Jpanel内缺少Jbutton行

Question

谁能告诉我为什么JFrame缺少一排按钮？我试图制作一个存储卡游戏，点击按钮后，它被图像取代，但一些按钮没有显示出来？我认为这与我的布局有关。应该有一个4x4的可点击jbuttons。

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。

您尝试将“b”按钮添加到两个不同的面板，以便从第二个面板中删除这些按钮。

最后一个面板应显示“d”按钮。

更好的是使用循环来创建和显示按钮。然后游戏可以是任何大小的网格。