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我正在嘗試製作一個小程序，它將在屏幕上的隨機位置顯示一個小方塊。然後，一旦我點擊廣場我想廣場消失，並在一小段隨機時間後，我想另一個廣場出現在屏幕上的另一個隨機地方。在線程休眠之前標籤位置的更改不會生效
這裏是我的代碼：
package mouse;
import org.apache.commons.io.FileUtils;
import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Random;
/**
* Created by owner on 07/11/2014.
*/
public class MouseTrainer extends JFrame implements MouseListener {
File record = new File("src\\main\\resources\\mouseRecord.txt");
Random rand = new Random();
JLabel lbl;
int x = 0;
int y = 0;
Thread recorder;
public MouseTrainer() throws IOException {
super("GFXAccelerator");
recorder = new Thread(new MouseRecorder(record));
BufferedImage img = ImageIO.read(new File("src\\main\\resources\\square.png"));
ImageIcon icon = new ImageIcon(img);
this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
JPanel contentPane = new JPanel();
contentPane.setOpaque(true);
contentPane.setBackground(Color.WHITE);
contentPane.setLayout(null);
lbl = new JLabel();
lbl.setSize(20, 20);
lbl.setIcon(icon);
lbl.setLocation(0, 0);
contentPane.addMouseListener(this);
contentPane.add(lbl);
this.setContentPane(contentPane);
this.setSize(2560, 1390);
this.setVisible(true);
}
public static void main(String[] args) throws InterruptedException, IOException {
MouseTrainer mr = new MouseTrainer();
}
public void randomPosition() throws IOException {
x = rand.nextInt(2540);
y = rand.nextInt(1350);
FileUtils.writeStringToFile(record, "NEW DESTINATION!\n", true);
lbl.setLocation(x, y);
}
private void hideSquare(){
lbl.setBounds(new Rectangle(new Point(3000, 3000), lbl.getPreferredSize()));
}
@Override
public void mouseClicked(MouseEvent e) {
if((e.getX() > x && e.getX() < x+20) && e.getY()>y && e.getY() <y+20){
System.out.println("hello");
hideSquare();
try {
FileUtils.writeStringToFile(record, "Destination clicked: x=" + x + "; y=" + y + "\n", true);
Thread.sleep(500 +rand.nextInt(5000));
randomPosition();
} catch (IOException e1) {
e1.printStackTrace();
} catch (InterruptedException e1) {
e1.printStackTrace();
}
}
}
@Override
public void mousePressed(MouseEvent e) {
}
@Override
public void mouseReleased(MouseEvent e) {
}
@Override
public void mouseEntered(MouseEvent e) {
}
@Override
public void mouseExited(MouseEvent e) {
}
}
我聽的鼠標點擊，並點擊鼠標我改變廣場的位置屏幕的面積，並做了Thread.sleep（）方法來等待和畫下一個廣場。不幸的是，該位置不會改變到屏幕外的位置，並且廣場停留在同一個地方。
有人可以解釋爲什麼會發生這種情況，也許我可以在用戶點擊它之後，在下一個方塊出現之前讓方塊消失。