package testsystem;

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class first extends Frame implements ActionListener
{
    static first frm=new first();
    static Button bt1=new Button("變色");
    static Button  bt2=new Button("關閉");

    public static void main(String[] args)
    {
        frm.setLayout(new FlowLayout());
        frm.setSize(200,300);
        frm.setLocation(300,300);
        frm.add(bt1);
        frm.add(bt2);
        bt1.addActionListener(frm);
        bt2.addActionListener(frm);
        frm.setVisible(true);

    }


    public void actionPerformed(ActionEvent e)
    {
        if(e.getSource()==bt1)
        {
            if(frm.getBackground()==Color.cyan)
            frm.setBackground(Color.red);
            if(frm.getBackground()==Color.red)
            frm.setBackground(Color.cyan);
        }
        else
        {
            System.exit(0);
        }


    }
}