Java Swing - 如何布局JButton作为GridLayout的表...

import java.awt.Component;
import java.awt.Dimension;

import javax.swing.Box;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.border.EmptyBorder;

public class Main extends JFrame {
  public Main() {
    Box box = Box.createHorizontalBox();
    box.setBorder(new EmptyBorder(5, 5, 5, 5));
    Dimension size = new Dimension(100, 25);

    box.add(createButton("Button1", size));
    box.add(createStrut());
    box.add(createButton("Button2", size));
    box.add(createStrut());
    box.add(createButton("Button3", size));
    box.add(createStrut());
    box.add(createButton("Button4", size));

    add(box);
  }

  private JButton createButton(String text, Dimension size) {
    JButton button = new JButton(text);
    button.setPreferredSize(size);
    button.setMinimumSize(size);
    button.setMaximumSize(size);
    return button;
  }

  private Component createStrut() {
    JComponent component = (JComponent) Box.createHorizontalStrut(5);
    component.setMinimumSize(new Dimension(0, 0));
    component.setMaximumSize(new Dimension(Short.MAX_VALUE, Short.MAX_VALUE));
    return component;
  }

  public static void main(String[] args) {
    Main frame = new Main();
    frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
    frame.pack();
    frame.setVisible(true);
  }
}