import java.awt.Point;  import java.awt.Rectangle;  import java.awt.event.ActionEvent;  import java.awt.event.ActionListener;  import java.awt.event.MouseAdapter;  import java.awt.event.MouseEvent;  import java.awt.event.MouseMotionAdapter;    import javax.swing.JFrame;  import javax.swing.Timer;    public class HideFrame extends JFrame implements ActionListener{   private Rectangle rect;   private int frameLeft;// 窗体离屏幕左边的距离   private int frameRight;// 窗体离屏幕右边的距离；   private int frameTop;// 窗体离屏幕顶部的距离   private int frameWidth; // 窗体的宽   private int frameHeight; // 窗体的高      private int screenXX;// 屏幕的宽度；   private Point point; // 鼠标在窗体的位置     private Timer timer = new Timer(10, this);   private int xx, yy;   private boolean isDraging = false;      public HideFrame(){    timer.start();    setTitle("窗体在屏幕边缘隐藏演示");    setSize(400, 300);    setUndecorated(true);    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);    setAlwaysOnTop(true);    addMouseListener(new MouseAdapter() {     public void mousePressed(MouseEvent e) {      isDraging = true;      xx = e.getX();      yy = e.getY();     }       public void mouseReleased(MouseEvent e) {      isDraging = false;     }    });    addMouseMotionListener(new MouseMotionAdapter() {     public void mouseDragged(MouseEvent e) {      if (isDraging) {       int left = getLocation().x;       int top = getLocation().y;       setLocation(left + e.getX() - xx, top + e.getY() - yy);       repaint();      }     }    });    setVisible(true);   }   @Override   public void actionPerformed(ActionEvent arg0) {    frameLeft = getLocationOnScreen().x;    frameTop = getLocationOnScreen().y;    frameWidth = getWidth();    frameHeight = getHeight();    screenXX = java.awt.Toolkit.getDefaultToolkit().getScreenSize().width;    frameRight =screenXX- frameLeft - frameWidth;      // 获取窗体的轮廓    rect = new Rectangle(0, 0, frameWidth, frameHeight);    // 获取鼠标在窗体的位置    point =getMousePosition();      if (frameLeft < 0 && isPtInRect(rect, point)) {     setLocation(0, frameTop); // 隐藏在左边，鼠标指到后显示窗体；    } else if (frameLeft > -5 && frameLeft < 5 && !(isPtInRect(rect, point))) {     setLocation(frameLeft - frameWidth + 1, frameTop); // 窗体移到左边边缘隐藏到左边；    } else if ((frameTop < 0 && frameLeft < 0) && isPtInRect(rect, point)) {// 窗体在左上角；     setLocation(0, 0);// 窗口隐藏了，鼠标指到他，就显示出来；    } else if ((frameTop > -5 && frameTop < 5) && (frameLeft > -5 && frameLeft < 5) && !(isPtInRect(rect, point))) {     // 当窗体的上边框与屏幕的顶端的距离小于5时 ，     // 并且鼠标不再窗体上将窗体隐藏到屏幕的顶端     setLocation(frameLeft - frameWidth + 1, 1);    } else if ((frameTop < 0) && isPtInRect(rect, point)) {     setLocation(frameLeft, 0);// 窗口隐藏了，鼠标指到他，就显示出来；    } else if (frameTop > -5 && frameTop < 5 && !(isPtInRect(rect, point))) {     // 当窗体的上边框与屏幕的顶端的距离小于5时 ，     // 并且鼠标不再窗体上将窗体隐藏到屏幕的顶端     setLocation(frameLeft, 1 - frameHeight);    } else if (frameRight < 0 && isPtInRect(rect, point)) {     setLocation(screenXX - frameWidth + 1, frameTop);// 隐藏在右边，鼠标指到后显示；    } else if (frameRight > -5 && frameRight < 5 && !(isPtInRect(rect, point))) {     setLocation(screenXX - 1, frameTop); // 窗体移到屏幕右边边缘隐藏到右边；    } else if (frameRight < 0 && frameTop < 0 && isPtInRect(rect, point)) {// 窗体在右上角；     setLocation(screenXX - frameWidth + 1, 0);// 隐藏在右边，鼠标指到后显示；    } else if ((frameRight > -5 && frameRight < 5) && (frameTop > -5 && frameTop < 5) && !(isPtInRect(rect, point))) {     setLocation(screenXX - 1, 1); // 窗体移到屏幕右边边缘隐藏到右边；    }   }      /**    * 检测是否在矩形框内    * @param rect    * @param point    * @return    */   public boolean isPtInRect(Rectangle rect, Point point) {    if (rect != null && point != null) {     int x0 = rect.x;     int y0 = rect.y;     int x1 = rect.width;     int y1 = rect.height;     int x = point.x;     int y = point.y;       return x >= x0 && x < x1 && y >= y0 && y < y1;    }    return false;   }   public static void main(String[] args){    HideFrame frame = new HideFrame();   }  }