可移动的 HelloWorld

package com.home.test;

import java.awt.Color;
import java.awt.Cursor;
import java.awt.Font;
import java.awt.Point;
import java.awt.event.MouseEvent;

import javax.swing.JLabel;
import javax.swing.JWindow;
import javax.swing.event.MouseInputListener;

public class GuiHelloWorld extends JWindow {
 private static final long serialVersionUID = 1L;
 JLabel titleLbl;
 Font GuiHelloWorldFont;

public GuiHelloWorld() {
  GuiHelloWorldFont = new Font("幼圆", Font.ITALIC, 28);
  
  this.getContentPane().setBackground(new Color(0x99FF66));
  this.setBounds(400, 200, 200, 60);
  this.setLayout(null);
  
  titleLbl = new JLabel(" Hello World!");
  titleLbl.setFont(GuiHelloWorldFont);
  titleLbl.setOpaque(true);
  titleLbl.setBackground(new Color(0x66CC00));
  titleLbl.setBounds(0, 0, 200, 60);
  this.add(titleLbl);
  
  // 鼠标事件处理类
  MouseEventListener mouseListener = new MouseEventListener(this);
  titleLbl.addMouseListener(mouseListener);
  titleLbl.addMouseMotionListener(mouseListener);
  this.setVisible(true);
 }

public static void main(String[] args) {
  new GuiHelloWorld();
 }
}

class MouseEventListener implements MouseInputListener {
 Point origin; // 鼠标拖拽想要移动的目标组件
 GuiHelloWorld frame;

public MouseEventListener(GuiHelloWorld frame) {
  this.frame = frame;
  origin = new Point();
 }

public void mouseClicked(MouseEvent e) {
  // TODO Auto-generated method stub

}

public void mousePressed(MouseEvent e) {
  // TODO Auto-generated method stub
  origin.x = e.getX();
  origin.y = e.getY();
 }

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

}

public void mouseEntered(MouseEvent e) {
  // TODO Auto-generated method stub
  this.frame.setCursor(Cursor.getPredefinedCursor(Cursor.MOVE_CURSOR));
 }

public void mouseExited(MouseEvent e) {
  // TODO Auto-generated method stub
  this.frame.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
 }

public void mouseDragged(MouseEvent e) {
  // TODO Auto-generated method stub
  Point p = this.frame.getLocation();
  this.frame.setLocation(p.x + (e.getX() - origin.x), p.y
    + (e.getY() - origin.y));
 }

public void mouseMoved(MouseEvent e) {
  // TODO Auto-generated method stub

}

}