Question

Hi, I need help with this Java GUI program. The instruction and code can be found below thanks.

This GUI is the start of a simple number entry GUI class. The program displays four Buttons and every time the user clicks on a button, the corresponding button label appears on the bottom of the GUI. As a hint, you might break up the design of the GUI into two parts: one part holds the buttons, the other holds the completed GUI. Also include a main ( ) to launch the GUI.

Add appropriate JavaDoc comments throughout your code.

package

/**
 * don't forget comments 
 */
/**
 * 
 * @author: put-your-name-here
 *
 */ 
 public class SimpleButtons implements ...... {

   private static final long serialVersionUID = 1L;

        SimpleButtons( ) {
   }  //constructor

        // event handler here
        public static void main( String args[ ] ) { 

   } // main here
}

Answer 1

import java.awt.event.*;

import javax.swing.*;
public class SimpleButtons implements ActionListener{
   final JLabel tf;
   public SimpleButtons (){
       JFrame f=new JFrame("Button Example");
   tf=new JLabel();
   tf.setBounds(200,300, 150,20);
  
   /**
   *
   * for buttons creation
   *
   */
   JButton b1=new JButton("Button1");
   JButton b2=new JButton("Button2");
   JButton b3=new JButton("Button3");
   JButton b4=new JButton("Button4");
  
   /**
   *
   * setting bounds for buttons
   *
   */
   b1.setBounds(50,100,80,30);
   b2.setBounds(150,100,80,30);
   b3.setBounds(250,100,80,30);
   b4.setBounds(350,100,80,30);
  
   /**
   *
   * adding actionListener for buttons
   *
   */
   b1.addActionListener(this);
   b2.addActionListener(this);
   b3.addActionListener(this);
   b4.addActionListener(this);
  
   /**
   *
   * adding buttons to frame
   *
   */
   f.add(b1);
   f.add(b2);
   f.add(b3);
   f.add(b4);
  
   f.add(tf);
   f.setSize(600,400);
   f.setLayout(null);
   f.setVisible(true);   
   }
  
   /**
   *
   * this is the main functionality which will print the label of the button pressed on another label
   *
   */
   @Override
   public void actionPerformed(ActionEvent e) {
tf.setText(e.getActionCommand());
   }
   public static void main(String[] args) {
   new SimpleButtons ();
   }
}

Button Example Button1 Button2 Button3 Button4 Button1