Edit the below code to allow it to run as a Java Applet. Program should display

Question

Edit the below code to allow it to run as a Java Applet. Program should display a button that when clicked cycles through yellow and dark gray.

import java.awt.Color;
import java.awt.FlowLayout;
import javax.swing.JApplet;
import javax.swing.JButton;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class Training extends JApplet
{
   private Container contentHolder;

  
   public void start()
   {
       contentHolder=getContentPane();
       contentHolder.setBackgound(Color.white);
       final JButton jbt1=new JButton ("On/Off");
       final JButton jbt2=new JButton ("On/Off");
       jbt2.setVisible(false);
       contentHolder.setLayout(new FlowLayout());
       contentHolder.add(jbt1);
       contentHolder.add(jbt2);
      
       jbt1.addActionListener(new ActionListener(){
           public void actionPerformed(ActionEvent e) {
               contentHolder.setBackground(Color.darkGray);
               jbt1.setVisible(false);
               jbt2.setVisible(true);
           }
       });
      
       jbt2.addActionListener(new ActionListener(){
           public void actionPerformed(ActionEvent e) {
               contentHolder.setBackground(Color.yellow);
               jbt1.setVisible(true);
               jbt2.setVisible(false);
           }
       });
   }
}

Explanation / Answer

Hi, Please find the updated (highlighed) code to allow it to run as a Java Applet.

Training.java

import java.awt.Color;
import java.awt.FlowLayout;
import javax.swing.JApplet;
import javax.swing.JButton;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
/*
<applet code = "Training.class" width = "400" height="400"></applet>
*/
public class Training extends JApplet
{
private Container contentHolder;
  
public void start()
{
contentHolder=getContentPane();
contentHolder.setBackground(Color.white);
final JButton jbt1=new JButton ("On/Off");
final JButton jbt2=new JButton ("On/Off");
jbt2.setVisible(false);
contentHolder.setLayout(new FlowLayout());
contentHolder.add(jbt1);
contentHolder.add(jbt2);
  
jbt1.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
contentHolder.setBackground(Color.darkGray);
jbt1.setVisible(false);
jbt2.setVisible(true);
}
});
  
jbt2.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
contentHolder.setBackground(Color.yellow);
jbt1.setVisible(true);
jbt2.setVisible(false);
}
});
}
}

How to Execute:

> Save the above program into file with the name "Training.java"

> Open cmd prompt and go to the path where Training.java file has been saved.

> complite the java program by using below commands.

>javac Training.java

>appletviewer Training.java

Your applet will open and run. When clicked on button Yellow and Gray colors will appear.

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