java - Jpanel 内缺少 Jbutton 行

Question

谁能告诉我为什么 JFrame 缺少一行按钮？我正在尝试制作一个存储卡游戏，您单击按钮，它就会被图像替换，但有些按钮没有显示？我想这和我的布局有关。应该有一个 4x4 的可点击 jbutton。

package memoryCard;

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.net.URISyntaxException;

import javax.imageio.ImageIO;
import javax.swing.*;

public class gameBoard {

    public void newGame() throws IOException

    {
        //MAIN FRAMES
        JFrame mainFrame = new JFrame("Wagner's Memory");
        mainFrame.setSize (800, 650);
        mainFrame.setLocationRelativeTo(null);
        mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        mainFrame.setVisible(true);

        //Buttons
        JButton a1 = new JButton("");
        JButton a2 = new JButton("");
        JButton a3 = new JButton("");
        JButton a4 = new JButton("");
        JButton b1 = new JButton("");
        JButton b2 = new JButton("");
        JButton b3 = new JButton("");
        JButton b4 = new JButton("");
        JButton c1 = new JButton("");
        JButton c2 = new JButton("");
        JButton c3 = new JButton("");
        JButton c4 = new JButton("");
        JButton d1 = new JButton("");
        JButton d2 = new JButton("");
        JButton d3 = new JButton("");
        JButton d4 = new JButton("");

        //images

        //penguin.jpg (a1 & d3)



        //jax.jpg (a2 & c1)

        String pathJ = "jax.jpg";
        File fileJ = new File(pathJ);
        BufferedImage jax = ImageIO.read(fileJ);
        ImageIcon imgJ = new ImageIcon(jax);

        //blink.jpg(a3 & d4)
        String pathB = "blink.jpg";
        File fileB = new File(pathB);
        BufferedImage blink = ImageIO.read(fileB);
        ImageIcon imgB = new ImageIcon(blink);


        //mona.jpg(a4 & c4)
        String pathM = "mona.jpg";
        File fileM = new File(pathM);
        BufferedImage mona = ImageIO.read(fileM);
        ImageIcon imgM = new ImageIcon(mona);

        //beer.jpg(b1 & c2)
        String pathBeer = "beer.jpg";
        File fileBeer = new File(pathBeer);
        BufferedImage beer = ImageIO.read(fileBeer);
        ImageIcon imgBeer = new ImageIcon(beer);

        //jesus.jpg(b2 & c3)
        String pathJes = "jesus.jpg";
        File fileJes = new File(pathJes);
        BufferedImage jesus = ImageIO.read(fileJes);
        ImageIcon imgJes = new ImageIcon(jesus);


        //bball.png(b4 & d2)
        String pathBB = "bball.png";
        File fileBB = new File(pathBB);
        BufferedImage bball = ImageIO.read(fileBB);
        ImageIcon imgBB = new ImageIcon(bball);


        //cullen.jpg(b3 & d1)
        String pathC = "cullen.jpg";
        File fileC = new File(pathC);
        BufferedImage cullen = ImageIO.read(fileC);
        ImageIcon imgC = new ImageIcon(cullen);


        //jpanels

        JPanel panel1 = new JPanel(new BorderLayout());
        panel1.add(a1, BorderLayout.CENTER);
        JPanel panel2 = new JPanel(new BorderLayout());
        panel2.add(a2, BorderLayout.CENTER);
        JPanel panel3 = new JPanel(new BorderLayout());
        panel3.add(a3, BorderLayout.CENTER);
        JPanel panel4 = new JPanel(new BorderLayout());
        panel4.add(a4, BorderLayout.CENTER);
        JPanel panel5 = new JPanel(new BorderLayout());
        panel5.add(b1, BorderLayout.CENTER);
        JPanel panel6 = new JPanel(new BorderLayout());
        panel6.add(b2, BorderLayout.CENTER);
        JPanel panel7 = new JPanel(new BorderLayout());
        panel7.add(b3, BorderLayout.CENTER);
        JPanel panel8 = new JPanel(new BorderLayout());
        panel8.add(b4, BorderLayout.CENTER);
        JPanel panel9 = new JPanel(new BorderLayout());
        panel9.add(c1, BorderLayout.CENTER);
        JPanel panel10 = new JPanel(new BorderLayout());
        panel10.add(c2, BorderLayout.CENTER);
        JPanel panel11 = new JPanel(new BorderLayout());
        panel11.add(c3, BorderLayout.CENTER);
        JPanel panel12 = new JPanel(new BorderLayout());
        panel12.add(c4, BorderLayout.CENTER);
        JPanel panel13 = new JPanel(new BorderLayout());
        panel13.add(b1, BorderLayout.CENTER);
        JPanel panel14 = new JPanel(new BorderLayout());
        panel14.add(b2, BorderLayout.CENTER);
        JPanel panel15 = new JPanel(new BorderLayout());
        panel15.add(b3, BorderLayout.CENTER);
        JPanel panel16 = new JPanel(new BorderLayout());
        panel16.add(b4, BorderLayout.CENTER);

        //CONTAINER & ADDS
        Container content = mainFrame.getContentPane();
        content.setLayout(new GridLayout(4,4));
        content.add(panel1);
        content.add(panel2);
        content.add(panel3);
        content.add(panel4);
        content.add(panel5);
        content.add(panel6);
        content.add(panel7);
        content.add(panel8);
        content.add(panel9);
        content.add(panel10);
        content.add(panel11);
        content.add(panel12);
        content.add(panel13);
        content.add(panel14);
        content.add(panel15);
        content.add(panel16);

        content.setVisible(true);


        //ARRAY
        JButton buttonArray1 [] = {a1, a2, a3, a4,  b1, b2, b3, b4, c1, c2, c3, c4, d1, d2, d3, d4};


        for (int i = 0; i < buttonArray1.length; i++) {
              buttonArray1[i].addActionListener(new ActionListener() { //add an action listener to the current button
               @Override
               public void actionPerformed(ActionEvent e) 
               {
                   int d = 0;
                   d++;

                if (e.getSource() == a1) 
                    {

                        try {
                        String pathP = "penguin.jpg";
                        File fileP = new File(pathP);
                        BufferedImage peng;

                            peng = ImageIO.read(fileP);

                        ImageIcon imgP = new ImageIcon(peng);

                        JLabel imgLabel = new JLabel(imgP);
                        panel2.add(imgLabel);
                        content.add(panel1);
                        panel1.revalidate();
                        panel1.repaint();
                        } catch (IOException e1) {
                            // TODO Auto-generated catch block
                            e1.printStackTrace();
                        }

                    }

               }


              });
        }
    }
    public class wtf extends JPanel{
        @Override
       protected void paintComponent(Graphics g) {

          super.paintComponent(g);

       }
        }
}

Answer 1

一个组件只能有一个父组件。

您尝试将“b”按钮添加到两个不同的面板，因此这些按钮从第二个面板中删除。

最后一个面板应显示“d”按钮。

最好使用循环来创建和显示按钮。那么游戏可以是任意大小的网格。