package net.csdn.www;

import java.awt.Point;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.event.MouseInputAdapter;

public class RemoveTitle {
    public static void main(String[] args) {
        new NoTitleWindow();
    }
}

class NoTitleWindow extends JFrame {

    public NoTitleWindow() {
        setUndecorated(true);
        setBounds(100, 100, 100, 100);
        setVisible(true);
        MouseOperate mo = new MouseOperate();
        addMouseListener(mo);
        addMouseMotionListener(mo);
    }
    
    private class MouseOperate extends MouseInputAdapter {
        private Point point1;

        public void mousePressed(MouseEvent e) {
            point1 = e.getPoint();
        }

        public void mouseDragged(MouseEvent e) {
            Point point2 = new Point();
            point2 = e.getPoint();
            int dx = point2.x - point1.x;
            int dy = point2.y - point1.y;
            int x = getX();
            int y = getY();
            setLocation(x+dx,y+dy);
        }
    }
}

------解决方案--------------------
加这条语句  
System.exit(0);

------解决方案--------------------
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代码如下
Java code

public class Calc extends JFrame implements ActionListener,MouseListener,MouseMotionListener{

    JPanel jPanel;
    JTextField jTextField,JTFtitle;

        public Calc() {
      ……