Java Lab 2-1 Manual It & Cse2009-10

7/29/2019 Java Lab 2-1 Manual It & Cse2009-10

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OOPS Lab through JAVA, CSE & CSIT Depts.

1. Write a Java program to find the Quardratic roots of the equation ax2+bx+c=0.

import java.io.*;class Factors

{

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

{BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

System.out.println("enter a,b,c values");int a=Integer.parseInt(br.readLine());

int b=Integer.parseInt(br.readLine());

int c=Integer.parseInt(br.readLine());

int f=((b*b)-(4*a*c));if(f>0)

{

double d=(((-b)+Math.sqrt(f))/(2*a));double e=(((-b)-Math.sqrt(f))/(2*a));

System.out.println(roots are:);System.out.println("root1="+d+"\t"+root2=+e);

System.out.println("roots are real");

}else if(f==0)

{

System.out.println("roots are equal");

}else

{

System.out.println("roots are imaginary");}

}

}

Output:

Enter a,b,c Values

25

2

roots are :

root1=-0.5 root2=-2.0roots are real

SVEC, Suryapet

1


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2. Write a Java program to print Fibonacii series upto given number.

import java.io.*;

public class Fib

{

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

BufferedReader br=new BufferedReader(new InputStreamReader(System.in));int f0=0,f1=1,fib=1;

System.out.println("Enter n value");

int n=Integer.parseInt(br.readLine());

System.out.println("Fibonacii series is:");System.out.println(f0);

System.out.println(f1);

for(int i=0;i


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3. Write a Java program to print prime numbers in a given range.

import java.util.*;

class Prime

{

public static void main(String args[]){

int i,j;Scanner br =new Scanner(System.in);

System.out.println("Enter the starting range");

int s=br.nextInt();

System.out.println("Enter the end range");int e=br.nextInt();

for(i=s;i


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4. Write a Java program to find the total and average of a student marks.

import java.io.*;class DemoArray

{

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


System.out.println("Enter how many sub");int n=Integer.parseInt(br.readLine());

int marks[]=new int[n];

for(int i=0;i


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5. Write a Java program to display multiplication table.

import java.io.*;class Multiplication

{



System.out.println("enter n value");int n=Integer.parseInt(br.readLine());

System.out.println("...Multiplication Table...");

for(int i=1;i


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6. Write a java program to check whether given number is prime or not.

import java.util.*;

import java.lang.*;

import java.io.*;

class Prime1{

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

BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

System.out.println("enter n value");

int n=Integer.parseInt(br.readLine());int count=0;

for(int i=1;i


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7. Write a Java application on Matrix Addition.

import java.io.*;class MA

{



//size of mat1System.out.println("Enter no of rows and cols of mat1");

int m=Integer.parseInt(br.readLine());

int n=Integer.parseInt(br.readLine());

//size of mat2System.out.println("Enter no of rows and cols of mat2");

int p=Integer.parseInt(br.readLine());

int q=Integer.parseInt(br.readLine());int i,j;

int mat1[][]=new int[m][n];int mat2[][]=new int[p][q];int mat3[][]=new int[m][q];

if(m==q&&n==p)

{

//first matrixSystem.out.println("Enter elements in mat1:");

for(i=0;i


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}

//addition

for(i=0;i


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8. Write a Java program on Matrix Multiplication.

// matrix multiplicationimport java.io.*;

class MM

{


BufferedReader br=new BufferedReader(new InputStreamReader(System.in));//size of mat1

System.out.println("Enter no of rows and cols of mat1");

int m=Integer.parseInt(br.readLine());

int n=Integer.parseInt(br.readLine());//size of mat2

System.out.println("Enter no of rows and cols of mat2");

int p=Integer.parseInt(br.readLine());int q=Integer.parseInt(br.readLine());

int i,j;int mat1[][]=new int[m][n];int mat2[][]=new int[p][q];

int mat3[][]=new int[m][q];

if(n==p)

{//first matrix

System.out.println("Enter elements in mat1:");

for(i=0;i


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System.out.println();

}

//multiplicationfor(i=0;i


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9. Write a java program for array copying method.

import java.io.*;public class CopyArray

{

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


System.out.println("Enter array length ");int n=Integer.parseInt(br.readLine());

String array1[]=new String[n];

String array2[]=new String[n];

System.out.println("Enter strings into array1: ");System.out.println("...................................");

for(int i=0;i


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Output:

Enter array length5

Enter strings into array1:

...................................

Enter the string1q

Enter the string2w

Enter the string3

e

Enter the string4r

Enter the string5

tEnter strings into array2:

...................................Enter the string1a

Enter the string2

s

Enter the string3d

Enter the string4

fEnter the string5

g

Array1:[ q w e r t]

Array2:

[ a s d f g]AfterCopying:

[ q w d f g]

SVEC, Suryapet

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10. Write a program on Static method.

import java.io.*;

class StaticMethod{

static int sum(int a,int b)

{

int c=a+b;return c;

}}

class Demo

{

public static void main(String args[]){

int x=StaticMethod.sum(10,50);

System.out.println(x);}

}

Output:

sum=60

SVEC, Suryapet

13


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11. Write a java application on Static variable.

import java.io.*;class Test

{

static int x;

int y;void inc()

{x=x+1;

y=y+1;

}

void show(){

System.out.println("x value is:"+x);

System.out.println("y value is:"+y);}

}class Static{


{

Test t1=new Test();Test t2=new Test();

System.out.println("First obj values:");

t1.inc();t1.show();

System.out.println("Second obj values:");

t2.inc();t2.show();

}

}

Output:

First obj values:

x value is:1y value is:1

Second obj values:

x value is:2

y value is:1

SVEC, Suryapet

14


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12. Write a program on Constructor.

class Rectangle{

int l,w;

void getData(int x,int y)

{l=x;

w=y;}

int rectArea()

{

return(l*w);}

}

class RectArea{

public static void main(String args[ ]){Rectangle r1=new Rectangle( );

r1.getData(10,15);

int k=r1.rectArea( );System.out.print("Area is:"+k);

}

}

Output :

Area is:150

SVEC, Suryapet

15


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13. Write a java program for This keyword

import java.io.*;class Test

{

int a,b;

void getData(){

this.a=10;this.b=20;

}

void show()

{System.out.println("a value is:"+a);

System.out.println("b value is:"+b);

}}

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

{

Test t=new Test();

t.getData();t.show();

}

}

Output:

a value is:10

b value is:20

SVEC, Suryapet

16


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14 Write a java program on Command Line Arguments.

public class GetCommandLine{

public static void main(String args[]) {

System.out.println("----->>Getting command line arguments --");

for(int i=0;ijavac GetCommandLine.java

>java GetCommandLine 10 20 30 40 50

----->>Getting command line arguments --

Argument [1] is = 10Argument [2] is = 20

Argument [3] is = 30



15. Write a program to find sum of given Command Line Arguments.

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import java.io.*;

import java.lang.*;public class Cmd

{


{int sum=0;

for(int i=0;ijavac Cmd.java

>java Cmd 10 15 20 25 30

sum is=100

16. Write a program on Method Overloding.

SVEC, Suryapet

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import java.io.*;

class MethodOverLoad{

void calValue()

{

int x=20;x=x*x;

System.out.println("Sqrt of x is:"+x);}

void calValue(int y)

{

y=y*y*y;System.out.println("Cube of y is:"+y);

}

void calValue(int m,int n){

int z=m*n;System.out.println("Product of m and n is:"+z);}

}

class MOV

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

{

MethodOverLoad m=new MethodOverLoad();m.calValue();

m.calValue(10,20);

m.calValue(10);}

}

Output:

Sqrt of x is:400

Product of m and n is:200Cube of y is:1000

17. Write a program on Method Overriding.

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import java.io.*;

class One{

int calculate(int n)

{

return n;}

}class Two extends One

{

int calculate(int n)

{return(n*n);

}

}class MOR

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

Two t=new Two();

int m=t.calculate(3);

System.out.println("Multiplication is:"+m);}

}

Output:

Multiplication is:9

18. Write a program on Constructor Overloding.

SVEC, Suryapet

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import java.lang.*;

class Test{

int a,b;

Test()

{a=1;

b=2;}

Test(int x)

{

a=b=x;}

Test(int a, int b)

{this.a=a;

this.b=b;}void show()

{

System.out.println("a value is:"+a);

System.out.println("b value is:"+b);}

}

class COL{

public static void main(String args[])

{Test t1=new Test();

t1.show();

Test t2=new Test(10);t2.show();

Test t3=new Test(15,25);

t3.show();

}}

Output:

a value is:1

b value is:2a value is:10

b value is:10

a value is:15

b value is:25

19. Write a java program to calculate Factorial of a given number using Recursion concept.

SVEC, Suryapet

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import java.io.*;

import java.util.*;class Factorial

{

int fact(int n)

{int r;

if(n==1)return 1;

else

r=fact(n-1)*n;

return r;}

}

class Recursion{

public static void main(String args[])throws IOException{Factorial f=new Factorial();


System.out.println("Enter num to find factorial");

int x=Integer.parseInt(br.readLine());int k=f.fact(x);

System.out.println("The fatorial of"+x+"is="+k);

}}

Output:

Enter num to find factorial

5The fatorial of5is=120

20. Write a program on InnerClass concept.

SVEC, Suryapet

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class Outer

{Inner in=new Inner();

class Inner

{

public void sayHello(){

System.out.println("Hello");}

}

}

class DemoInner{


{Outer o=new Outer();

o.in.sayHello();}}

Output:

Hello

21. Write a java program to check whether string is Palindrome or not

SVEC, Suryapet

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import java.io.*;

class Polindrome{


{

BufferedReader br=new BufferedReader(new InputStreamReader(System.in));System.out.println("Enter any string");

String x=new String(br.readLine());StringBuffer y=new StringBuffer(x) ;

StringBuffer z=y.reverse();

String s=z.toString();

if(x.compareTo(s)==0){

System.out.println("The string is polindrome");

}else

{System.out.println("The string is not a polindrome");}

}

}

Output:

Enter any stringmom

The string is polindrome

Enter any string

god

The string is not a polindrome

22. Write a java program to print given strings in alphabetical order.

SVEC, Suryapet

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import java.util.*;

import java.io.*;class Alpha

{



int i,j;System.out.println("Enter how many no of strings to print in order ");

String str=br.readLine();

int n=Integer.parseInt(str);

String s[]=new String[n];for(i=0;i


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import java.io.*;

class NumSort{


{

int i,j;BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

System.out.println("Enter how many numbers print in order: ");int m=Integer.parseInt(br.readLine());

int num[]=new int[m];

int n=num.length;

System.out.println("Enter numbers:");for(i=0;i


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Enter how many numbers print in order:

5Enter numbers:

6

8

37

4Before sorting:

6

8

37

4

Sorted list is:8

764

3

24. Write a java program on StringTokenizer class.

SVEC, Suryapet

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import java.util.*;

import java.lang.*;import java.io.*;

class StringToken

{


String str=new String("welcome to java lab");StringTokenizer stz=new StringTokenizer(str);

System.out.println("No.of words are:");

System.out.println(stz.countTokens());

System.out.println("Tokens are:");while(stz.hasMoreTokens())

{

System.out.println(stz.nextToken());}

int count=0;for(int i=0;i


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import java.io.*;

import java.util.*;class AddTokens

{



System.out.println("Enter numbers");String s=br.readLine();

StringTokenizer str=new StringTokenizer(s ,"+");

int sum=0;

while(str.hasMoreTokens()){

sum=sum+Integer.parseInt(str.nextToken());

}System.out.println("Addition of tokens="+sum);

}}

Output:

Enter numbers100+100+100

Addition of tokens=300

26. Write a java program to display a Peramid.

SVEC, Suryapet

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class Peramid

{public static void main(String args[])

{

int i,j,k,l;

for(i=1;i


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interface Father

{int PROP1=500000;

}

interface Mother

{int PROP2=800000;

}class Child implements Father,Mother

{

void property()

{System.out.println("child property="+(PROP1+PROP2));

}

}class MultiInher

{public static void main(String args[]){

Child ch=new Child();

ch.property();

}

Output:

child property=1300000

28. Write an example using StringTokenizer class.

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import java.io.*;

import java.util.*;class DiffData

{



System.out.println("enter name,age,salary");String s=br.readLine();

StringTokenizer str=new StringTokenizer(s,",");

String s1=str.nextToken();

String s2=str.nextToken();String s3=str.nextToken();

s1=s1.trim();

s2=s2.trim();s3=s3.trim();

String name=s1;int age=Integer.parseInt(s2);float salary=Float.parseFloat(s3);

System.out.println("name="+name);

System.out.println("Age="+age);

System.out.println("Salary="+salary);}

}

Output:

enter name,age,salarypuja,24,15000

name=puja

Age=24Salary=15000.0

29. Write a java program to display Employee data.

SVEC, Suryapet

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import java.io.*;

class Employee{

int id;

String name;

Employee(int i,String n){

id=i;name=n;

}

void displayData()

{System.out.println(id+"\t"+name);

}

}class Group

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


Employee arr[]=new Employee[5];

for(int i=0;i


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1

enter namerani

enter id

2

enter namebhavya

enter id3

enter name

madhu

enter id4

enter name

peethienter id

5enter namesonu

Employee data

1 rani

2 bhavya3 madhu

4 peethi

5 sonu

30. Write a java program using Super keyword.

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import java.io.*;

class A{

int a;

A(int a)

{this.a=a;

}void showA()

{

System.out.println("The value of a is "+a);

}}

class B extends A

{int b;

B(int a,int b){super(a);

this.b=b;

}

void showB(){

System.out.println("The value of b is "+b);

}}

class SuperKey


{

B o=new B(100,200);o.showA();

o.showB();

}

}

Output:

The value of a is 100The value of b is 200

31. Write a java program using Abstract class.

SVEC, Suryapet

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abstract class A

{abstract void call();

void callMethod()

{

System.out.println("This is concreate method");}

}class B extends A

{

void call()

{System.out.println("This is implementation of class ");

}

}class AbstractDemo

{public static void main(String args[]){

B b=new B();

b.call();

b.callMethod();}

}

Output:

This is implementation of class

This is concreate method

32. Write a java program on creating package.

SVEC, Suryapet

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//creating own package.

package pack;

public class Add

{

public int i,j;public Add(int i,int j)

{this.i=i;

this.j=j;

}

public void add(){

System.out.println("Details");

System.out.println(".................");System.out.println("Additon is: "+(i+j));

}}

//implementation of a package.

import pack.Add;

class PackExe


{

Add a=new Add(20,45);a.add();

}

}

Output:

>javac -d . Add.java

>javac PackExe.java

>java PackExe

Details.................

Additon is: 65

33. Write a java program on Interface concept.

SVEC, Suryapet

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interface MyInterface

{public void sayHello();

}

class Subclass implements MyInterface

{public void sayHello()

{System.out.println("hello");

}

}

class DemoInterface{

public static void main(String args[ ])

{Subclass i=new Subclass();

i.sayHello();}}

Output:

hello

34. Write a java program on Stack ADT.

SVEC, Suryapet

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import java.io.*;

import java.util.*;class StackDemo

{

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

{Stack st=new Stack();

int choice=0;int position,element;


while(choice


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STACK OPERATION

1 push an element2 pop an element

3 search an element

4 Exit

your choice:1

enter elements:11

stack contents:[11]

STACK OPERATION


3 search an element

4 Exityour choice:

1enter elements:22

stack contents:[11, 22]

STACK OPERATION


3 search an element

4 Exityour choice:

3

which element to search22

position1

stack contents:[11, 22]STACK OPERATION

1 push an element

2 pop an element

3 search an element4 Exit

your choice:

2

popped=22stack contents:[11]

STACK OPERATION1 push an element

2 pop an element

3 search an element

4 Exityour choice:

4

35. Write a java program on data into a file.

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import java.io.*;

class CreateFile{


{

DataInputStream dis=new DataInputStream(System.in);FileOutputStream fout=new FileOutputStream("myfile.txt");

System.out.println("enter text & enter @ at the end");char ch;

while((ch=(char)dis.read())!='@')

fout.write(ch);

fout.close();}

}

Output:

enter text & enter @ at the endwelcome to svec @

36. Write a java program on try,catch,finally blocks.

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class DemoEx1


{

try

{int a,b,c;

a=Integer.parseInt(args[0]);b=Integer.parseInt(args[1]);

c=a/b;

System.out.println("Result is ="+c);

}catch (ArithmeticException ae)

{

System.out.println("not enter zeros");}

catch (ArrayIndexOutOfBoundsException e){System.out.println("enter at least 2 no's");

}

catch (NumberFormatException ne)

{System.out.println("enter int values");

}

finally{

System.out.println("This is final");

}}

}

Output:

>javac DemoEx1.java

>java DemoEx1

enter at least 2 no's

This is final

>java DemoEx1 12 23

Result is =0

This is final

>java DemoEx1 12 3

Result is =4This is final

37. Write a java program to search a file.

SVEC, Suryapet

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import java.io.*;

class DisplayFile{


{

int i;FileInputStream fin;

try{

fin=new FileInputStream(args[0]);

}

catch(FileNotFoundException e){

System.out.println("File Not Found");

return;}

do{i=fin.read();

if(i!=-1)

System.out.println((char)i);

}while(i!=-1);

fin.close();

}}

one.txt:

hai hello

Output:

>javac DisplayFile.java

>java DisplayFile one.txt

h

ai

h

e

l

lo

38. Write a java program on creating own exception.

SVEC, Suryapet

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class VException extends Exception

{VException(String s)

{

super(s);

}}

class Voting{

static void displayvote(int age)throws VException

{

if(agejavac UserExe.java

>java UserExe 23

Candidate is eligible to vote

>java UserExe 16

Invalid age

39. Write a java program to copy a file.

SVEC, Suryapet

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import java.io.*;

class DisplayFile1{


{

int i;FileInputStream fin;

FileOutputStream fout;try

{

fin=new FileInputStream(args[0]);

}catch(FileNotFoundException e)

{

System.out.println("Input File Not Found");return;

}catch(ArrayIndexOutOfBoundsException e){

System.out.println("Usage:showFile");

return;

}//opening o/p file

try

{fout=new FileOutputStream(args[1]);

}

catch(FileNotFoundException e){

System.out.println("Error in opening output file");

return;}

catch(ArrayIndexOutOfBoundsException e)

{

System.out.println("Usage:copy file from to");return;

}

try

{do

{i=fin.read();

if(i!=-1)

fout.write(i);

}while(i!=-1);

}

catch(IOException e){

System.out.println("File Error");

}fin.close();

fout.close();

}

}

Output:

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class MyThread extends Thread

{public void run()

{

try

{for(int i=1;i


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class MyThread implements Runnable

{public void run()

{

try

{for(int i=1;i


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class MyThread1 extends Thread

{public void run()

{

try

{for(int i=0;i


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class MyThread1 extends Thread

{public void run()

{

try

{for(int i=0;i


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class ThreadGroupPro


{

ThreadGroup tg=new ThreadGroup("subgroup1");

Thread t1=new Thread(tg,"Thread1");Thread t2=new Thread(tg,"Thread2");

Thread t3=new Thread(tg,"Thread3");tg=new ThreadGroup("subgroup2");

Thread t4=new Thread(tg,"Thread4");

Thread t5=new Thread(tg,"Thread5");

tg=Thread.currentThread().getThreadGroup();int age=tg.activeGroupCount();

System.out.println("No.of sub groups="+age);

System.out.println("Groups are");tg.list();

}}

Output:

No.of sub groups=2

Groups are

java.lang.ThreadGroup[name=main,maxpri=10]Thread[main,5,main]

java.lang.ThreadGroup[name=subgroup1,maxpri=10]

java.lang.ThreadGroup[name=subgroup2,maxpri=10]

45. Write a Java program to draw different shapes using applets

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LinRect.java:

import java.applet.*;

import java.awt.*;

public class LinRect extends Applet

{public void paint(Graphics g)

{g.drawLine(100,100,500,500);

g.drawRect(10,60,40,30);

g.fillRect(60,10,30,80);

g.drawRoundRect(10,100,80,50,10,10);g.drawLine(100,10,230,140);

g.drawLine(100,140,230,10);

}}

LinRect.html:

Output:

>javac LinRect.java

>appletviewer LinRect.html

46. Write a java program to pass parameters to applets.

SVEC, Suryapet

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HelloParam.java:

import java.awt.*;


public class HelloParam extends Applet{

String str,n,x;public void init()

{

str=getParameter("s");

n=getParameter("num");}

public void paint(Graphics g)

{g.drawString("Name is"+str,10,20);

g.drawString("Number is"+n,10,50);}}

HelloParam.html:

Output:

>javac HelloParam.java

>appletviewer HelloParam.html

47. Write a java program to get values at runtime by using the applets.

SVEC, Suryapet

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UserIn.java:

import java.awt.*;


import java.awt.event.*;

public class UserIn extends Applet{

TextField text1,text2;public void init()

{

setBackground(Color.black);

setForeground(Color.red);text1=new TextField(8);

text2=new TextField(8);

add(text1);add(text2);

text1.setText("0");text2.setText("0");}

public void paint(Graphics g)

{

int x=0,y=0,z=0;String s1,s2,s;

g.drawString("Enter no in each box",10,50);

try{

s1=text1.getText();

x=Integer.parseInt(s1);s2=text2.getText();

y=Integer.parseInt(s2);

}catch(Exception e)

{

System.out.println(e);

}z=x+y;

s=String.valueOf(z);

g.drawString("The sum is",10,75);

g.drawString(s,150,75);}

public boolean action(Event ent,Object obj){

repaint();

return true;

}}

UserIn.html:

Output:

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>javac UserIn.java

>appletviewer UserIn.html

48. Write a java program to add all components to the container.

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ControlDemo.java:

import java.awt.*;


public class ControlDemo extends Applet

{public void init()

{setLayout(new FlowLayout(FlowLayout.LEFT,20,20));

TextField tf=new TextField("TypeHere",20);

TextArea ta=new TextArea(3,4);

add(tf);add(ta);

setForeground(Color.red);

Label l=new Label("This is mech");add(l);

Button b=new Button("Login");add(b);Choice c=new Choice();

c.add(" ");

c.add("Graduate");

c.add("Postgraduate");add(c);

List lt=new List(4,true);

lt.add(" ");lt.add("INDIA");

lt.add("USA");

add(lt);Checkbox ck=new Checkbox("Cinema");

CheckboxGroup ckg=new CheckboxGroup();add(ck);

Checkbox rb1=new Checkbox("Female",true,ckg);

add(rb1);

Checkbox rb2=new Checkbox("Male",false,ckg);add(rb2);

Scrollbar s=new Scrollbar(Scrollbar.HORIZONTAL,0,10,0,255);

add(s);

}}

ControlDemo.html:

Output:

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>javac ControlDemo.java

>appletviewer ControlDemo.html

49. Write a java to create login window user by AWT.

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import java.awt.*;

import java.io.*;class MyWindow3 extends Frame

{

MyWindow3()

{setSize(200,200);

setLayout(new FlowLayout());setTitle("Login screen");

Label l1=new Label("username");

Label l2=new Label("passward");

TextField tf1=new TextField(10);TextField tf2=new TextField(10);

Button b=new Button("login");

tf2.setEchoChar('*');add(l1);

add(tf1);add(l2);add(tf2);

add(b);

setVisible(true);

}}

class LoginWindow

{public static void main(String args[ ])

{

MyWindow3 mw=new MyWindow3();}

}

Output:

>javac LoginWindow.java

>java LoginWindow

50. Write a java program for FlowLayout.

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import java.awt.*;

class DemoFlowLayout extends Frame{

public DemoFlowLayout()

{

setLayout(new FlowLayout());for(int i=1;ijavac DemoFlowLayout.java

>java DemoFlowLayout

51. Write a java program for GridLayout.

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import java.awt.*;

import java.applet.*;class DemoGridLayout extends Frame

{

public DemoGridLayout()

{setLayout(new GridLayout(5,4));

for(int i=1;ijavac DemoGridLayout.java

>java DemoGridLayout

52. Write a java program for BorderLayout.

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import java.awt.*;

import java.applet.*;import java.awt.event.*;

class DemoBoarder extends Frame

{

Button b1,b2,b3,b4,b5;public DemoBoarder()

{setLayout(new BorderLayout());

b1=new Button("one");

b2=new Button("two");

b3=new Button("three");b4=new Button("four");

b5=new Button("five");

add(b1,"East");add(b2,"West");

add(b3,"North");add(b4,"South");add(b5,"Center");

setSize(300,300);

setVisible(true);

}public static void main(String args[])

{

DemoBoarder db=new DemoBoarder();}

}

Output:

>javac DemoBoarder.java

>java DemoBoarder

53. Write a java program for CardLayout.

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CardLayoutDemo.java:

import java.awt.*;



public class CardLayoutDemo extends Applet implements ActionListener{

CardLayout cl;Panel p;

public void init()

{

p=new Panel();add(p);

cl=new CardLayout();

p.setLayout(cl);initialisation();

}void initialisation(){

Button b1=new Button("Button1");

Button b2=new Button("Button2");

Button b3=new Button("Button3");b1.addActionListener(this);

b2.addActionListener(this);

b3.addActionListener(this);p.add(b1,"Button1");

p.add(b2,"Button2");

p.add(b3,"Button3");}

public void actionPerformed(ActionEvent e)

{cl.next(p);

}

}

CardLayoutDemo.html:

Output:

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>javac CardLayoutDemo.java

>appletviewer CardLayoutDemo.html

54. Write a java program using HashSet method.

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import java.util.*;

class HS


{

HashSet hs=new HashSet();

hs.add("india");hs.add("us");

hs.add("uk");hs.add("japan");

System.out.println("HashSet ="+hs);

Iterator it=hs.iterator();

System.out.println("elements using iterator");while(it.hasNext())

{

String s=(String)it.next();System.out.println(s);

}}}

Output:

>javac HS.java

>java HS

HashSet =[uk, japan, us, india]elements using iterator

uk

japanus

india

55. Write a java program on Server and Client

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Server1.java:

import java.io.*;import java.net.*;

class Server1

{

public static void main(String args[]) throws Exception{

ServerSocket ss=new ServerSocket(777);Socket s=ss.accept();

System.out.println("connection establisted");

OutputStream obj=s.getOutputStream();

PrintStream ps=new PrintStream(obj);String str="Hello client";

ps.println(str);

ps.println("Good Bye");ps.close();

ss.close();s.close();}

}

Client1.java:

import java.io.*;

import java.net.*;class Client1

{


Socket s=new Socket("localhost",777);

InputStream obj=s.getInputStream();BufferedReader br=new BufferedReader(new InputStreamReader(obj));

String str;

while((str=br.readLine())!=null)

System.out.println("from Server1:"+str);br.close();

s.close();

}

}

Output:

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From Server:

>javac Server1.java

>java Server1

connection establisted

From Client:

>javac Client1.java

>java Client1

from Server1:Hello clientfrom Server1:Good Bye

56. Write a java program on chat between Server and Client.

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Server2.java:


class Server2

{


ServerSocket ss=new ServerSocket(777);Socket s=ss.accept();

System.out.println("...........connection establisted..............");

PrintStream ps=new PrintStream(s.getOutputStream());

BufferedReader br=new BufferedReader(new InputStreamReader(s.getInputStream()));BufferedReader kb=new BufferedReader(new InputStreamReader(System.in));

while(true)

{String str1,str;

while((str=br.readLine())!=null){System.out.println(str);

str1=kb.readLine();

ps.println(str1);

}ps.close();

ss.close();

s.close();br.close();

kb.close();

System.exit(0);}

}

}

Client2.java:


class Client2

{


Socket s=new Socket("localhost",777);DataOutputStream dos=new DataOutputStream(s.getOutputStream());

BufferedReader br=new BufferedReader(new InputStreamReader(s.getInputStream()));

BufferedReader kb=new BufferedReader(new InputStreamReader(System.in));

String str,str1;while(!(str=kb.readLine()).equals("exit"))

{

dos.writeBytes(str+"\n");str1=br.readLine();

System.out.println(str1);

}s.close();

dos.close();

br.close();

kb.close();}}

Output:

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From Server:

>javac Server2.java

>java Server2

...........connection establisted..............hello

haihow r u

iam fine

bye.

From Client:

>javac Client2.java

>java Client2hello

hai

how r u

iam finebye.

57. Write a java program on Canvas.

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CanvasDemo.java:

import java .awt.*;import java.applet.*;

public class CanvasDemo extends Applet

{

public void init(){

setBackground(Color.red);CanvasExe ce=new CanvasExe();

ce.setSize(200,200);

ce.setBackground(Color.blue);

ce.setVisible(true);add(ce);

}

class CanvasExe extends Canvas{

public void paint(Graphics g){setForeground(Color.green);

g.fillOval(30,0,80,80);

g.drawString("Hello",50,100);

}}

}

CanvasDemo.html:

Output:

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>javac CanvasDemo.java

>appletviewer Canvas.html

58. Write a java program for EventHandling.

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import java.awt.*;


class Mywindow extends Frame implements ActionListener{

Button b;

public Mywindow()

{super("DemoEvents");

setLayout(null);b=new Button("Exit");

b.setBounds(150,200,100,300);

add(b);

b.addActionListener(this);}

public void actionPerformed(ActionEvent e)

{System.exit(0);

}}class DemoEvent

{


{Mywindow f=new Mywindow();

f.setSize(200,200);

f.setVisible(true);}

}

Output:

>javac DemoEvent.java

>java DemoEvent

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OOPS Lab through JAVA, CSE & CSIT Depts. 79

Java Lab 2-1 Manual It & Cse2009-10

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Transcript of Java Lab 2-1 Manual It & Cse2009-10