java programming lab

8/4/2019 Java Programming Lab

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SONA COLLEGE OF TECHNLOLOGY

DEPARTMENT OF COMPUTER SCIENCE & ENGINEERING

JAVA PROGRAMMING LAB MANUAL


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ABSTRACT CLASSES

PROGRAM

import java.io.*;

abstract class AreaMethods {

abstract void rect(int l,int b);

abstract void sqr(int a);

abstract void tri(int ba,int h);

}

class Area extends AreaMethods {

void rect(int l,int b) {

System.out.println("Area of the Rectangle : "+(l*b));

}

void sqr(int a) {

System.out.println("Area of the Square : "+(a*a));

}void tri(int ba,int h) {

System.out.println("Area of the Triangle : "+(0.5*ba*h));

}

}

class AbstractDemo {

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

int l,b,a,ba,h;

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

System.out.println("Enter the length of the Rectangle:");

l=Integer.parseInt(br.readLine());

System.out.println("Enter the breadth of the Rectangle:");

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

System.out.println("Enter the side of the Square:");


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a=Integer.parseInt(br.readLine());

System.out.println("Enter the base of the Triangle:");

ba=Integer.parseInt(br.readLine());

System.out.println("Enter the height of the Triangle:");

h=Integer.parseInt(br.readLine());

Area obj=new Area();

obj.rect(l,b);

obj.sqr(a);

obj.tri(ba,h);

}

}

OUTPUT

Z:\cs2k944> javac AbstractDemo.java

Z:\cs2k944> java AbstractDemo

Enter the length of the Rectangle:

4

Enter the breadth of the Rectangle:

3

Enter the side of the Square:

4

Enter the base of the Triangle:

5

Enter the height of the Triangle:

6

Area of the Rectangle : 12

Area of the Square : 16

Area of the Triangle : 15.0


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INHERITANCE

PROGRAM

abstract class Worker {

String name;

double rate;

Worker(String n, double r) {

name = n;

rate = r;

}

double getRate() {

return rate;

}

abstract double computePay(int hours);

}

class HourlyWorker extends Worker {

double pay;

HourlyWorker(String n, double r) {super(n, r);

}

double computePay(int hours)

{

if(hours 40)

pay = (getRate()*40) + (getRate() * (hours - 40) / 2);

return pay;

}

}

class SalariedWorker extends Worker {

SalariedWorker(String n, double r) {


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super(n, r);

}

double computePay(int hours) {

return getRate() * 40;

}

}

class WorkerTester {

public static void main(String[] args) {

SalariedWorker s = new SalariedWorker("Sally", 40);

HourlyWorker h = new HourlyWorker("Harry", 40);

System.out.println(s.computePay(30));

System.out.println(h.computePay(30));

System.out.println(s.computePay(50));

System.out.println(h.computePay(50));

}

}

OUTPUT

Z:\cs2k940> javac WorkerTester.javaZ:\cs2k940> java WorkerTester

1600.0

1200.0

1600.0

1800.0


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INTERFACES

PROGRAM

1. Write a java program using interface to find the GCD & LCM of two numbers.

import java.io.*;

interface GLInterface {

int getGCD(int a,int b);

int getLCM(int a,int b);

}

class GLClass implements GLInterface {

public int getGCD(int a,int b) {

if(b==0)

return a;

else

return getGCD(b,a%b);}

public int getLCM(int a,int b) {

return((a*b)/getGCD(a,b));

}

}

class GL {


int a,b;


GLClass obj=new GLClass();

System.out.println("Enter the first number:");

a=Integer.parseInt(br.readLine());

System.out.println("Enter the second number:");


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

System.out.println("GCD = "+obj.getGCD(a,b));

System.out.println("LCM = "+obj.getLCM(a,b));

}

}

OUTPUT

Z:\cs2k944> javac GL.java

Z:\cs2k944> java GL

Enter the first number:

24Enter the second number:

12

GCD = 12

LCM = 24

2. Write the java program using interface to do the following

a) Binary to Decimalb) Decimal to Binaryc) Twos Complement of a Binary numberd) Addition of two Binary numbers

import java.io.*;

interface BinaryInterface {

int toDecimal(String binary);

String toBinary(int decimal);

String twosComplement(String binary);

String binaryAdd(String binary1,String binary2);

}


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class BinaryClass implements BinaryInterface {

public int toDecimal(String binary) {

return(Integer.parseInt(binary,2));

}

public String toBinary(int decimal) {

return(Integer.toBinaryString(decimal));

}

public String binaryAdd(String binary1,String binary2) {

return(Integer.toBinaryString(Integer.parseInt(binary1,2)+Integer.parseInt(binary2,2)));

}

public String twosComplement(String binary) {

int i=Integer.parseInt(binary,2);

int j=~i+1;

return(Integer.toBinaryString(j));

}

}

class Binary {



BinaryClass bc=new BinaryClass();

System.out.println("BINARY TO DECIMAL");

System.out.println("Enter the binary number:");

System.out.println("Binary-->Decimal = "+bc.toDecimal(br.readLine()));

System.out.println("DECIMAL TO BINARY");

System.out.println("Enter the decimal number:");

System.out.println("Decimal-->Binary = " + bc.toBinary (Integer.parseInt(br.readLine())));

System.out.println("TWO'S COMPLEMENT");

System.out.println("Enter the binary number:");

System.out.println("Two's Complement = "+bc.twosComplement(br.readLine()));

System.out.println("ADDITION OF TWO BINARY NUMBERS");

System.out.println("Enter two binary numbers:");


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System.out.println("Addition Result = " + bc.binaryAdd (br.readLine() ,

br.readLine()));

}

}

OUTPUT

Z:\cs2k944> javac Binary.java

Z:\cs2k944> java Binary

BINARY TO DECIMAL

Enter the binary number:

0101

Binary-->Decimal = 5

DECIMAL TO BINARY

Enter the decimal number:

15

Decimal-->Binary = 1111

TWO'S COMPLEMENT

Enter the binary number:

0001

Two's Complement = 11111111111111111111111111111111ADDITION OF TWO BINARY NUMBERS

Enter two binary numbers:

0101

0010

Addition Result = 111

3. Write a java program using interface to implement Queue

import java.io.*;

interface QueueInterface {

void insert(int item);

void delete();


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void display();

}

class QueueClass implements QueueInterface {

int size=5;

int que[];

int rear,front;

QueueClass() {

que=new int[size];

rear=0;

front=0;

}

public void insert(int x) {

if(rear>=size)

System.out.println("QUEUE IS FULL");

else {

que[rear]=x;

rear++;

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

}}

public void delete() {

if(front==rear)

System.out.println("QUEUE IS EMPTY");

else {

front++;

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

}

}

public void display() {

if(front==rear)

System.out.println("QUEUE IS EMPTY");

else {


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System.out.println("Elements in the Queue are");

for(int i=front;i


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System.exit(0);

default:

System.out.println("Wrong Choice!!!");

}

}while(true);

}

}

OUTPUT

Z:\cs2k944> javac Queue.java

Z:\cs2k944> java Queue

MENU

1. Insert into the Queue

2. Delete from the Queue

3. Display Queue

4. Exit

Enter the choice:

1

Enter the element to be inserted:5

Element Inserted

MENU



3. Display Queue

4. Exit

Enter the choice:

1

Enter the element to be inserted:

4

Element Inserted

MENU


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3. Display Queue

4. Exit

Enter the choice:

3

Elements in the Queue are

5 4

MENU



3. Display Queue

4. Exit

Enter the choice:

2

Element Deleted

MENU



3. Display Queue4. Exit

Enter the choice:

2

Element Deleted

MENU



3. Display Queue

4. Exit

Enter the choice:

2

QUEUE IS EMPTY


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MENU



3. Display Queue

4. Exit

Enter the choice:

4


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EVENT HANDLING USING APPLETS

PROGRAM

1. Design an Applet program to perform MouseEvent.

import java.awt.*;

import java.applet.*;

import java.awt.event.*;

/*

*/

public class MouseEventDemo extends Applet implements

MouseListener,MouseMotionListener {

String msg="";

public void init() {

setFont(new Font("Arial",Font.BOLD,18));

addMouseListener(this);

addMouseMotionListener(this);

}

public void mouseClicked(MouseEvent e) {

msg="Mouse Clicked";

repaint();

}

public void mouseEntered(MouseEvent e) {

msg="Mouse Entered";repaint();

}

public void mouseExited(MouseEvent e) {

msg="Mouse Exited";

repaint();


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}

public void mousePressed(MouseEvent e) {

msg="Mouse Pressed";

repaint();

}

public void mouseReleased(MouseEvent e) {

msg="Mouse Released";

repaint();

}

public void mouseDragged(MouseEvent e) {

msg="Mouse Dragged";

repaint();

}

public void mouseMoved(MouseEvent e) {

msg="Mouse Moved";

repaint();

}

public void paint(Graphics g) {

g.drawString(msg,120,150);

}}

OUTPUT

Z:\cs2k944> javac MouseEventDemo.java

Z:\cs2k944> AppletViewer MouseEventDemo.java


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2. Design an Applet program to perform Arithmetic Calculations.


import java.awt.*;


/*

*/

public class Calculation extends Applet implements ActionListener {

TextField t1,t2;

Label l1,l2,l3,l4;

Button add,sub,mul,div,mod;

double res;

int res1;



l1=new Label("Enter 1st Operand: ");

l2=new Label("Enter 2nd Operand: ");

t1=new TextField(25);t2=new TextField(25);

l3=new Label("Result: ");

l4=new Label(" ");

add=new Button("Addition");

sub=new Button("Subtraction");

mul=new Button("Multiplication");

div=new Button("Division");

mod=new Button("Modulus");

add(l1);

add(t1);

add(l2);

add(t2);

add(add);


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add(sub);

add(mul);

add(div);

add(mod);

add(l3);

add(l4);

add.addActionListener(this);

sub.addActionListener(this);

mul.addActionListener(this);

div.addActionListener(this);

mod.addActionListener(this);

}

public void actionPerformed(ActionEvent ae) {

String x=ae.getActionCommand();

if(x.equals("Addition")) {

res=(Double.parseDouble(t1.getText()))+(Double.parseDouble(t2.getText()));

l4.setText(""+res);

}

if(x.equals("Subtraction")) {

res=(Double.parseDouble(t1.getText()))-(Double.parseDouble(t2.getText()));

l4.setText(""+res);

}

if(x.equals("Multiplication")) {

res=(Double.parseDouble(t1.getText()))*(Double.parseDouble(t2.getText()));

l4.setText(""+res);

}

if(x.equals("Division")) {

res=(Double.parseDouble(t1.getText()))/(Double.parseDouble(t2.getText()));

l4.setText(""+res);

}


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if(x.equals("Modulus")) {

res1=(Integer.parseInt(t1.getText()))%(Integer.parseInt(t2.getText()));

l4.setText(""+res1);

}

}

}

OUTPUT

Z:\cs2k944> javac Calculation.java

Z:\cs2k944> AppletViewer Calculation.java

3. Design an Applet program to find Fibonacci Series and Factorial of a number.

import java.awt.*;



/*

*/

public class Fibo_Fact extends Applet implements ActionListener {

Label l1;


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TextField t1;

Button fact,fibo;

int fac,fibo1,fibo2,fibon,n;

String msg;



msg="";

l1=new Label("Enter the number:");

t1=new TextField(10);

fact=new Button("Factorial");

fibo=new Button("Fibonacci");

add(l1);

add(t1);

add(fact);

add(fibo);

fact.addActionListener(this);

fibo.addActionListener(this);

}

public void actionPerformed(ActionEvent ae) {Object x=ae.getSource();

if(x==fact) {

msg="";

fac=1;

int n=Integer.parseInt(t1.getText());

for(int i=1;i


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fibo1=0;

fibo2=1;

for(int i=0;i javac Fibo_Fact.java

Z:\cs2k944> AppletViewer Fibo_Fact.java


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THREADS ( SINGLE AND MULTIPLE )

PROGRAM

1. Write a program WordCount that counts the words in one or more files. Start a

new thread for each file.

import java.io.*;

class FileThread implements Runnable {

String Filename;String name;

Thread t;FileThread(String tname) {

Filename=tname;name=tname;

t=new Thread(this,name);t.start();

}public void wordCount() {

try

{ StreamTokenizer input=new StreamTokenizer(newFileReader(Filename));

int tok=0;int count=0;

while((tok=input.nextToken())!= StreamTokenizer.TT_EOF)if(tok == StreamTokenizer.TT_WORD)

count++;System.out.println(Filename+": "+count);

}catch(IOException e) {}

}public void run() {

wordCount();}

}

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


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if(args.length ==0) {

System.out.println("Give the File Name in the Command Line...");

System.exit(0);}

else {

for(int i=0;i javac FileWordCounter.java

Z:\cs2k944> java FileWordCounter City.txt Subject.txt Project.txt

City.txt: 3

Subject.txt: 11

Project.txt: 11


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2. Write a java program that creates three threads. First thread displays Good

Morning every one second, the second thread displays Hello every two seconds

and the third thread displays Welcome every three seconds.

class MultiThreadClass implements Runnable {String name;

Thread t;int sec;

MultiThreadClass(String threadname,int millisec) {

name = threadname;sec=millisec;

t = new Thread(this, name);t.start();

}

public void run() {try{

for(int i=5;i>0;i--){

System.out.println(name);Thread.sleep(sec);

}}

catch(InterruptedException e){}

}}

class MultiThreadDisplay

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

{new MultiThreadClass("Good Morning",1000);

new MultiThreadClass("Hello",2000);new MultiThreadClass("Welcome",3000);

Thread.sleep(10000);}

}


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OUTPUT

Z:\cs2k944> javac MultiThreadDisplay.java

Z:\cs2k944> java MultiThreadDisplay

Good Morning

Hello

Welcome

Good Morning

Hello

Good Morning

Welcome

Good Morning

Hello

Good Morning

Hello

Welcome

Hello

Welcome

Welcome

3. Write a java program that correctly implements producer consumer problem

using the concept of inter thread communication.

class Consumer implements Runnable {

Stock c;

Thread t;

Consumer(Stock c) {

this.c=c;

t=new Thread(this,"Consumer Thread");

t.start();

}

public void run() {

while(true) {


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try

{

t.sleep(750);

}catch(InterruptedException e) {}

c.getStock((int) (Math.random()*20));

}

}

void stop() {

t.stop();

}

}

class Producer implements Runnable {

Stock s;

Thread t;

Producer(Stock s) {

this.s=s;

t=new Thread(this,"Producer Thread");

t.start();

}

public void run() {while(true) {

try

{

t.sleep(750);


s.addStock((int)(Math.random()*20));

}

}

void stop() {

t.stop();

}

}


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public class Stock {

int goods=0;

public synchronized void addStock(int i) {

if((goods+i)=j) {

goods-=j;

System.out.println("\nRequested Stock -> "+j);

System.out.println("STOCK TAKEN AWAY :"+j);

System.out.println("Present Stock :"+goods);

break;}

else {

System.out.println("\nRequested Stock -> "+j);

System.out.println("Stock Not Enough...");

System.out.println("Waiting For Stock To Come...");

try

{ wait();


}

}

return goods;

}


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public static void main(String args[]) {

Stock j=new Stock();

Producer p=new Producer(j);

Consumer c=new Consumer(j);

try

{

Thread.sleep(5000);

p.stop();

c.stop();

p.t.join();

c.t.join();

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


System.exit(0);

}

}

OUTPUT

Z:\cs2k944> javac Stock.java

Z:\cs2k944> java Stock

STOCK ADDED :17

Present Stock :17

Requested Stock -> 4

STOCK TAKEN AWAY :4

Present Stock :13

STOCK ADDED :7

Present Stock :20



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STOCK TAKEN AWAY :13

Present Stock :7

STOCK ADDED :12

Present Stock :19



Present Stock :1

STOCK ADDED :14

Present Stock :15



Present Stock :0

STOCK ADDED :18

Present Stock :18


STOCK TAKEN AWAY :7

Present Stock :11

Stock cannot be added since it exceeds the limits


STOCK TAKEN AWAY :7

Present Stock :4

THREAD STOPPED


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SWINGS

PROGRAM

1. Write a program to plot the string HELLO, using only lines and circles. Do not

call drawstring, and do not use System.out. Make classes LetterH, LetterE, LetterL,

and LetterO.

import java.awt.*;

import javax.swing.*;

class LetterH extends JPanel {

public void paintComponent(Graphics g) {

Graphics2D g2d=(Graphics2D)g;

g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.

VALUE_ANTIALIAS_ON);

g2d.setStroke(new BasicStroke(8));

g2d.drawLine(10,10,10,50);

g2d.drawLine(10,27,40,27);

g2d.drawLine(40,10,40,50);

}}

class LetterE extends JPanel {






g2d.drawLine(10,10,10,50);g2d.drawLine(10,10,40,10);

g2d.drawLine(10,27,40,27);

g2d.drawLine(10,50,40,50);

}

}


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class LetterL extends JPanel {






g2d.drawLine(10,10,10,50);

g2d.drawLine(10,50,40,50);

}

}

class LetterO extends JPanel {






g2d.drawOval(10,10,40,40);

}

}

class Hello {


JFrame f=new JFrame("Hello Frame");

f.setLayout(new GridLayout(1,5));

f.add(new LetterH());

f.add(new LetterE());

f.add(new LetterL());

f.add(new LetterL());

f.add(new LetterO());

f.setVisible(true);

f.setSize(300,100);

f.setLocation(100,100);

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}}


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OUTPUT

Z:\cs2k944> javac Hello.java

Z:\cs2k944> java Hello

2. Write a program that displays the Olympic rings. Color the rings in the Olympic

colors. Provide a class OlympicRing and a class OlympicRingsTest.

import java.awt.*;

import javax.swing.*;

class OlympicRings extends JPanel {



g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);


g2d.setFont(new Font("Arial",Font.BOLD,30));

g2d.drawString("OLYMPIC RINGS",140,100);

g2d.setColor(Color.blue);

g2d.drawOval(100,200,100,100);

g2d.setColor(Color.black);

g2d.drawOval(208,200,100,100);g2d.setColor(Color.red);

g2d.drawOval(316,200,100,100);

g2d.setColor(Color.yellow);

g2d.drawOval(150,250,100,100);

g2d.setColor(Color.green);


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g2d.drawOval(258,250,100,100);

}

}

class OlympicRingsTest {


JFrame f=new JFrame("Olympic Rings");

f.setVisible(true);

f.setSize(550,550);

f.setLocation(100,100);

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

f.add(new OlympicRings());

}

}

OUTPUT

Z:\cs2k944> javac OlympicRingsTest.java

Z:\cs2k944> java OlympicRingsTest


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FILE HANDLING AND I/O HANDLING

PROGRAM

1. Write a program to read the content of a file.

import java.io.*;

class FileRead {


try{

String strLine,filename;

BufferedReader br=new BufferedReader(new InputStreamReader

(System.in));

System.out.println("Enter the filename:");

filename=br.readLine();

FileInputStream fstream = new FileInputStream(filename);

BufferedReader inFile = new BufferedReader(new InputStreamReader(fstream));

System.out.println("File Contents:");

while ((strLine = inFile.readLine()) != null) {

System.out.println (strLine);

}

}

catch(Exception e) {

System.err.println("Error: " + e.getMessage());

}

}

}

Content.txt

Java Programming

C Programming

C++ Programming


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OUTPUT

Z:\cs2k944> javac FileRead.java

Z:\cs2k944> java FileRead

Enter the filename:

Content.txt

File Contents:

Java Programming

C Programming

C++ Programming

2. Write a program to write a content to a file.

import java.io.*;

public class FileWrite {


try {

String k,filename;

BufferedReader br=new BufferedReader(new InputStreamReader

(System.in));

System.out.println("Enter the Filename:");


File outFile = new File(filename);

PrintStream out=new PrintStream(outFile);

System.out.println("Enter the content of the file :");

while(true) {

if((k=br.readLine()).equalsIgnoreCase("stop")) {

System.out.println("Content to a file is wrote

successfully");

break;

}


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else

out.println(k);

}

} catch (IOException e){}

}

}

OUTPUT

Z:\cs2k944> javac FileWrite.java

Z:\cs2k944> java FileWrite

Enter the Filename:

Contents.txt

Enter the content of the file :

Software Engineering

Computer Networks

Theory of Computation

Stop

Content to a file is wrote successfully

Contents.txt

Software Engineering

Computer Networks

Theory Of Computation

3. Write a Program to search a number of occurrences of a particular

character in a file.

import java.io.*;

class CharSearch {


String filename;

char searchChar;


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int count=0,fileChar;


try{



FileInputStream in = new FileInputStream(filename);

System.out.println("Enter the Character to be searched:");

searchChar=(char)System.in.read();

while ((fileChar = in.read()) != -1) {

if((char)fileChar==searchChar)

count++;

}

if(count==0)System.out.println("The searched character is not present in the file");

else

System.out.println(searchChar+" exists "+count+" times in the file");

}

catch(Exception e) {}

}

}

Content.txt

Java Programming

C Programming

C++ Programming

OUTPUT

Z:\cs2k944> javac CharSearch.java

Z:\cs2k944> java CharSearch

Enter the filename:

Content.txt

Enter the Character to be searched:

m

m exists 6 times in the file


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4. Write a Program to search a number of occurrences of a particular word in

a file.

import java.io.*;

class WordSearch {


String strLine,filename,word;

int count=0;


try{



FileInputStream fstream = new FileInputStream(filename);

BufferedReader inFile = new BufferedReader(new InputStreamReader(fstream));

System.out.println("Enter the word to be searched:");

word=br.readLine();

while ((strLine = inFile.readLine()) != null) {

String[] strarr = strLine.split(" ");

for(String str:strarr) {

if(str.equalsIgnoreCase(word))count++;

}

}

if(count==0)

System.out.println("The searched word is not present in the file");

else

System.out.println(word+" exists "+count+" times in the file");

}

catch(Exception e)

{}

}

}


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Content.txt

Java Programming

C Programming

C++ Programming

OUTPUT

Z:\cs2k944> javac WordSearch.java

Z:\cs2k944> java WordSearch

Enter the filename:

Content.txt

Enter the word to be searched:Programming

Programming exists 3 times in the file


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DATABASE APPLICATIONS (JDBC )

PROGRAM

1. Write a program to establish JDBC connectivity between a java program and a

database.

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

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

class BankDatabase extends JFrame implements ActionListener {JButton b1,b2;JLabel l1,l2,l3,l4;

private static Connection con=null;private static Statement st=null;

private static ResultSet rs=null;String acc,amt;

int bal,i;BankDatabase(String acc) {

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

con=DriverManager.getConnection("jdbc:odbc:bank","","");st=con.createStatement();

this.acc=acc;bal=balance(st);

}catch(Exception e) {

JOptionPane.showMessageDialog(null,e.getMessage() , "ERRORMESSAGE", 1);

System.exit(0);}

l1=new JLabel("Account No. :");l2=new JLabel("Balance :");

l3=new JLabel(acc);l4=new JLabel(""+bal);

b1=new JButton("Deposit");b2=new JButton("Withdraw");

setLayout(null);l1.setBounds(50,20,100,20);

l2.setBounds(50,50,100,20);


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l3.setBounds(180,20,150,20);l4.setBounds(180,50,150,20);

b1.setBounds(30,100,100,20);b2.setBounds(150,100,100,20);

add(l1);

add(l2);add(l3);add(l4);

add(b1);add(b2);

b1.addActionListener(this);b2.addActionListener(this);

setVisible(true);setTitle("Transaction");

setSize(300,200);setLocation(175,200);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);}

public void actionPerformed(ActionEvent ae) {if(ae.getSource()==b1) {

deposit(st);}

if(ae.getSource()==b2) {withdraw(st);

}}

public int balance(Statement st) {try {

rs=st.executeQuery("select balance from bank where accno='"+acc+"'");while(rs.next()) {

i++;bal=Integer.parseInt(rs.getString(1));

}if(i==0) {

JOptionPane.showMessageDialog(null,"Account No. does notExit","ERROR MESSAGE", 1);

System.exit(0);}

}catch(SQLException se) {

JOptionPane.showMessageDialog(null,se.getMessage(),"ERRORMESSAGE", 1);

System.exit(0);}

return bal;}


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public void withdraw(Statement st) {

try {

amt = JOptionPane.showInputDialog(null, "Enter the Amount to withdraw: ", "Amount to withdraw", 1);

if(amt!=null) {

bal-=Integer.parseInt(amt);st.executeUpdate("update bank set balance='" +Integer.toString(bal) +"' where accno='"+acc +"'");

JOptionPane.showMessageDialog(null, "Transaction Successful!","Message",1);

l4.setText(""+bal);}

elseJOptionPane.showMessageDialog(null, "You pressed cancel

button", "Message", 1);}

catch(SQLException se) {JOptionPane.showMessageDialog(null,se.getMessage(),"ERROR

MESSAGE", 1);}

}public void deposit(Statement st) {

try {amt = JOptionPane.showInputDialog(null, "Enter the Amount to Deposit :

", "Amount to Deposit", 1);if(amt!=null) {

bal+=Integer.parseInt(amt);st.executeUpdate("update bank set

balance='"+Integer.toString(bal)+"' where accno='"+acc+"'");JOptionPane.showMessageDialog(null,"Transaction Successful!",

"Message",1);l4.setText(""+bal);

}else

JOptionPane.showMessageDialog(null, "You pressed cancelbutton", "Message", 1);

}catch(SQLException se) {

JOptionPane.showMessageDialog(null,se.getMessage(),"ERRORMESSAGE", 1);

}}

}


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class Bank {


String str = JOptionPane.showInputDialog(null, "Enter the Account Number : ","Account Number", 1);

if(str != null) {

new BankDatabase(str);}else

JOptionPane.showMessageDialog(null, "You pressed cancel button","Message", 1);

}}

OUTPUT

Z:\cs2k944> javac Bank.java

Z:\cs2k944> java Bank


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java programming lab

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