Mousumi
java applet problem
1 Answer(s)      5 years and 4 months ago
Posted in : Applet
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.
Advertisement
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









Related Tutorials/Questions & Answers:
java applet problem - Applet
java applet problem  i was doing a program using java applet. I want... and to exit from the applet respectively.Now i want to display a message when...*; import java.awt.*; public class Calculator extends Applet implements
applet problem - Applet
applet problem  How can I create a file in client side by a java applet . Surely it will need a signed applet .But how can a signed applet create a file in the client side
Advertisements
problem with applet plugin - Applet
problem with applet plugin  hello friends, iam using Eclipse IDE. i created one applet and i want to plugin that applet into webpage.. when i am...-->com.ezsoft.applets.Upload.java please friends how can i resolve that problem
Problem in show card in applet.
Problem in show card in applet.  The following link contained the card demo with applet. http://www.roseindia.net/java/java... On Run as Java Applet then only show the Applet, not show any one card,hence any
Problem with display of images in applets - Applet
, this); } } --------------------------------------- Display image in Java Applet... information. http://www.roseindia.net/java/example/java/applet...Problem with display of images in applets  Hi all, When I run
Moving Applet Problem
Moving Applet Problem  When image scroll in applet then a blinking on image is continuously working.how to remove this blinking.. import... java.awt.Image; public class PlaneAnimation extends Applet implements Runnable
java applet - Applet
java applet  wants to creat address bar on my java applet.  Hi Applet don't provide a facility to create a address bar directly. You just create a text box. In this text box if you enter any http address
loading Java Applet - Applet
loading Java Applet  Hi, I use the archive tag to download my applet into the Browser It takes too long to load. Can I do it in several steps... control the loading within the applet? thanks
Java Applet
Java Applet   How to add Image in Java Applet? what is getDocumentBase
java applet - Applet
java applet  I want to close applet window which is open by another button of applet program. plz tell me!   Hi Friend, Try...://www.roseindia.net/java/example/java/applet/ Thanks
java - Applet
java  how to connect database table with scrollbar in java applet
java - Applet
java  how to connect database table with scrollbar in java applet
java - Applet
java  what is applet?  Hi Friend, Please visit the following link: http://www.roseindia.net/java/example/java/applet/ Thanks
java applet
java applet  why java applet programs doesn't contain main method
java applet
java applet  why java applet programs doesn't contain main method
java applet
java applet  If i insert in database from applet this work, but from applet.html don't
Java applet
Java applet   How do I go from my applet to another JSP or HTML page
Java applet
Java applet  What tags are mandatory when creating HTML to display an applet
Java Applet
Java Applet  Hi, What is Java Applet and how it can be useful in development of Java programs? Can anyone tell me the url to learn Java Applet? Thanks   Hi, See the tutorial at: Applications and Applets Thanks
java - Applet
java  what is applet
java - Applet
java  how to communicate to my servlet through applet.   ... this information to the servlet in the normal way. The applet pretends... is concerned, the applet is just another HTTP client. For more infomation
java applet
java applet   I want code to implement (1) user will enter how many nodes (2)it should allow that no. of clicks and circle should be displayed at that position
java applet
java applet  Creation of Applet for Personal Details Form When a customer places his first order of garments, the Personal Details Form is displayed.... The applet must include the following validations: ? The FirstName, Address1
java - Applet
java  i have button browse button in my applet form.when i click on browse button i have to go to file storage box(what ever files stored in my... in the mail).i have display that file path in my applet form.am learner please send me
java - Applet
java  1.An applet program to draw a line graph for y=2x+5.[for suitable values of x & y] 2. An applet program to draw following shapes (1)cone... java.applet.Applet; public class CubeExample extends Applet { Stroke
java applet prog
java applet prog  applet to display scrolling text from right to left in an applet window using thread. text should be accepted by html parameter
Java applet
Java applet  what are types of applets
Java applet
Java applet  What is AppletStub Interface
Java applet
Java applet   How are the differences between Applets and Applications
Java applet
Java applet  What is the relationship between the Canvas class and the Graphics class
Java applet
Java applet  What is the relationship between the Canvas class and the Graphics class