java jwindow 键盘_各位老哥求救，JWINDOW无法接收到键盘监听

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下面po代码啊。这是我的类。

class DragWindow extends JWindow{

int positionX;

int positionY;

public DragWindow() {

try {

jbInit();

}

catch(Exception e) {

e.printStackTrace();

}

}

private void jbInit() throws Exception {

this.addMouseListener(new java.awt.event.MouseAdapter() {

public void mousePressed(MouseEvent e) {

this_mousePressed(e);

}

});

this.addMouseMotionListener(new java.awt.event.MouseMotionAdapter() {

public void mouseDragged(MouseEvent e) {

this_mouseDragged(e);

}

});

this.addKeyListener(new java.awt.event.KeyAdapter() {

publicvoid keypressed(KeyEvent e){

this_KeyPress(e);

}

});

}

void this_mouseDragged(MouseEvent e) {

Point point = this.getLocation();

this.setLocation(point.x + e.getX() - positionX,point.y + e.getY() - positionY);

}

void this_mousePressed(MouseEvent e) {

positionX = e.getX();

positionY = e.getY();

}

voidthis_KeyPress(KeyEvent e) {

Point point = this.getLocation();

if(e.getKeyCode()==KeyEvent.VK_LEFT)

this.setLocation(point.x - 2,point.y);

if(e.getKeyCode()==KeyEvent.VK_RIGHT)

this.setLocation(point.x + 2,point.y);

if(e.getKeyCode()==KeyEvent.VK_UP)

this.setLocation(point.x,point.y - 2);

if(e.getKeyCode()==KeyEvent.VK_DOWN)

this.setLocation(point.x,point.y + 2);

}

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