java - 如何构建 2 个相同宽度的 JButton 实例

Question

我有 2 个按钮，一个名为 btnShort，一个名为 btnLong。我希望它们具有相同的宽度，那么最好的选择是什么？

import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;


public class TestCode2 {

public static void main(String[] args) {

    JFrame window = new JFrame("Test2");
    window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    window.setSize(400, 200);

    // ---------------------------------------------------------------------

    GridBagLayout layout = new GridBagLayout();
    GridBagConstraints constraints = new GridBagConstraints();

    JPanel container = new JPanel(layout);
    window.add(container);

    constraints.gridy = 0;

    JButton btnShort = new JButton("Short");
    layout.setConstraints(btnShort, constraints);
    container.add(btnShort);

    constraints.gridy = 1;

    JButton btnLong = new JButton("That's a long button");
    layout.setConstraints(btnLong, constraints);
    container.add(btnLong);

    //This one won't work because button dimension is not known yet...
    //btnShort.setPreferredSize(new Dimension(btnLong.getWidth(), btnLong.getHeight()));

    // ---------------------------------------------------------------------

    window.setVisible(true);
}

}

Answer 1

将 GridBagConstraints 填充属性设置为 GridBagConstraints.HORIZONTAL，以便两个 JButton 组件在容器中占据相同的宽度

constraints.fill = GridBagConstraints.HORIZONTAL;