Question

我正在创建一个二十一点游戏，每次用户点击一个按钮时都需要刷新JFrame。但是，框架没有更新！我已经试了好几个小时试图解决这个问题。

如何根据我用来加载图像的ImageIcon对象堆栈正确重新加载框架中的所有元素？

这是我的代码：

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Stack;

public class Blackjack extends JFrame implements ActionListener {
    public void drawGUI(boolean firstTime) {
        getContentPane().removeAll();

        setLayout(new GridLayout(3, 9, 1, 1));
        updateValues();

        add(new JLabel(DEALER_TEXT, SwingConstants.CENTER));
        add(new JLabel("Value: " + computerValue, SwingConstants.CENTER));
        for(int i = 0; i < computerCards.size(); i++)
            add(new JLabel(computerCards.get(i).getImagePath()));

        leaveSpacing(false);

        add(new JLabel(USER_TEXT, SwingConstants.CENTER));
        add(new JLabel("Value: " + userValue, SwingConstants.CENTER));
        for(int i = 0; i < userCards.size(); i++)
            add(new JLabel(userCards.get(i).getImagePath()));

        leaveSpacing(true);

        if(firstTime) {
            hitButton.addActionListener(this);
            standButton.addActionListener(this);
        }

        leaveSpacing(3);
        add(hitButton);
        add(standButton);
        leaveSpacing(1);
    }
}

Answer 1

您需要在revalidate();方法结束时致电repaint();和drawGUI();。这应该可以解决问题。

之前在SO上已经回答了这个问题，请参阅：Java Swing revalidate and repaint

Answer 2

这个（工作）mcve：

怎么样？

import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingConstants;

public class BalckJack extends JFrame implements ActionListener {

    private JButton hitButton = new JButton("Hit");
    private int computerValue;

    public static void main(String[] args) {

        BalckJack frame = new BalckJack();
        frame.setTitle("Cards");
        frame.setSize(800, 320);
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }

    public BalckJack() {

        computerValue = 0;

        for(int i = 0; i < 27; i++) {
            add(new JLabel(new ImageIcon("")));
        }

        drawGUI(true);
    }

    public void drawGUI(boolean firstTime) {

        getContentPane().removeAll();

        setLayout(new GridLayout(1, 2, 1, 1));

        add(new JLabel("Value: " + computerValue++, SwingConstants.CENTER));

        if(firstTime) {
            hitButton.addActionListener(this);
        }

        add(hitButton);
        revalidate();  //(!!!!)
    }

    @Override
    public void actionPerformed(ActionEvent evt) {

        drawGUI(false);
    }
}

在JFrame故障中重新加载GUI

2 个答案: