软件工程——移动的HelloWorld

package disiti;
	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
	}
	}