java - 如何禁用 JPanel 的自动调整大小？

Question

Hye 我正在开发一个 Java J2SE(测试，只是为了知识)应用程序。这里我正在做的是我想将 5 个子面板添加到主面板。然后为它们分配不同的颜色，之后我必须为 JLabel 分配彩色框的图像。只需使用 Random 类，我就必须在子面板中随机设置可见的带有图像的 JLabel。

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问题!问题是每当我添加一个带有图像的 JLabel 时，子面板将自动调整大小。我怎样才能克服这个？我已经搜索了很多，但未能了解如何解决这个问题!

我一直在尝试什么!我使用了不同的布局管理器但没有成功!

我的代码

      import java.util.Random;
      import java.util.logging.Level;
      import java.util.logging.Logger;
      import javax.swing.JLabel;



     public class PanelMovement extends javax.swing.JFrame {


    public PanelMovement() {
        initComponents();
        Thread t=new Thread(new RunThread());
        t.start();
        a.setVisible(false);
        b.setVisible(false);
        c.setVisible(false);
        d.setVisible(false);
        e.setVisible(false);
    }


    private void initComponents() {

        mainpanel = new javax.swing.JPanel();
        green = new javax.swing.JPanel();
        a = new javax.swing.JLabel();
        blue = new javax.swing.JPanel();
        b = new javax.swing.JLabel();
        black = new javax.swing.JPanel();
        c = new javax.swing.JLabel();
        white = new javax.swing.JPanel();
        d = new javax.swing.JLabel();
        yellow = new javax.swing.JPanel();
        e = new javax.swing.JLabel();
        tt = new javax.swing.JTextField();
        jLabel1 = new javax.swing.JLabel();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setResizable(false);

        mainpanel.setBackground(new java.awt.Color(255, 255, 255));

        green.setBackground(new java.awt.Color(51, 255, 0));
        green.setMinimumSize(new java.awt.Dimension(97, 122));

        a.setIcon(new javax.swing.ImageIcon(getClass().getResource("/2.png"))); // NOI18N
        a.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                aMouseClicked(evt);
            }
        });

        javax.swing.GroupLayout greenLayout = new javax.swing.GroupLayout(green);
        green.setLayout(greenLayout);
        greenLayout.setHorizontalGroup(
            greenLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(greenLayout.createSequentialGroup()
                .addContainerGap()
                .addComponent(a)
                .addContainerGap(31, Short.MAX_VALUE))
        );
        greenLayout.setVerticalGroup(
            greenLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(greenLayout.createSequentialGroup()
                .addGap(25, 25, 25)
                .addComponent(a)
                .addContainerGap(61, Short.MAX_VALUE))
        );

        blue.setBackground(new java.awt.Color(0, 0, 204));

        b.setIcon(new javax.swing.ImageIcon(getClass().getResource("/5.jpg"))); // NOI18N
        b.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                bMouseClicked(evt);
            }
        });

        javax.swing.GroupLayout blueLayout = new javax.swing.GroupLayout(blue);
        blue.setLayout(blueLayout);
        blueLayout.setHorizontalGroup(
            blueLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(blueLayout.createSequentialGroup()
                .addContainerGap()
                .addComponent(b)
                .addContainerGap(31, Short.MAX_VALUE))
        );
        blueLayout.setVerticalGroup(
            blueLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(blueLayout.createSequentialGroup()
                .addGap(25, 25, 25)
                .addComponent(b)
                .addContainerGap(61, Short.MAX_VALUE))
        );

        black.setBackground(new java.awt.Color(0, 0, 0));

        c.setForeground(new java.awt.Color(255, 255, 255));
        c.setIcon(new javax.swing.ImageIcon(getClass().getResource("/3.jpg"))); // NOI18N
        c.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                cMouseClicked(evt);
            }
        });

        javax.swing.GroupLayout blackLayout = new javax.swing.GroupLayout(black);
        black.setLayout(blackLayout);
        blackLayout.setHorizontalGroup(
            blackLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(blackLayout.createSequentialGroup()
                .addGap(30, 30, 30)
                .addComponent(c)
                .addContainerGap(11, Short.MAX_VALUE))
        );
        blackLayout.setVerticalGroup(
            blackLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, blackLayout.createSequentialGroup()
                .addContainerGap(46, Short.MAX_VALUE)
                .addComponent(c)
                .addGap(40, 40, 40))
        );

        white.setBackground(new java.awt.Color(0, 255, 255));

        d.setIcon(new javax.swing.ImageIcon(getClass().getResource("/1.png"))); // NOI18N
        d.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                dMouseClicked(evt);
            }
        });

        javax.swing.GroupLayout whiteLayout = new javax.swing.GroupLayout(white);
        white.setLayout(whiteLayout);
        whiteLayout.setHorizontalGroup(
            whiteLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(whiteLayout.createSequentialGroup()
                .addContainerGap()
                .addComponent(d)
                .addContainerGap(31, Short.MAX_VALUE))
        );
        whiteLayout.setVerticalGroup(
            whiteLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, whiteLayout.createSequentialGroup()
                .addContainerGap(61, Short.MAX_VALUE)
                .addComponent(d)
                .addGap(25, 25, 25))
        );

        yellow.setBackground(new java.awt.Color(255, 255, 0));

        e.setIcon(new javax.swing.ImageIcon(getClass().getResource("/4.jpg"))); // NOI18N
        e.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                eMouseClicked(evt);
            }
        });

        javax.swing.GroupLayout yellowLayout = new javax.swing.GroupLayout(yellow);
        yellow.setLayout(yellowLayout);
        yellowLayout.setHorizontalGroup(
            yellowLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, yellowLayout.createSequentialGroup()
                .addContainerGap(22, Short.MAX_VALUE)
                .addComponent(e)
                .addGap(19, 19, 19))
        );
        yellowLayout.setVerticalGroup(
            yellowLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, yellowLayout.createSequentialGroup()
                .addContainerGap(46, Short.MAX_VALUE)
                .addComponent(e)
                .addGap(40, 40, 40))
        );

        jLabel1.setText("Score=");

        javax.swing.GroupLayout mainpanelLayout = new javax.swing.GroupLayout(mainpanel);
        mainpanel.setLayout(mainpanelLayout);
        mainpanelLayout.setHorizontalGroup(
            mainpanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(mainpanelLayout.createSequentialGroup()
                .addGap(199, 199, 199)
                .addComponent(jLabel1)
                .addGap(18, 18, 18)
                .addComponent(tt, javax.swing.GroupLayout.PREFERRED_SIZE, 39, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, mainpanelLayout.createSequentialGroup()
                .addGap(78, 78, 78)
                .addComponent(green, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(67, 67, 67)
                .addComponent(blue, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(50, 50, 50)
                .addComponent(black, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 70, Short.MAX_VALUE)
                .addComponent(white, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(43, 43, 43)
                .addComponent(yellow, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap())
        );
        mainpanelLayout.setVerticalGroup(
            mainpanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(mainpanelLayout.createSequentialGroup()
                .addGap(131, 131, 131)
                .addGroup(mainpanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                    .addComponent(yellow, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(black, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(blue, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(green, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(white, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 115, Short.MAX_VALUE)
                .addGroup(mainpanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(tt, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel1))
                .addGap(44, 44, 44))
        );

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addComponent(mainpanel, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addComponent(mainpanel, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(0, 0, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>                        
     int count=0;
    private void aMouseClicked(java.awt.event.MouseEvent evt) {                               
        count+=1;
        tt.setText(Integer.toString(count));
    }                              

    private void bMouseClicked(java.awt.event.MouseEvent evt) {                               
        count+=1;
        tt.setText(Integer.toString(count));
    }                              

    private void cMouseClicked(java.awt.event.MouseEvent evt) {                               
      count+=1;
        tt.setText(Integer.toString(count));
    }                              

    private void dMouseClicked(java.awt.event.MouseEvent evt) {                               
     count+=1;
        tt.setText(Integer.toString(count));
    }                              

    private void eMouseClicked(java.awt.event.MouseEvent evt) {                               
        count+=1;
        tt.setText(Integer.toString(count));
    }                              
    private class RunThread implements Runnable{
    Random randomGenerator = new Random();



    public void run(){
        boolean flag=true;
            while(flag){
                int  RandomBox = randomGenerator.nextInt(5)+1;

                try{
                    Thread.currentThread().sleep(1000);
                }catch(Exception e){

                }
      if(RandomBox==1){
         a.setVisible(true);
                    try {
                        Thread.currentThread().sleep(300);
                          a.setVisible(false);
                    } catch (InterruptedException ex) {
                        Logger.getLogger(PanelMovement.class.getName()).log(Level.SEVERE, null, ex);
                    }


      }
      else if(RandomBox==2){
          b.setVisible(true);
          try {
                        Thread.currentThread().sleep(300);
                          b.setVisible(false);
                    } catch (InterruptedException ex) {
                        Logger.getLogger(PanelMovement.class.getName()).log(Level.SEVERE, null, ex);
                    }
      }
      else if(RandomBox==3){
          c.setVisible(true);
          try {
                        Thread.currentThread().sleep(300);
                          c.setVisible(false);
                    } catch (InterruptedException ex) {
                        Logger.getLogger(PanelMovement.class.getName()).log(Level.SEVERE, null, ex);
                    }
      }
      else if(RandomBox==4){
          d.setVisible(true);
          try {
                        Thread.currentThread().sleep(300);
                          d.setVisible(false);
                    } catch (InterruptedException ex) {
                        Logger.getLogger(PanelMovement.class.getName()).log(Level.SEVERE, null, ex);
                    }
      }
      else if(RandomBox==5){
        e.setVisible(true);
        try {
                        Thread.currentThread().sleep(300);
                          e.setVisible(false);
                    } catch (InterruptedException ex) {
                        Logger.getLogger(PanelMovement.class.getName()).log(Level.SEVERE, null, ex);
                    }
    }

    }
            }


}
    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(PanelMovement.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(PanelMovement.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(PanelMovement.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(PanelMovement.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new PanelMovement().setVisible(true);
                new PanelMovement().pack();
            }
        });
    }
    // Variables declaration - do not modify                     
    private javax.swing.JLabel a;
    private javax.swing.JLabel b;
    private javax.swing.JPanel black;
    private javax.swing.JPanel blue;
    private javax.swing.JLabel c;
    private javax.swing.JLabel d;
    private javax.swing.JLabel e;
    private javax.swing.JPanel green;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JPanel mainpanel;
    private javax.swing.JTextField tt;
    private javax.swing.JPanel white;
    private javax.swing.JPanel yellow;
    // End of variables declaration                   
}

屏幕截图

在添加 JLabel 之前 添加jlabel后(真正的问题)

Answer 1

.setResizable(false) 这样的东西行得通吗？还是我误解了问题？