从jframe外部更改和更新jpanel组件不工作,swing

我正在使用jpanel(更改其组件),但我想从外部jframe更改它。

抱歉,我用netbeans编写了这段代码(我知道它放了一些问题不需要的东西),并尝试对其进行干净的编辑,因为真正的代码更大

这里是jpanel的代码,名为“mypanel”。

    public class MyPanel extends javax.swing.JPanel {

      private javax.swing.JButton filling = new javax.swing.JButton();
      private javax.swing.JScrollPane jScrollPane1 = new javax.swing.JScrollPane();
      private javax.swing.JTable myTable = new javax.swing.JTable();

      private final javax.swing.table.DefaultTableModel INITIAL_TABLE_MODEL = new javax.swing.table.DefaultTableModel(
          new Object[][]{},
          new String[]{"Text", "Integer"}
      );

      public MyPanel() {
        initComponents();
        //callFilling(); // INNER CALL!
      }

      private void initComponents() {
        filling.setText("filling");
        filling.addActionListener(new java.awt.event.ActionListener() {
          public void actionPerformed(java.awt.event.ActionEvent evt) {
            fillingActionPerformed(evt);
          }
        });

        myTable.setModel(new javax.swing.table.DefaultTableModel(
          new Object [][] { },
          new String [] { "Text", "Integer" }
       ) {
          Class[] types = new Class [] {
            java.lang.String.class, java.lang.Integer.class
          };

          public Class getColumnClass(int columnIndex) {
            return types [columnIndex];
          }
        });
        jScrollPane1.setViewportView(myTable);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
        this.setLayout(layout);
        layout.setHorizontalGroup(
          layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
          .addGroup(layout.createSequentialGroup()
            .addContainerGap()
            .addComponent(filling)
            .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
          .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 400, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
          layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
          .addGroup(layout.createSequentialGroup()
            .addContainerGap()
            .addComponent(filling)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
            .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 275, javax.swing.GroupLayout.PREFERRED_SIZE))
        );
      }                   

      public void callFilling() {
        myTable.setModel(INITIAL_TABLE_MODEL);
        INITIAL_TABLE_MODEL.setRowCount(0);
        ((javax.swing.table.DefaultTableModel) myTable.getModel()).setRowCount(0);
        Integer numberRows = new java.util.Random().nextInt((10 - 2) + 1) + 2;
        for (int i = 0; i < numberRows; i++) {
          Integer number = new java.util.Random().nextInt();
          ((javax.swing.table.DefaultTableModel) myTable.getModel()).addRow(
              new Object[]{
                number.toString(), number
              });
        }
        this.revalidate();
        this.repaint();
      }

      private void fillingActionPerformed(java.awt.event.ActionEvent evt) {                                        
        callFilling();
      }
    }

框架!!!!

public class MainFrame extends javax.swing.JFrame {

  private javax.swing.JTabbedPane myTabbed = new javax.swing.JTabbedPane();

  public MainFrame() {
    initComponents();
    MyPanel myPanel = addNewTab();
    myPanel.callFilling(); //OUTER CALL!
    myPanel.revalidate();
    myPanel.repaint();
    addNewTab();
  }

  private MyPanel addNewTab() {
    int idx = myTabbed.getTabCount();
    String title = "myTabbed: " + idx + " ";
    MyPanel myPanel = new MyPanel();
    myTabbed.insertTab(title, null, new MyPanel(), null, idx);
    return myPanel;
  }

  private void initComponents() {
    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

    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(myTabbed, javax.swing.GroupLayout.DEFAULT_SIZE, 394, Short.MAX_VALUE)
        .addContainerGap())
    );
    layout.setVerticalGroup(
      layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
      .addGroup(layout.createSequentialGroup()
        .addContainerGap()
        .addComponent(myTabbed, javax.swing.GroupLayout.DEFAULT_SIZE, 288, Short.MAX_VALUE)
        .addContainerGap())
    );

    pack();
  }

  public static void main(String args[]) {
    java.awt.EventQueue.invokeLater(() -> {
      new MainFrame().setVisible(true);
    });
  }
}

当 callFilling(); 是JPanel发的吗( 查看内部呼叫 工作!,但来自JFrame( 查看//外部呼叫 不管用!

回顾这个问题 Update content of JPanel on a frame on button click in another frame 提出的 revalidate(); repaint(); 我使用的代码,但不起作用。

如何解决这个问题?