如何使图标可见？

Question

我正在尝试制作一个记忆卡游戏，其中有2个玩家，轮流翻转2张卡。我编写了以下内容，并且代码有效，但是当我单击JButton时，它不显示图标。这是我写的。

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.ComponentOrientation;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Random;
import javax.swing.*;
import static javax.swing.JFrame.EXIT_ON_CLOSE;
import net.proteanit.sql.DbUtils;

public class doFirst extends JFrame{
    public doFirst(){
        p = new JPanel(new BorderLayout());

        iconarray[0] = new ImageIcon("1.png");
        iconarray[1] = new ImageIcon("2.png");
        iconarray[2] = new ImageIcon("3.png");
        iconarray[3] = new ImageIcon("4.png");
        iconarray[4] = new ImageIcon("5.png");
        iconarray[5] = new ImageIcon("6.png");
        iconarray[6] = new ImageIcon("1.png");
        iconarray[7] = new ImageIcon("2.png");
        iconarray[8] = new ImageIcon("3.png");
        iconarray[9] = new ImageIcon("4.png");
        iconarray[10] = new ImageIcon("5.png");
        iconarray[11] = new ImageIcon("6.png");
        iconarray[12] = new ImageIcon("flipped.png");


        p2 = new JPanel(new GridLayout(3,4));

        for (int i = 0; i <= 11; i++) {

            list1.add(0);
        }

        b = new JButton[12];
        for(int x =0; x<b.length; x++){
            b[x] = new JButton();
            b[x].setBackground(new Color(102, 0, 153));
            b[x].setIcon(new ImageIcon(getClass().getResource("flipped.png")));
            b[x].setPreferredSize(new Dimension(150, 150));
            list.add(b[x]);
            b[x].addActionListener(new ImageButtonListener());
        }

        Collections.shuffle(list);
        for(int x = 0; x < list.size(); x++)
        {
            p2.add((JButton)list.get(x));
        }

       int y = 0;
        while (y<12) { 
            int x = rand1.nextInt(6);
            list1.set(x, list1.get(x).intValue() + 1);
            if (list1.get(x) <= 2) {
                b[y].setName(Integer.toString(x));
                y++;
            }
        }

        timer1 = new Timer(1000, new TimerListener()); 


        p3 = new JPanel(new FlowLayout(FlowLayout.CENTER, 20, 5));
        player = new JLabel("Player");
        scor1 = new JLabel("0");
        computer = new JLabel("Computer");
        scor2 = new JLabel("0");
        p3.add(player);
        p3.add(scor1);
        p3.add(computer);
        p3.add(scor2);



        p.add(p2, BorderLayout.CENTER);
        p.add(p3, BorderLayout.SOUTH);
        add(p);
        setLocationRelativeTo(null);
        setVisible(true);
        pack();
        setDefaultCloseOperation(EXIT_ON_CLOSE);
    }


    class ImageButtonListener implements ActionListener {
        public void actionPerformed(ActionEvent e) {

            if (timer1.isRunning())
                return;

            for (int i = 0; i < 12; i++)
                if (e.getSource() == b[i]) {
                        int x = Integer.parseInt(b[i].getName());
                    b[i].setIcon(iconarray[x]);


                    if (counter == 1) {
                        button1 = b[i];
                        counter++;
                    }


                if (counter == 2 && b[i] != button1) {
                        button2 = b[i];
                        compareicons();
                    }
                }
        }


        private void compareicons() {
            if (button1.getIcon() == button2.getIcon()) {
                button1.setIcon(new ImageIcon(getClass().getResource("empty.png")));
                button2.setIcon(new ImageIcon(getClass().getResource("empty.png")));
                button1.setEnabled(false);
                button2.setEnabled(false);

                if (player1 == true) {
                    points1++;
                    scor1.setText(Integer.toString(points1));
                } else {
                    points2++;
                    scor2.setText(Integer.toString(points2));
                }
            }


            else {
                if (player1 == true) {
                    player1 = false;
                } else {
                    player1 = true;
                }
                timer1.start();
            }
            //reset counter
            counter = 1;
        }
    }



    public void shuffleButtons() {
        if (b != null) {
            Collections.shuffle(Arrays.asList(b));
            layoutButtons();
        }
    }

    public void layoutButtons() {
        p2.removeAll();
        for (JButton button : b) {
            p2.add(button);
        }
        p2.revalidate();
        p2.repaint();
    }



    private class TimerListener implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            button1.setIcon(new ImageIcon(getClass().getResource("flipped.png")));
            button2.setIcon(new ImageIcon(getClass().getResource("flipped.png")));
            timer1.stop();
            // active = true;
        }
    }



    }

public static void main(String[] args){
 new doFirst().setVisible(true);
}

    private JPanel p, p1, p2, p3, p4;
    private ArrayList list = new ArrayList();
    private JMenuBar mb;
    private final JButton[] b;
    private ImageIcon[] iconarray = new ImageIcon[13];
    private JMenu game, options, help;
    private JMenuItem newGame, restart, exit, showHistory, hideHistory, about;
    private JLabel player, computer, scor1, scor2, blank1, blank2;
    private int counter = 1;
    private Timer timer1;
    private boolean player1;
    private int points1 = 0;
    private int points2 = 0;
    private ArrayList<Integer> list1 = new ArrayList<Integer>();
    private Random rand1 = new Random();
    private JButton[] but = new JButton[2];
    private int[] x = new int[2];
    private JButton button1, button2;

}

下面应该使图标可见的行。

if (e.getSource() == b[i]) {
                        int x = Integer.parseInt(b[i].getName());
                    b[i].setIcon(iconarray[x]);

当我运行文件并单击2个JButton时，它显示jframe下面的图片。 我试过将b [i] .setIcon（iconarray [x]）替换为b [i] .setIcon（iconarray [i]），但没有成功。关于如何使其运作的任何想法？