Question

Write Java code which will create a GUI window on screen. The window has one button: Doggy. When the user selects Doggy, “Bow Bow” should be printed on screen. Justify your syntax.

Answer 1

CODE IS PROVIDED WITH COMMENTS

CODE:

import javax.swing.*;        //importing all the classes from swing
import java.awt.*;           //importing all the classes from awt
import java.awt.event.*;     //importing all the classes from sub package event 

public class Doggy implements ActionListener           //implementing the interface ActionListener
{
 Frame f;
 Button b;          //creating the instances
 Label label;
Doggy()                 //constructor of Doggy class
{
 f=new Frame("Button");    //giving a name to the frame
 b=new Button("Doggy");    //giving a name to the button
 label=new Label();        
f.add(b);                  //adding the button object to frame
f.add(label);              //adding the label to the frame
b.addActionListener(this);    
f.setLayout(new FlowLayout(FlowLayout.CENTER,50,20));    //setting the layout 
f.setSize(300,200);                                      //setting the frame dimensions
f.setVisible(true);                                      //making it visible
}

public void actionPerformed(ActionEvent ae)             //method to create an action to the button
{ 
 if(ae.getActionCommand().equals("Doggy"))
 {
  label.setText("BOW BOW");                             //setting an action to get printed
  f.add(label);                                         //adding that label to the frame
  f.setVisible(true);
 }
}
public static void main(String args[])                   //main method 
{
  new Doggy();
}
}
 

OUTPUT: