Question

Write a simple GUI-based Java program that may be used to control a washing machine. Use suitable Swing components to allow the washing machine operator to perform the following functions:

1. 1) Switch the machine on.

2. 2) Choose a temperature from a list.

3. 3) Spin speed selection buttons - can be 600, 800 or 1200 RPM.

4. 4) Display the current status of the wash cycle.

Show the top-level design of the GUI, including any Panels and related Layout Manager objects that you propose to use. For each of the components you’ve chosen above, write the code to construct the component, add the component to a container and then set up simple event handling for the component (for those that generate events). The event handlers need only print out a message indicating that they have been called.

Answer 1

WashingMachine.java

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;

public class WashingMachine implements ActionListener{
  
   JFrame frame;
   JButton btn1, btn2, btn3;
   JLabel label;
  
   public WashingMachine(){
       frame = new JFrame();
       frame.setSize(600, 300);
       frame.setVisible(true);
       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       frame.setLayout(new FlowLayout(FlowLayout.CENTER));
       btn1 = new JButton("600");
       btn1.setSize(60, 40);
       btn2 = new JButton("800");
       btn2.setSize(60, 40);
       btn3 = new JButton("1200");
       btn3.setSize(60, 40);
       label = new JLabel("Current Cycles: None");
       label.setSize(200, 40);
       frame.add(btn1);
       frame.add(btn2);
       frame.add(btn3);
       frame.add(label);
       btn1.addActionListener(this);
       btn2.addActionListener(this);
       btn3.addActionListener(this);
   }
  
   public static void main(String args[]){
       new WashingMachine();
   }

   @Override
   public void actionPerformed(ActionEvent e) {
       if(e.getActionCommand().equals("600")){
           label.setText("Current Cycles: 600");
           System.out.println("600 Cycles selected");
       }else if(e.getActionCommand().equals("800")){
           label.setText("Current Cycles: 800");
           System.out.println("800 Cycles selected");
       }else if(e.getActionCommand().equals("1200")){
           label.setText("Current Cycles: 1200");
           System.out.println("1200 Cycles selected");
       }
   }

}