1 去掉标题栏：JFrame frame=new JFrame(); frame.setUndecorated(true); 2  3 实现拖动：定义全局变量: int first_x; int first_y; 4  5 添加MouseListener, 重写mousePressed方法 6  7 public void mousePressed(MouseEvent e){ 8  9 first_x=e.getX();10 11 first_y=e.getY(); //记录下位移的初点12 13 }14 15 添加MouseMotionListener，重写mouseDragged方法16 17 public void mouseDragged(MouseEvent e){18 19 int x=e.getX()-first_x;20 21 int y=e.getY()-first_y;  //取得位移(x,y)22 23 frame.setBounds(frame.getX()+x, frame.getY()+y, frame.getWidth(), frame.getHeight());24 25 }