Java Applet: ActionListener in java applets

 ActionListener in java applets

Program:

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

/*<applet code="ActionExample.java" width=300 height=500>
</applet>
*/

public class ActionExample extends Applet implements ActionListener 
{ 

     Button okButton; 
     Button wrongButton; 
     TextField nameField; 
     CheckboxGroup radioGroup; 
     Checkbox radio1; 
     Checkbox radio2; 
     Checkbox radio3; 

     public void init()  
     { 
          setLayout(new FlowLayout()); 
          okButton = new Button("Action!"); 
          wrongButton = new Button("Don't click!"); 
          nameField = new TextField("Type here Something",35); 
          radioGroup = new CheckboxGroup(); 
          radio1 = new Checkbox("Red", radioGroup,false); 
          radio2 = new Checkbox("Blue", radioGroup,true); 
          radio3 = new Checkbox("Green", radioGroup,false); 
          add(okButton); 
          add(wrongButton); 
          add(nameField); 
          add(radio1); 
          add(radio2); 
          add(radio3); 
          okButton.addActionListener(this); 
          wrongButton.addActionListener(this); 
         } 
         public void paint(Graphics g) 
         { 
          if (radio1.getState()) g.setColor(Color.red); 
        else if (radio2.getState()) g.setColor(Color.blue); 
          else g.setColor(Color.green); 

          g.drawString(nameField.getText(),20,100); 
     } 

 
        public void actionPerformed(ActionEvent evt)  
         { 
              if (evt.getSource() == okButton)  
                   repaint(); 

          else if (evt.getSource() == wrongButton)  
          { 

               wrongButton.setLabel("Not here!"); 
               nameField.setText("That was the wrong button!"); 
               repaint(); 
          } 
     }  

} 

Output: