DukeIMPopupWindow.java模仿好友上線提示窗口

import java.awt.*;
import javax.swing.*;


public class DukeIMPopupWindow extends Thread{
    public static final int moveStep = 3;
    
    JFrame popupFrame;
    Container contentPane;
    Dimension screenSize;
    int topPosition;
    int basePosition;
    int leftPosition;
    
    
    public DukeIMPopupWindow() {
        popupFrame = new JFrame("好友上線");
        contentPane = popupFrame.getContentPane();
        screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        //上邊界
        topPosition = screenSize.height - 185;
        //下邊界
        basePosition = screenSize.height;
        //左邊界
        leftPosition = screenSize.width - 250;

        JLabel messageLabel = new JLabel("好友上線囉!",JLabel.CENTER);
        contentPane.add(messageLabel);

        popupFrame.setLocation(leftPosition , basePosition);
        popupFrame.setSize(250,150);
        popupFrame.setResizable(false);
        popupFrame.setVisible(true);
    }
    public void closeWindow() {
        if(popupFrame != null) {
            popupFrame.dispose();
            System.exit(0);
        }
    }
    public void run() {
        while(true) {
            try {
                Thread.sleep(10);
                if(basePosition - moveStep > topPosition) {
                    popupFrame.setLocation(leftPosition, basePosition);
                    basePosition  -= moveStep;
                } else {
                    Thread.sleep(1500);
                    closeWindow();
                }
                
            }catch(InterruptedException inE) {
                inE.printStackTrace();
            }
        }
    }
    public static void main( String args[] ) {
        DukeIMPopupWindow popupWindow = new DukeIMPopupWindow();
        popupWindow.start();
    }
    
}