JNTU JAVA Lab Manual Programs

RAO&NAIDU ENGINEERING COLLEGE LAB: Object Oriented Programming IInd CSE

For More solutions : 1 Ravinuthalavs.webs.com Ravinuthalavs.blogspot.com

IV YEAR B.Tech

JAVA PROGRAMMING MANUAL OOP’s Through Java

Prepared

By

R.Venkata Subbaiah Associate Professor

IC RNEC@Development Cell

Department of CSE

RAO & NAIDU ENGINEERING COLLEGE



ONGOLE



Week:1-A

AIM:write a java program to print all real solutions to the qudratic eq ax2+b+c=0

Read a,b,c values and use the formula (–b+sqrt(b2-4ac))/2a.

SOURCE CODE:

//importing io class

import java.io.*;

//importing Math class

import java.lang.Math;

class qd_eq

{

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

{

String s;

int a,b,c,d;

double r1,r2;

DataInputStream in=new DataInputStream(System.in);

System.out.print("Enter a value?");

s=in.readLine();

a=Integer.parseInt(s);

System.out.print("Enter b value?");

s=in.readLine();



b=Integer.parseInt(s);

System.out.print("Enter c value?");

s=in.readLine();

c=Integer.parseInt(s);

d=((b*b)-(4*a*c));

if(d<0)

{

System.err.println("No real solution...");

}

else

{

r1=((-b)+Math.sqrt(d))/(2*a);

r2=((-b)-Math.sqrt(d))/(2*a);

System.out.println("Root 1 = "+r1);

System.out.println("Root 2 = "+r2);

}

}

}



OUTPUT:

COMPILATION:

D:\cse>javac qd_eq.java

INTERPRETATION:

D:\cse>java qd_eq



Week:1-B

AIM: write a java program to print a fibonacci series 1,1,2,3…………….. upto the

scanned or need value

File Name: fib.java

Source code:

//importing io classes

import java.io.*;

class Fibonacci

{


{


String s;

int a=1,b=1,c=a+b;

int n;

System.out.print("Enter nth value?");

s=in.readLine();

n=Integer.parseInt(s);

System.out.print(a+","+b);



while(c<=n)

{

System.out.print(c+",");

a=b;

b=c;

c=a+b;

}

}

}



Out put:

Compilation:

D:/cse>javac fibonacci.java

Interpretation:

D:/cse>java fibanocci



Week:2-A

AIM : write a java program to accept a number and print all the numbers.

FileName: prime.java

Source code:

//import io package

import java.io.*;

class prime

{


{

String s;

int no,i,j;


System.out.print("Enter a value?");

s=in.readLine();

no=Integer.parseInt(s);

for(i=no;i>=1;i--)



{

for(j=2;j<i;j++)

{

if(i%j==0)

break;

}

if(i==j)

System.out.println(i+" is a prime no..");

}

}

}



Output:

Compilation:

D:\cse>javac prime.java

Interpretation:

D\:cse>java prime



Rollno:09771A0524 WEEK:2-B

AIM: write a java program to display multiplication of two 3*3 matrices.

File name: matmul.java

Source code:

//import io package

import java.io.*;

class matmul

{


{

int mat1[][]={{1,2,3},{4,5,6},{7,8,9}};

int mat2[][]={{1,2,3},{4,5,6},{7,8,9}};

int mat3[][],i,j,k;

mat3=new int[3][3];

for(i=0;i<=2;i++)



{

for(j=0;j<=2;j++)

{

for(k=0;k<=2;k++)

{

mat3[i][j]+=mat1[i][k]*mat2[k][j];

}

}

}

System.out.println("After Matrix Multiplicatin......");

for(i=0;i<=2;i++)

{

for(j=0;j<=2;j++)

{

System.out.print(mat3[i][j]+"\t");

}

System.out.print("\n");

}

}

}



Output:

Compilation:

D:\cse>javac matmul.java

Interpretation:

D:\cse>java matmul



Rollno:09771A0524 WEEK:2-C

AIM:write a java program that reads a line of integers and then display each integer

and the sum of all integers.

File Name: stoken.java



Source code:

import java.io.*;

import java.util.*;

class stoken

{

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

{

int sm=0,no;

String s;


System.out.print("Enter numbers ?");

s=in.readLine();

StringTokenizer token =new StringTokenizer(s);

while(token.hasMoreTokens())

{

no=Integer.parseInt(token.nextToken());

sm+=no

System.out.println(no);

}

System.out.println("Sum : "+sm);

}

}



OUT PUT:

COMPILATION:

D:/cse>javac stoken.java



INTERPRETATION:

D:/cse>java stoken

Rollno:09771A0524 WEEK:3-A

Aim: write a java program that checks whether the given string is palindrome or not.



File Name: pal.java

Source code:

\\import io package\\

import java.io.*;

class pal

{


{

int i,j,len;

String s;


System.out.print("Enter a string ?");

s=in.readLine();

len=s.length();

for(i=0,j=len-1;i<len/2;i++,j--)

{

if(s.charAt(i)!=s.charAt(j))

break;

}



if(i==j)

System.out.println("Pal string");

else

System.out.println("Not a Pal string");

}

}

Output:

Compilation:



D:/cse>javac pal.java

Interpretation:

D:/cse>java pal




AIM: write a java program for sorting given list of names in ascending or descending.

FileName: strsort.java

Source code:

\\importing io class\\

import java.io.*;

class strsort

{


{

int i,j,len;

String s[]=new String[5],swp;


System.out.println("Enter 5 strings ?");

for(i=0;i<=4;i++)

s[i]=in.readLine();

for(i=0;i<=3;i++)

{

for(j=i+1;j<=4;j++)

if(s[i].compareTo(s[j])>0)

{



swp=s[i];

s[i]=s[j];

s[j]=swp;

}

}

System.out.println("After sort....");

for(i=0;i<=4;i++)

System.out.println(s[i]);

}

}



Output:

Compilation:

D:/cse>javac strsort.java

Interpretation:

D:/cse>java strsort




Aim: write a java program to count frequency of words

File Name: wordcount.java

Source code:


import java.io.*;

import java.util.*;

class wordcount

{


{

int ctr=0;

String s,s1,s2;


System.out.println("Enter a string with words ?");

s=in.readLine();

StringTokenizer token1 =new StringTokenizer(s);

StringTokenizer token2 ;

while(token1.hasMoreTokens())



{

token2=new StringTokenizer(s);

s1=token1.nextToken();

ctr=0;

while(token2.hasMoreTokens())

{

s2=token2.nextToken();

if(s1.equals(s2))

ctr++;

}

System.out.println("'"+s1+"' Frequency "+ctr+"

Times");

}

}

}



Output:

Compilation:

D:\cse>javac wordcount.java

Interpretation:

D\:cse>java wordcount




AIM:Program to read a file and check whether the file exists,readable,writable

and also print the length.

File Name: filetest.java

So urce code:

//import io package//

import java.io.*;

class filetest

{

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

{

String fname;


System.out.print("Enter a file name?");

fname=in.readLine();

//opening file

File f=new File(fname);



if(f.exists())

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

else

System.out.println("File not exists..");

if(f.canRead())

System.out.println("File is readable..");

else

System.out.println("File is not readable..");

if(f.canWrite())

System.out.println("File is writable..");

else

System.out.println("File is not Writable..");

System.out.println("File length :"+f.length());

}

}



OUTPUT:

Compilation:

D:csejava>javac filetest.java

Interpretataion:

D:\csejava>java filetest




AIM:Program to read a file and print the file with line numbers.

FileName: fileread.java

Source code:


import java.io.*;

class fileread

{


{

int ch,ctr=1;

String fname;






//opening file

FileInputStream f=new FileInputStream(fname);

System.out.print(ctr+" ");

while((ch=f.read())!=-1)

{

System.out.print((char)ch);

if(ch=='\n')

{

ctr++;

System.out.print(ctr+" ");

}

}

}

}



OUTPUT:

Compilation:

D:\csejava>javac fileread.java

Interpretation:

D:\csejava>java fileread




AIM:Program to read a file and print char count,word count,line count.

File name: edit filestat.java

sourcecode:




import java.io.*;

class filestat

{


{

int pre=' ' , ch , ctr=0 , L=0 , w=1;

String fname;




//opening file

FileInputStream f=new FileInputStream(fname);

while((ch=f.read())!=-1)

{

//char count

if(ch!=' ' && ch!='\n')

ctr++;

//line count

if(ch=='\n')

L++;

//word count



if(ch==' ' && pre!=' ')

w++;

pre=ch;

}

System.out.println("Char count="+ctr);

System.out.println("Word count="+(w+(L-1)));

System.out.println("Line count="+L);

}

}

OUTPUT:

Compilation:

D:\csejava>javac filestat.java

Interpretation:



D:\csejava>java filestat


AIM: write a java program to implement stack using adt.

File name:



Edit stackadt.java

Source code:


import java.io.*;

//stack capable to store 4 elements

class Stack

{

int max,top;

int no[];

public Stack()

{

no=new int[5];

top=-1;

max=5;

}

public void push(int n)

{

if(top<max-1)

{

no[++top]=n;

}

else



System.out.println("Stack full..");

}

public int pop()

{

int val;

if(top==-1)

{

System.out.println("Stack is Empty...");

return -1;

}

else

{

val=no[top--];

}

return val;

}

public void print()

{

System.out.println("Stack elements are..");

for(int i=0;i<top;i++)

System.out.println(no[i]);

}



}

class StackTest

{


{

Stack s=new Stack();

s.push(11);

s.push(12);

s.push(13);

s.push(14);

s.push(15);

s.push(16);

s.print();

System.out.println("Pop ival="+s.pop());

s.print();

System.out.println("Pop ival="+s.pop());

s.print();

}

}

Output:

Compilation:



D:\cse>javac stackadt.java

Interpretation:

D:\cse>java stackadt

Week:5-B



AIM: write a java program to convert infix expression to postfix expression forms.

File name:

Edit intopost.java

Source code:


import java.io.*;

class intopost

{

int top,j,i;

String str;

char t,postfix[],s[];

public intopost()

{

top=-1;i=0;j=0;

postfix=new char[30];

s=new char[30];

}

public void push(char t)

top++;

s[top]=t;

}

public char pop()



{

char t;

t=s[top];

top--;

return t;

}

public void check()

{

while(priority(t)<=priority(s[top]))

postfix[j++]=pop();

}

int priority(char t)

{

if(t=='^')

return 4;

else

if(t=='*')

return 3;

else

if(t=='/')

return 2;



else

if(t=='+' || t=='-')

return 1;

else

return 0;

}

public void convert(String str)

{

Push(‘#’)

while(i<str.length())

{

t=str.charAt(i);

if( (t>='a' && t<='z') || (t>='A' && t<='Z'))

postfix[j++]=t;

else

{

if(t=='+' || t=='-' || t=='*' || t=='/' || t=='(' || t==')' || t=='^')

{

switch(t)

{

case '+':



case '-':

check();

push(t);

break;

case '*':

case '/':

check();

push(t);

break;

case '(':

push(t);

break;

case '^':

check();

push(t);

break;

case ')':

do

{

t=pop();

postfix[j++]=t;



}while(t!='(');

j--;

break;

}

}

}

i++;

}

while(s[top]!='#')

postfix[j++]=pop();

postfix[j]='\0';

System.out.println(postfix);

}


{

String str;


System.out.println("Enter a string?");

str=in.readLine();

(new intopost()).convert(str);

}

}



Output:

Compilation:

D:\cse>javac intopost.java

Interpretation:

D:\cse>java intopost



Week:5-C

AIM: write a java program to evaluate a postfix expression.

File name:

Edit pfexevl.java

Source code:


import java.io.*;

/import lang package//

import java.lang.Math;

class pfixevl

{

int top,j,i;

String str;

char t,postfix[];

int s[];

DataInputStream in;

public pfixevl()

{



top=-1;i=0;

postfix=new char[30];

s=new int[30];

in=new DataInputStream(System.in);

}

public void push(int val)

{

top++;

s[top]=val;

}

public int pop()

{

int val;

val=s[top];

top--;

return val;

}

public void evaluate(String str) throws IOException

{

int op1,op2,value=0;

while(i<str.length())

{



t=str.charAt(i);

if( (t>='a' && t<='z') || (t>='A' && t<='Z'))

{

System.out.print("Enter value for '"+t+"' ?");

value=Integer.parseInt(in.readLine());

push(value);

}

else

{

switch(t)

{

case '+':

op2=pop();

op1=pop();

value=op1+op2;

push(value);

break;

case '-':

op2=pop();

op1=pop();

value=op1-op2;

push(value);



break;

case '*':

op2=pop();

op1=pop();

value=op1*op2;

push(value);

break;

case '/':

op2=pop();

op1=pop();

value=op1*op2;

push(value);

break;

case '^':

op2=pop();

op1=pop();

value=(int)Math.pow((float)op1,(float)op2);

push(value);

break;

}

}

i++;



}

System.out.println("postfix evaluated val = "+value);

}


{

String str;


System.out.print("Enter a string?");

str=in.readLine();

(new pfixevl()).evaluate(str);

}

}



output:

Compilation:

D:/cse>javac pfexevl.java

Interpretation:

D:/cse>java pfexevl



Week:6-A

Aim: write a java program to develop an applet that display simple message.

File name:



Applt.java

Source code:

import java.awt.*;

import java.applet.*;

public class applt extends Applet

{

public void init()

{

resize(250,250);

}

public void paint(Graphics g)

{

Font myfont=new Font("Times new roman",Font.BOLD + Font.ITALIC,25);

g.setFont(myfont);

g.drawRect(100,100,300,450);

g.setColor(Color.orange);

g.fillRect(100,100,30,50);

g.setColor(Color.red);

g.drawString("hello world",120,120);

g.drawRect(100,100,300,450);

g.setColor(Color.green);



g.fillRect(150,150,30,50);

}

}

/*

<applet code=applt.class height=300 width=400>

</applet>

*/

Output:

Compilation:

D:\cse>javac applt.java



Interpretation:

D:\cse>appletviewer applt.java

Week:6-B



AIM:Develop an Applet that receives an integer in one text field and computes its

factorial value and returans it in another text field,when the button named

compute is clicked.

File name: edit appltfact.java

Source code:

\\import java packages\\


import java.awt.*;

import java.awt.event.*;

class actlstn implements ActionListener

{

public void actionPerformed(ActionEvent e)

{

int ctr=1,no=0,fact=1;

Button bt;

bt=(Button)e.getSource();

if((bt.getLabel()).equals("compute"))

{

no=Integer.parseInt(appltfact.t1.getText());

while(ctr<=no)

{



fact*=ctr;

ctr++;

}

appltfact.t2.setText(String.valueOf(fact));

}

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

}

}

public class appltfact extends Applet

{

static TextField t1,t2;

Label l1,l2;

Button b;

public void init()

{

l1=new Label("enter an integer.");

l2=new Label("fatorial val:")

t1=new TextField();

t2=new TextField(" ");

b=new Button("compute");

add(l1);

add(t1);



add(l2);

add(t2);

b.addActionListener(new actlsn());

add(b);

setSize(300,400);

setVisible(true);

}


{

showStatus("computing Factorial value...");

}

}

\\applet code\\

/*

<applet code=appltfact.class height=300 width=500 >

</applet>

*/



OUTPUT:

Compilation:

E:\ADITYA\csejava>javac appltfact.java

Interpretation:

D:\cse java>appletviewer appltfact.java



Week:7

AIM:Write a java program that works as a simple calculator use a grid layput to

arrange for the digits and for +,-,*,/,% operations.Adda text field to display the

resut.

File name:

Edit appltcal.java

Source code:

\\importing java packages\\


import java.awt.*;


//event listener interface for event handling

class actlstn implements ActionListener

{


{

int no=0,val,prev;

String txt;

Button bt;



bt=(Button)e.getSource();

txt=bt.getLabel();

if(txt.equals("C"))

{

appltcal.t.setText("");

}

else

{

if(txt.equals("+"))

{

if(appltcal.sta==0)

{

appltcal.pval=Integer.parseInt(appltcal.t.getText());


appltcal.sta=1;

}

else

{

no=appltcal.pval;

no+=Integer.parseInt(appltcal.t.getText());



appltcal.t.setText(String.valueOf(no));

appltcal.sta=0;

}

}

if(txt.equals("-"))

{

if(appltcal.sta==0)

{



appltcal.sta=1;

}

else

{

no=appltcal.pval;

no-=Integer.parseInt(appltcal.t.getText());


appltcal.sta=0;

}

}

if(txt.equals("*"))

{



if(appltcal.sta==0)

{



appltcal.sta=1;

}

else

{

no=appltcal.pval;

no*=Integer.parseInt(appltcal.t.getText());


appltcal.sta=0;

}

}

if(txt.equals("/"))



{

if(appltcal.sta==0)

{



appltcal.sta=1;

}

else

{

no=appltcal.pval;

no/=Integer.parseInt(appltcal.t.getText());


appltcal.sta=0;

}

}

if(txt.equals("%"))

{

if(appltcal.sta==0)

{



appltcal.sta=1;



}

else

{

no=appltcal.pval;

no%=Integer.parseInt(appltcal.t.getText());


appltcal.sta=0;

}

}

}

}

}

public class appltcal extends Applet

{

static int sta,pval;

static TextField t;

Button a,m,d,s,r,b;

Panel p;

public void init()



{

t=new TextField("000000");

a=new Button("+");

s=new Button("-");

d=new Button("/");

m=new Button("*");

r=new Button("%");

b=new Button("C");

//adding listener

actlstn lstn=new actlstn();

a.addActionListener(lstn);

s.addActionListener(lstn);

d.addActionListener(lstn);

m.addActionListener(lstn);

r.addActionListener(lstn);

b.addActionListener(lstn);

//setting panel and layout

p=new Panel();

p.setLayout(new GridLayout(3,2));

p.add(t);

p.add(a);

p.add(s);



p.add(d);

p.add(m);

p.add(r);

p.add(b);

//adding pane

add(p);

setSize(300,400);

setVisible(true);

}


{

showStatus("Calculator...");

}

}

//applet code //

/*



<applet code=appltcal.class height=300 width=400>

</applet>

*/

OUTPUT:

Compilation:

D:\csejava>javac appltcal.java

Interpretation:

D:\csejava>appletviewer appltcal.java



Week:1-A

AIM:Write a java program for handling mouse events [whenever user moves the

mouse it had to display the xy coordinates on the canvas(graphics]

File name:



edit appltmouse.java

Source code:

import java.applet.;

import java.awt.Graphics;

import java.awt.TextField;

import java.awt.event.MouseMotionListener;

import java.awt.event.MouseEvent;

import java.awt.Panel;

public class appltmouse1 extends Applet implements MouseMotionListener

{

static TextField t;

int x,y;

public void mouseDragged(MouseEvent m)

{

}

public void mouseMoved(MouseEvent m)

{

x=m.getX();

y=m.getY();

appltmouse.t.setText(String.valueOf(x)+" ,

"+String.valueOf(y));

repaint();



}

public void init()

{

t=new TextField("........");

Panel p=new Panel();

p.add(t);

add(p);

//mouse event deligation

addMouseMotionListener(this);

setSize(300,400);

setVisible(true);

}


{

g.drawRect(20,20,100,200);

g.drawString(t.getText(),x,y);

}

}

//applet code///

/*

<applet code=appltmouse1.class height=300 width=400 >



</applet>

*/

OUTPUT:

Compilation:



D:\csejava>javac appltmouse.java

Interpretation:

D:\csejava>appletviewer appltmouse.java

Week:1-A



AIM:Write a java program that create 3 threads that the 1st thread to display

GOOD MORNING for every 1second,2nd

thread to display HELLO for every

2seconds and the 3rd

thread to display WELCOME for every 3 seconds.

File name:edit multhread.java

Source code:

import java.io.*;

import java.lang.*;

class threada extends Thread

{

public void run()

{

for(; ;)

{

try

{

System.out.println("GOOD MORNING");

sleep(1000);

}

catch(Exception e)

{



System.out.println(e.toString());

}

}

}

}

class threadb extends Thread

{

public void run()

{

for(; ;)

{

try

{

System.out.println("HELLO");

sleep(2000);

}

catch(Exception e)

{


}



}

}

}

class threadc extends Thread

{

public void run()

{

for(; ;)

{

try

{

System.out.println("WELCOME");

sleep(3000);

}

catch(Exception e)

{


}

}

}

}



class multhreadss

{

public static void main(String arg[])

{

//creating new thread

threada t1=new threada();

threadb t2=new threadb();

threadc t3=new threadc();

//staring threads

t1.start();

t2.start();

t3.start();

}

}



Output:

Compilation:

D:/csejava>javac multhreadss.java

Interpretation:

D:\csejava>java multhreadss



Week:1-A

AIM: write a java program that implements producer,consumer

problem using the concept of inter threacommunication.

File name:

Edit producerconsumer.java

Source code:


import java.io.*;

class Consumer extends Thread

{

private CubbyHole cubbyhole;

private int number;

public Consumer(CubbyHole c,int number)

{

cubbyhole=c;

this.number=number;

}

public void run()



{

int value=0;

for(int i=0;i<10;i++)

{

value=cubbyhole.get();

System.out.println("Consumer’ #’this.number+got+value);

}

}

}

class Producer extends Thread

{

private CubbyHole cubbyhole;

private int number;

public Producer(CubbyHole c, int number)

{

cubbyhole=c;

this.number=number;

}

public void run()

{

for(int i=10;i<20;i++)



{

cubbyhole.put(i);

try

{

sleep(100);

}

catch(InterruptedException e)

{

e.printStackTrace();

}

System.out.println("Consumer #"+this.number+"put:" +i);

}

}

}

class CubbyHole

{

private int contents;

private boolean available=false;

public synchronized int get()

{



while(available==false)

{

try

{

wait();

}

Catch(exception e)

{


}

}

available=false;

notifyAll();

return contents;

}

public synchronized void put(int value)

{

while(available==true)

{

try



{

wait();

}

catch (InterruptedException e)

{


}

}

available=true;

contents=value;

notifyAll();

}

}

public class ProducerConsumer

{

public static void main(String arg[])

{

CubbyHole c=new CubbyHole();

Producer p1= new Producer(c,2);

Consumer c1=new Consumer(c,1);



p1.start();

c1.start();

}

}

Output:

Compilation:

D:\cse>javac producerconsumer.java

Interpretation:

D:\cse>java producerconsumer



Week:1-A

AIM:Program to create an interface to perform division operations when user

enters the two integers.The division of two values must displayed in tth ethird

text box when user clicks the CAL button.if num1 & num2 are not integers then

the program to throw NumberFormatException,when num1 divide with 0 it has

to throw ArithematicException in exception Message label.

File name: framediv.java

Source code:

import java.io.*;

import java.awt.*;


import javax.swing.*;

class framediv extends JFrame implements ActionListener

{



JPanel p;

JTextField t1,t2,t3;

JButton b;

JLabel msg;


{

int n1,n2,n3;

JButton bt;

bt=(JButton)e.getSource();

if(bt.getLabel().equals("Cal"))

{

try

{

n1=Integer.parseInt(t1.getText());

n2=Integer.parseInt(t2.getText());

n3=n1/n2;

t3.setText(String.valueOf(n3));

msg.setText("Calculation performed......");

}

catch(NumberFormatException ex)

{

msg.setText("Wrong Data Values are enetered...");



}

catch(ArithmeticException ex)

{

msg.setText("Zero divide canot possible");

}

}

}

public framediv()

{

setTitle("Frame for division..");

p=new JPanel();

t1=new JTextField("10000");

t2=new JTextField("1000");

t3=new JTextField("Result Here");

b=new JButton("Cal");

//adding action listener

b.addActionListener(this);

p.add(t1);

p.add(new JLabel(" / "));

p.add(t2);

p.add(new JLabel(" = "));

p.add(t3);



p.add(b);

msg=new JLabel("Click Cal Button to perform cal...");

p.add(msg);

add(p);

setSize(300,400);

setVisible(true);

}

public static void main(String args[])

{

new framediv();

}

}



Output:

Compilation:

D:\csejava>javac

Interpretation:

D:\csejava>appletviewer framediv.java



*

Week:1-A

AIM:Write a program that implements client/server application.The client sends

data to the server.the server receives the data and result echo back to the client.

File name: echo.java

Source code:



import java.net.*;

import java.io.*;

public class echo

{

public static void main(String argv[])

{

Socket es=null;

PrintStream os=null;

DataInputStream is=null;

DataInputStream stdin=new DataInputStream(System.in);

try

{

es=new Socket("127.0.0.1",17);

is=new DataInputStream(es.getInputStream());

os=new PrintStream(es.getOutputStream());

}

catch (Exception e)

{

System.err.println(e);

}



if(es!=null && os!=null && is!=null)

{

try

{

String userip;

while((userip=stdin.readLine())!=null)

{

os.println(userip);

String serverip =is.readLine();

System.out.println("echo: " + serverip);

}

os.close();

is.close();

es.close();

}

catch(Exception e)

{

System.err.println(e);

}



}

}

}

File name: echoser.java

Source code:

import java.net.*;

public class echoser

{



public static void main(String args[])

{

ServerSocket ss=null;

try

{

System.out.println("Creating server socket");

ss=new ServerSocket(17);

System.out.println("Done");

}

catch(Exception e)

{

System.out.println(e);

}

while(true)

{

try

{

System.out.println("Waiting for a connection");

Socket s=ss.accept();

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

System.out.println("Passing the quote..");

InputStream is=s.getInputStream();



int ch;

while((ch=is.read())!=-1)

{

ps.print((char)ch);

System.out.print((char)ch);

}

ps.close();

is.close();

{

catch(Exception e)

{

System.out.println(e);

System.exit(0);

}

}

}

Out put:

COMPILATION:

D:\cse>javac echo.java



INTERPRETATON:

D:\cse>java echo

Compilation:

D:\cse>javac echoser.java

Interpretation:



D:/cse>java echoser

Week:1-A



AIM: write a java program that simulates trafficlight the program let user select

one of three lights ,thread yellowor green .when a radio button is select the light

is turn ed one light can be on at atime.

No lights is on when the program starts.

File name: Edit framelights.java

So urce code:


import java.awt.*;


class framelights implements ItemListener

{

Frame f;

Label l;

Checkbox b1,b2,b3;

CheckboxGroup g;

Panel p;

public void itemStateChanged(ItemEvent e)

{

Checkbox c=(Checkbox)e.getSource();

if(c.getLabel().equals("Red"))



{

l.setText("Red color...");

}

else

if(c.getLabel().equals("Yellow"))

{

l.setText("Yellow color...");

}

else

if(c.getLabel().equals("Green"))

{

l.setText("Green color...");

}

}

public framelights()

{

f=new Frame("Frame with Lights");

l=new Label("COLOR BOX.....");

g=new CheckboxGroup();

b1=new Checkbox("Red",g,false)



b2=new Checkbox("Yellow",g,false);

b3=new Checkbox("Green",g,false);

b1.addItemListener(this);



p=new Panel();

p.add(l);

p.add(b1);

p.add(b2);

p.add(b3);

f.add(p);

f.setSize(300,400);

f.setVisible(true);

}

public static void main(String[] args)

{

new framelights();

}

}



Output:

Compilation:

D:/cse>javac framelights.java

Interpretation:

D:/cse>java framelights



Week:1-A

AIM:Write a java program to draw a line,ellipse and rectangle.

Filename:edit appltdraw.java

Source code:


import java.awt.*;


public class appltdraw extends java.applet.Applet

{

public void init()

{

resize(250,250);

}


{

//orange rect

g.drawRect(100,100,300,450);



g.setColor(Color.orange);

g.fillRect(100,100,30,50);

//red line

g.setColor(Color.red);

g.drawLine(0,0,120,120);

//blue rect

g.setColor(Color.blue);

g.drawRect(100,100,30,50);

g.setColor(Color.green);

g.fillRect(150,150,30,50);

//gray oval

g.setColor(Color.gray);

g.drawOval(0,0,50,100);

}

}

\\applet code\\

/*

<applet code=appltdraw.class height=300 width=400>

</applet>

*/



Out put:

Compilation:

E:\ADITYA\csejava>javac appltdraw.java

Interpretation:

E:\ADITYA\csejava>appletviewer appltdraw.java



RAO & NAIDU ENGINEERING COLLEGE

LAB : Object Oriented Programming Class : II nd

C.S.E-A

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