java applet problem

java applet problem

i was doing a program using java applet. I want to make a simple calculator. So i added four labels,textboxes. And 6 buttons for add,multiply,divide,minus and a clear and exit button to clear the textboxes and to exit from the applet respectively.Now i want to display a message when the user clicks the add button after entering the nos in the textboxes. And the this will have to change everytime the user clicks in the various buttons. Suppose i hv entered four nos in the textboxes and i pressed the Add button then a message that 'the addition of four nos is' should be displayed. And i click the minus button then a message that Subtraction of four nos is' should be displayed. It means that a string should always change its content depending upon the action performed by the user. Please help me to solve this.
Thanks.
View Answers

January 25, 2010 at 11:34 AM

Hi Friend,

Try the following code:

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

public class Calculator extends Applet implements ActionListener{
TextField text1,text2,text3,text4;
Label l1,l2,l3,l4;
Label lab;
Panel p;
String Add, Subtract,Multiply,Divide,Clear,Exit;
public void init(){

text1 = new TextField(12);
text2= new TextField(12);
text3 = new TextField(12);
text4 = new TextField(12);
l1=new Label("Enter Number 1:");
l2=new Label("Enter Number 2:");
l3=new Label("Enter Number 3:");
l4=new Label("Enter Number 4:");
lab=new Label();
p=new Panel(new GridLayout(1,3));
Panel p1=new Panel(new GridLayout(7,2));
Panel p2=new Panel(new GridLayout(1,1));
Button add = new Button("Add");
Button sub = new Button("Subtract");
Button mul = new Button("Multiply");
Button div = new Button("Divide");
Button clear = new Button("Clear");
Button exit = new Button("Exit");
add.addActionListener(this);
sub.addActionListener(this);
mul.addActionListener(this);
div.addActionListener(this);
clear.addActionListener(this);
exit.addActionListener(this);
p1.add(l1);
p1.add(text1);
p1.add(l2);
p1.add(text2);
p1.add(l3);
p1.add(text3);
p1.add(l4);
p1.add(text4);
p1.add(add);
p1.add(sub);
p1.add(mul);
p1.add(div);
p1.add(clear);
p1.add(exit);
p2.add(lab);
p.add(p1);
p.add(p2);
add(p);
}
public void actionPerformed(ActionEvent e){
String value1=text1.getText();
int num1=Integer.parseInt(value1);
String value2=text2.getText();
int num2=Integer.parseInt(value2);
String value3=text3.getText();
int num3=Integer.parseInt(value3);
String value4=text4.getText();
int num4=Integer.parseInt(value4);
Button source = (Button)e.getSource();
if(source.getLabel() == "Add"){
int cal=num1+num2+num3+num4;
lab.setText("Addition of four numbers is: "+cal);
}
if(source.getLabel() == "Subtract"){
int cal=num1-num2-num3-num4;
lab.setText("Subtraction of four numbers is: "+cal);
}
if(source.getLabel() == "Multiply"){
int cal=num1*num2*num3*num4;
lab.setText("Multiplication of four numbers is: "+cal);
}
if(source.getLabel() == "Divide"){
int cal=num1/num2;
lab.setText("Division of two numbers is: "+cal);
}
if(source.getLabel() == "Clear"){
text1.setText("");
text2.setText("");
text3.setText("");
text4.setText("");

}
if(source.getLabel() == "Exit"){
}
}
}

Thanks









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