=ta1.indexOf("public class");int id2=ta1.indexOf(" ",id1+13);


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String name=ta1.substring(id1, id2).trim();StringTokenizer st3=new StringTokenizer(name,"\n");System.out.println(st3.countTokens());

String word=st3.nextToken().toString().trim(); System.out.println(word+"*");StringTokenizer st4=new StringTokenizer(word," "); System.out.println(st4.countTokens());

st4.nextToken(); st4.nextToken();pureFile=st4.nextToken().toString().trim();className=pureFile+".java"; //System.out.println(st4.nextElement().toString().trim()+"*");FileOutputStream f=new FileOutputStream(className);f.write(ta1.getBytes());

f.close();f2=new File(className); f3=new File(pureFile+".class");System.out.println(f2.getAbsolutePath());

String path=f2.getAbsolutePath(); int a1=path.indexOf("\\");int a2=path.lastIndexOf("\\");System.out.println(a1+" "+a2);

String colan=path.substring(0, a1).trim();String location=path.substring(0, a2+1).trim();System.out.println(colan);System.out.println(location);

compiler(className); }

catch (Exception err){ err.printStackTrace();

} //option=JOptionPane.showInputDialog(null,"Enter Destination SystemName","Destination",1).toString(); //System.out.println(option); // jta2.setText(line); }

public void run() { jtp2.setTitleAt(0,"Run");runer(pureFile); }public static void main(String args[]){try

{UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");}

catch (Exception e) { } new Client(); }public void compiler(String name){ try { jta2.setText("");

jta2.append("Compilation Started.....\n");jta2.append("Proceed.....\n");jta2.setForeground(Color.blue);String callAndArgs= "cmd /c compile.bat "+name; Process p =Runtime.getRuntime().exec(callAndArgs);

BufferedReader br=new BufferedReader(new InputStreamReader(p.getInputStream()));String str=br.readLine();while(str!=null){

System.out.println(str);str=br.readLine(); }File f1 = new File("error.txt");

FileReader fr = new FileReader(f1);BufferedReader br1 = new BufferedReader(fr);


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StringBuffer sb1 = new StringBuffer();String eachLine = br1.readLine();

while (eachLine != null){

jta2.setForeground(Color.RED);

sb1.append(eachLine);sb1.append("\n");eachLine= br1.readLine(); }jta2.append(sb1.toString());//input.close(); if(f1.length()==0){

jta2.append("Compiled Successfully........\n");jta2.append("Done........"); } } catch(Exception e){ e.printStackTrace(); } }

public void runer(String name){try { jta3.setText("");

String callAndArgs= "cmd /c run.bat "+name;Process p =Runtime.getRuntime().exec(callAndArgs);BufferedReader br=new BufferedReader(new InputStreamReader(p.getInputStream())); Stringstr=br.readLine(); while(str!=null){

System.out.println(str); str=br.readLine();}File f1 = new File("output.txt");FileReader fr = new FileReader(f1);BufferedReader br1 = new BufferedReader(fr);StringBuffer sb1 = new StringBuffer();

String eachLine = br1.readLine();while (eachLine != null)

{sb1.append(eachLine);sb1.append("\n");

eachLine = br1.readLine();}String sp=sb1.toString();StringBuffer st=new StringBuffer(sp);System.out.println(st.length()); int indx=sp.indexOf(">"); int r=1;

while(indx != -1){System.out.println(Integer.toString(indx)+"*");

System.out.println(st);st.insert(indx+r, "\n");indx=sp.indexOf(">",indx+1);r++;

System.out.println(Integer.toString(indx)+"#");}

jta2.setText(st.toString()); f2.deleteOnExit();f3.deleteOnExit(); }

catch(Exception e){ e.printStackTrace(); } } }


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class MyFilter extends javax.swing.filechooser.FileFilter{public boolean accept(File file){return file.isDirectory() || file.getName().endsWith(".java");

}public String getDescription(){ return "*.java"; } }

/* Test Frame Design */import javax.swing.*;import java.awt.*;

public class Test {public Test() { JFrame f = new JFrame("Test");f.setLayout(new FlowLayout());

JTextField jt1 = new JTextField(25);f.add(jt1); f.setVisible(true);f.setSize(200,200);

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);}

public static void main(String args[]){new Test();}}

OUTPUT:

D:\ Java\jdk1.5.0_03\bin>javac Client.javaD:\ Java\jdk1.5.0_03\bin>javac Test.javaD:\ Java\jdk1.5.0_03\bin>java TestD:\ Java\jdk1.5.0_03\bin>java Client


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