2. Abstract Window Toolkit (AWT), Swing and Event Handling

2.1 Develop a program that has only one button in the frame, clicking on the button cycles through the colors: red->green->blue, and so on. One color changes per click.(usegetBackGround() method to get the current color)

ChangeColor.java

import java.awt.*;
import java.awt.event.*;
public class ChangeColor extends Frame implements ActionListener
{
    Button btnColor=new Button("Click to change");
    ChangeColor()
    {
        setLayout(new FlowLayout());
        add(btnColor);
        btnColor.addActionListener(this);
        setVisible(true);
        setSize(800,500);
    }
    public void actionPerformed(ActionEvent ae)
    {
        
        Color c=getBackground();
        if(c.equals(Color.white))
        {
            setBackground(Color.red);
        }
        else if(c.equals(Color.red))
        {
            setBackground(Color.green);
        }
        else if(c.equals(Color.green))
        {
            setBackground(Color.blue);
        }
        else
        {
            setBackground(Color.red);
        }
    }
    public static void main(String arg[])
    {
        ChangeColor c=new ChangeColor();
    }
    
}

Output



Run code to see proper output

Happy Coding