如何通過循環動態添加JPanel？

Question

請我想通過循環動態添加JPanel 。 我試過像這樣調用函數：

public void Repeat() {
   for(int i = 0; i < 10; i++) {
       jPanel3.add(jPanel9);
   }
}

這是面板的源代碼

javax.swing.GroupLayout jPanel12Layout = new javax.swing.GroupLayout(jPanel12);
    jPanel12.setLayout(jPanel12Layout);
    jPanel12Layout.setHorizontalGroup(
        jPanel12Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel12Layout.createSequentialGroup()
            .addGroup(jPanel12Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                .addGroup(jPanel12Layout.createSequentialGroup()
                    .addGap(14, 14, 14)
                    .addGroup(jPanel12Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                        .addGroup(javax.swing.GroupLayout.Alignment.LEADING, jPanel12Layout.createSequentialGroup()
                            .addComponent(jLabel22)
                            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 84, Short.MAX_VALUE)
                            .addComponent(jLabel23))
                        .addGroup(jPanel12Layout.createSequentialGroup()
                            .addComponent(jLabel24)
                            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                            .addComponent(jLabel25)
                            .addGap(33, 33, 33)
                            .addComponent(jLabel26)
                            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                            .addComponent(jLabel27))
                        .addComponent(jSeparator3)))
                .addGroup(jPanel12Layout.createSequentialGroup()
                    .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(jLabel7)
                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                    .addComponent(jLabel8)))
            .addGap(14, 14, 14))
    );
    jPanel12Layout.setVerticalGroup(
        jPanel12Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(jPanel12Layout.createSequentialGroup()
            .addContainerGap()
            .addGroup(jPanel12Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addComponent(jLabel22)
                .addComponent(jLabel23))
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
            .addComponent(jSeparator3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
            .addGroup(jPanel12Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel12Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                    .addComponent(jLabel24, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addGroup(jPanel12Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                        .addComponent(jLabel25)
                        .addComponent(jLabel26)))
                .addComponent(jLabel27, javax.swing.GroupLayout.Alignment.TRAILING))
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
            .addGroup(jPanel12Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addComponent(jLabel8)
                .addComponent(jLabel7, javax.swing.GroupLayout.PREFERRED_SIZE, 16, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addGap(12, 12, 12))
    );

    jPanel9.add(jPanel12, new org.netbeans.lib.awtextra.AbsoluteConstraints(6, 119, 346, 100));

我已經復制並粘貼了代碼，但是無法正常工作。 這是面板問題，還是動態添加JPanel是否存在其他邏輯

Answer 1

您確定要在面板中添加10個相同的組件嗎？ 確保檢查有關正確使用面板的文檔，並在其中添加某些組件。 https://docs.oracle.com/javase/tutorial/uiswing/components/panel.html

Answer 2

無需特殊邏輯。 只需保留一個面板作為父面板，然后在其上添加所有動態面板即可。

    JPanel mainPanel = new JPanel();

    for (int i = 0; i < 10; i++ ){
       JPanel childPanel = new JPanel();
       /**
         * This below line is not needed. Added here 
         * just to show different number to identify each panel.
         */
       childPanel.add(new JLabel("Number : " + i));

       mainPanel.add(childPanel);
    }

   // Add the main Panel in your frame.
    add(mainPanel);