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Java Examples - Create eventlistener in Applet


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Problem Description:

How to create an event listener in Applet?

Solution:

Following example demonstrates how to create a basic Applet having buttons to add & subtract two nos. Methods usded here are addActionListener() to listen to an event(click on a button) & Button() construxtor to create a button.

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

public class EventListeners extends Applet 
implements ActionListener{
   TextArea txtArea;
   String Add, Subtract;
   int i = 10, j = 20, sum =0,Sub=0;
   public void init(){
      txtArea = new TextArea(10,20);
      txtArea.setEditable(false);
      add(txtArea,"center");
      Button b = new Button("Add");
      Button c = new Button("Subtract");
      b.addActionListener(this);
      c.addActionListener(this);
      add(b);
      add(c);
   }
   public void actionPerformed(ActionEvent e){
      sum = i + j;
      txtArea.setText("");
      txtArea.append("i = "+ i + "\t" + "j = " + j + "\n");
      Button source = (Button)e.getSource();
      if(source.getLabel() == "Add"){
         txtArea.append("Sum : " + sum + "\n");
      }
      if(i >j){
         Sub = i - j;
      }
      else{
         Sub = j - i;
      }
      if(source.getLabel() == "Subtract"){
         txtArea.append("Sub : " + Sub + "\n");
      }
   }
}

Result:

The above code sample will produce the following result in a java enabled web browser.

View in Browser. 


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