java - JFrame 在调用 getContentPane().removeAll() 后卡住

Question

这个问题的标题不言自明。我正在使用 JFrame 制作扫雷的克隆，并且刚刚完成玩家选择游戏大小的起始屏幕。单击按钮时，框架应该会为游戏屏幕做好准备。当我单击一个按钮时，该按钮仍处于“按下”状态并且 JFrame 卡住并且我必须将其关闭。我做错了什么？

代码:

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


public class Minesweeper extends JFrame implements ActionListener{

    JLabel starttitle;
    ButtonObject[] gamefield;
    JFrame frame;
    JPanel startscreen;
    JPanel gamescreen;
    int gamesize;
    JButton ten;
    JButton tfive;
    JButton fifty;

    GridLayout layout; 



    public Minesweeper()
    {
        frame = new JFrame("Minesweeper");
        frame.setSize(500,500);
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setResizable(false);;
        startscreen = new JPanel();
        startScreen();
    }

    public void startScreen()
    {
        ten = new JButton("10 x 10");
        tfive = new JButton("25 x 25");
        fifty = new JButton("50 x 50");
        starttitle = new JLabel("Welcome to minesweeper. Click a game size to begin.");
        frame.add(startscreen);
        startscreen.add(starttitle);
        startscreen.add(ten);
        startscreen.add(tfive);
        startscreen.add(fifty);
        ten.addActionListener(this);
        tfive.addActionListener(this);
        fifty.addActionListener(this);
    }
    public void gameScreen()
    {
        frame.getContentPane().removeAll();//freezes JFrame
    }
    public void actionPerformed(ActionEvent e)
    {
        if(e.getSource()==ten)
        {
            gamesize = 10;

            gameScreen();
        }
        else if(e.getSource()==tfive)
        {
            gamesize = 25;

            gameScreen();
        }
        else if(e.getSource()==fifty)
        {
            gamesize = 50;

            gameScreen();
        }
        else
        {
            System.out.println("Fatal error");
        }

    }
    public static void main(String[] args)
    {
        new Minesweeper();
    }
}

Answer 1

它不会卡住，调用你的框架的repaint()方法，所有的组件都会被清除。

只需在 actionPerformed() 中添加下一行:

 frame.repaint();