在Swing中需要以下UI

我需要 JFrame 上的以下 UI。兩個 Jlabel 垂直左對齊。Jlabel 水平下方的兩個按鈕。我嘗試了下面的代碼，但它是連續出現的。

標簽應左對齊并垂直對齊。按鈕應覆寫 Jframe 的所有寬度。

import javax.swing.*;
import java.awt.*;

public class CustomPanel {
    private JFrame frame = new JFrame();
    private JPanel basePanel= new JPanel();
    public static void main(String []args){
       CustomPanel cp= new CustomPanel();
       cp.showUI();
    }
    private void addui(){

        JPanel  labelPanel = new JPanel();
        labelPanel.setLayout(new GridBagLayout());
        JLabel label11 = new JLabel("I am here to test");
        JLabel label12 = new JLabel("I am here to test row");
        GridBagConstraints gbc = new GridBagConstraints();

        gbc.gridx = 0;
        gbc.gridy = 0;
        gbc.fill = GridBagConstraints.BOTH;

        labelPanel.add(label11, gbc);

        gbc.gridy  ;
        gbc.gridwidth = 2;

        labelPanel.add(label12, gbc);
        basePanel.add(labelPanel);


        /////////////// button panel//////////
        JPanel panel = new JPanel();
        panel.setLayout(new GridLayout(0, 2, 5, 5));
        panel.add(new JButton("Click me"));
        panel.add(new JButton("Click me22"));
        basePanel.add(panel);


    }
    private void showUI(){
        JFrame.setDefaultLookAndFeelDecorated(true);
        addui();
        frame.setAlwaysOnTop(true);
        frame.setType(Window.Type.UTILITY);
        frame.setResizable(true);
        frame.getContentPane().setLayout(new BorderLayout());
        JScrollPane scrollPane = new JScrollPane(basePanel);
        scrollPane.setPreferredSize(new Dimension(400, 250));
        frame.getContentPane().add(scrollPane);
        frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
        frame.setSize(500, 300);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }
}

uj5u.com熱心網友回復：

Oracle 有一個有用的教程，

Swing 應用程式必須以呼叫該SwingUtilities invokeLater方法開始。此方法確保在Event Dispatch Thread上創建和執行 Swing 組件。

我用不同的方法創建了JFrame和三個JPanels。這使我可以一次專注于 GUI 的一部分，并使代碼更易于閱讀和遵循。這也讓我可以試驗不同的 Swing 布局管理器，看看哪一個適合 GUI。

這是完整的可運行代碼。

import java.awt.BorderLayout;
import java.awt.GridLayout;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

public class CustomPanel implements Runnable {

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new CustomPanel());
    }

    @Override
    public void run() {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        frame.add(createMainPanel(), BorderLayout.CENTER);

        frame.pack();
        frame.setLocationByPlatform(true);
        frame.setVisible(true);
    }

    private JPanel createMainPanel() {
        JPanel panel = new JPanel(new BorderLayout());
        panel.setBorder(BorderFactory.createEmptyBorder(0, 5, 5, 5));

        panel.add(createLabelPanel(), BorderLayout.NORTH);
        panel.add(createButtonPanel(), BorderLayout.SOUTH);

        return panel;
    }

    private JPanel createLabelPanel() {
        JPanel panel = new JPanel(new BorderLayout());
        panel.setBorder(BorderFactory.createEmptyBorder(0, 5, 5, 5));

        JLabel label11 = new JLabel("I am here to test");
        panel.add(label11, BorderLayout.NORTH);

        JLabel label12 = new JLabel("I am here to test row");
        panel.add(label12, BorderLayout.SOUTH);

        return panel;
    }

    private JPanel createButtonPanel() {
        JPanel panel = new JPanel(new GridLayout(0, 2, 5, 5));
        panel.setBorder(BorderFactory.createEmptyBorder(0, 5, 5, 5));

        JButton button = new JButton("Click me");
        panel.add(button);

        button = new JButton("Click me22");
        panel.add(button);

        return panel;
    }

}

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