GUI 실습 - button

import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

class Quiz extends JFrame implements MouseListener{
    private JButton btn;
    private JPanel panel;
    private Color[] cs = {Color.blue,Color.red,Color.yellow, Color.cyan};

    public Quiz(String name) {
        this.setSize(300,300);
        panel = new JPanel();
        panel.setSize(200,300);
        panel.setBackground(Color.gray);

        btn = new JButton(name);
        btn.setOpaque(true);
        btn.setBounds(10, 10, 200, 20);
        panel.add(btn);
        this.add(panel);

        btn.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e){
                System.out.println((int)(Math.random()*10%4));
                btn.setBackground(cs[(int)(Math.random()*10%3)]);
            }
        });


        panel.addMouseListener(this);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setVisible(true);
    }
    public void mouseClicked(MouseEvent e) {
        System.out.println(e.getX());
        System.out.println(e.getY());
        btn.setLocation(e.getX(), e.getY());
    }
    @Override
    public void mousePressed(MouseEvent e) {
        // TODO Auto-generated method stub

    }
    @Override
    public void mouseReleased(MouseEvent e) {
        // TODO Auto-generated method stub

    }
    @Override
    public void mouseEntered(MouseEvent e) {
        // TODO Auto-generated method stub

    }
    @Override
    public void mouseExited(MouseEvent e) {
        // TODO Auto-generated method stub

    }
}

public class QuizTest {
    public static void main(String[] args) {
        Quiz q = new Quiz("버튼이다다");
    }
}