运行 JSwing 后组件不可见（已解决）

Question

在我从下面运行代码后，除了 titleBar 之外没有显示任何组件 我需要按下 graphButton，然后再次按下要显示的面板和按钮的 calcButton。 我正在尝试调用 calcButton 的所有功能，因此它是用户运行程序时的默认界面

import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.Color;
import java.awt.Point;
import javax.swing.BorderFactory;
import javax.swing.JPanel;
public class Main {
  public static Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
  public static void main(String[] args) {
    JFrame f=new JFrame();
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.setUndecorated(true);
    f.setVisible(true);
    JButton[][] Buttons = new JButton[6][4];
    JPanel titleBar = new JPanel();
    titleBar.setPreferredSize(new Dimension(f.getWidth(), 32));
    titleBar.setBackground(Color.darkGray);
    JButton exitButton = new JButton("x");
    exitButton.setFocusable(false);
    exitButton.setForeground(Color.white);
    exitButton.setBorderPainted(false);
    exitButton.addActionListener(e -> System.exit(0));
    exitButton.setBackground(new Color(50,50,50));
    JButton minimizeButton = new JButton("-");
    minimizeButton.addActionListener(e -> f.setState(Frame.ICONIFIED));
    minimizeButton.setFocusable(false);
    minimizeButton.setForeground(Color.white);
    minimizeButton.setBorderPainted(false);
    minimizeButton.setBackground(new Color(50,50,50));
    JButton calcButton=new JButton("calcbutton");
    calcButton.setSize(16,16);
    calcButton.setBackground(titleBar.getBackground());
    calcButton.setFocusable(false);
    calcButton.setForeground(Color.white);
    calcButton.setBorderPainted(false);
    JButton graphButton=new JButton("graphbutton");
    graphButton.setSize(16,16);
    graphButton.setBackground(titleBar.getBackground());
    graphButton.setFocusable(false);
    graphButton.setForeground(Color.white);
    graphButton.setBorderPainted(false);
    titleBar.setLayout(new FlowLayout(FlowLayout.LEFT));
    titleBar.add(calcButton);
    titleBar.add(graphButton);
    titleBar.setLayout(new FlowLayout(FlowLayout.RIGHT));
    titleBar.add(minimizeButton);
    titleBar.add(exitButton);
    f.setJMenuBar(new JMenuBar() {
      { add(titleBar); }
    });
    for (int i = 0; i < 6; i++)
      for (int j = 0; j < 4; j++) {
        Buttons[i][j] = new JButton();
        Buttons[i][j].setPreferredSize(new Dimension(60, 60));
        Buttons[i][j].setFocusable(false);
        Buttons[i][j].setBackground(new Color(20,20,20));
        Buttons[i][j].setForeground(Color.white);
        Buttons[i][j].setRolloverEnabled(false);
      }
    JPanel ButtonPanel = new JPanel();
    JPanel PrintPanel = new JPanel();
    JPanel PrintPanel2 = new JPanel();
    JLabel PrintLabel = new JLabel();
    PrintLabel.setPreferredSize(new Dimension(240, 30));
    PrintLabel.setHorizontalAlignment(SwingConstants.RIGHT);
    PrintPanel.setBackground(Color.darkGray);
    PrintLabel.setForeground(Color.white);
    PrintPanel.setPreferredSize(new Dimension(240, 30));
    PrintPanel.add(PrintLabel);
    JLabel PrintLabel2 = new JLabel("");
    PrintPanel2.setBackground(Color.darkGray);
    PrintLabel2.setForeground(Color.lightGray);
    PrintLabel2.setPreferredSize(new Dimension(240, 30));
    PrintLabel2.setHorizontalAlignment(SwingConstants.RIGHT);
    PrintPanel2.add(PrintLabel2);
    PrintPanel2.setPreferredSize(new Dimension(240, 30));
    ButtonPanel.setLayout(new GridLayout(6, 4));
    for (int i = 0; i < 6; i++)
      for (int j = 0; j < 4; j++)
        ButtonPanel.add(Buttons[i][j]);
    Graph panel=new Graph();
    GridBagLayout gridBagLayout = new GridBagLayout();
    f.setSize(screenSize.width/7, screenSize.height/2);
    f.setLocation(screenSize.width/2-f.getWidth()/2,screenSize.height/2-f.getHeight()/2);
    f.setLayout(gridBagLayout);
    GridBagConstraints constraints = new GridBagConstraints();
    constraints.gridx = 0;
    constraints.gridy = 0;
    constraints.weightx = 1.0;
    constraints.weighty = 0.0;
    constraints.fill = GridBagConstraints.HORIZONTAL;
    PrintPanel2.setVisible(true);
    f.add(PrintPanel2, constraints);
    constraints.gridx = 0;
    constraints.gridy = 1;
    constraints.weightx = 1.0;
    constraints.weighty = 0.0;
    constraints.fill = GridBagConstraints.HORIZONTAL;
    PrintPanel.setVisible(true);
    f.add(PrintPanel, constraints);
    constraints.gridx = 0;
    constraints.gridy = 2;
    constraints.weightx = 1.0;
    constraints.weighty = 1.0;
    constraints.fill = GridBagConstraints.BOTH;
    ButtonPanel.setVisible(true);
    f.add(ButtonPanel, constraints);

    f.revalidate();
    calcButton.addMouseListener(new MouseAdapter() {
      public void mousePressed(java.awt.event.MouseEvent evt) {
        f.remove(panel);
        f.repaint();
        f.setSize(screenSize.width/7, screenSize.height/2);
        f.setLayout(gridBagLayout);
        GridBagConstraints constraints = new GridBagConstraints();
        constraints.gridx = 0;
        constraints.gridy = 0;
        constraints.weightx = 1.0;
        constraints.weighty = 0.0;
        constraints.fill = GridBagConstraints.HORIZONTAL;
        f.add(PrintPanel2, constraints);
        constraints.gridx = 0;
        constraints.gridy = 1;
        constraints.weightx = 1.0;
        constraints.weighty = 0.0;
        constraints.fill = GridBagConstraints.HORIZONTAL;
        f.add(PrintPanel, constraints);

        constraints.gridx = 0;
        constraints.gridy = 2;
        constraints.weightx = 1.0;
        constraints.weighty = 1.0;
        constraints.fill = GridBagConstraints.BOTH;
        f.add(ButtonPanel, constraints);
        f.setVisible(true);
        f.revalidate();
      }
    });
    graphButton.addMouseListener(new MouseAdapter() {
      public void mousePressed(java.awt.event.MouseEvent evt) {
        f.setSize(screenSize.width/2, screenSize.height/2);
        f.remove(PrintPanel);
        f.remove(PrintPanel2);
        f.remove(ButtonPanel);
        f.repaint();
        f.getContentPane().setLayout(new BorderLayout());
        f.getContentPane().add(panel, BorderLayout.CENTER);
        f.setVisible(true);
        f.revalidate();
      }
    });
 }
  public static class Graph extends JPanel {
    public Graph() {
      setBorder(BorderFactory.createLineBorder(Color.BLACK));
      setBackground(Color.BLACK);
    }
  }
}

这是呈现相同问题的简化代码 我尝试在每个更改块后重新绘制框架，我尝试检查添加到框架中的组件数量，但所有组件都已添加，因此它们一定不可见，所以我尝试为我的所有组件调用 setVisible(true) 方法成分。看到它在按下 graphButton 然后再次按下 calcButton 后起作用，我尝试使用 doClick() 方法使其自动化，但它仍然不起作用。