swing添加和关闭类似位置的按钮并且响应事件

Question

如题：
具体效果图如下：

Answer 1

import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;import javax.swing.JLabel;
import javax.swing.JWindow;public class WindowTest extends JWindow { private JLabel closeLabel; public WindowTest() {
this.setSize(300, 50);
this.setLocationRelativeTo(null);
this.setAlwaysOnTop(false);
this.setLayout(new FlowLayout(FlowLayout.RIGHT)); closeLabel = new JLabel("X");// 放在右上角做关闭按钮
closeLabel.setFont(new Font("宋体", 0, 14));
closeLabel.addMouseListener(new MouseAdapter() { @Override
public void mouseClicked(MouseEvent e) {
// TODO Auto-generated method stub
super.mouseClicked(e);
System.exit(0);
} @Override
public void mouseEntered(MouseEvent e) {
super.mouseEntered(e);
closeLabel.setForeground(Color.red);
}

@Override
public void mouseExited(MouseEvent e) {
// TODO Auto-generated method stub
super.mouseExited(e);
closeLabel.setForeground(Color.BLACK);
}
});
this.add(closeLabel);
} @Override
public void paint(Graphics g) {
super.paint(g);
}

public static void main(String[] args) {
new WindowTest().setVisible(true);
}}

Answer 2

setExtendedState(Frame.ICONIFIED); // 最小化