Java GUI 布局不太正确

Question

我尝试了很多不同的布局，但没有一个能给我想要的效果。

我想要这样的东西:

+-----------------------------+
         Centered Text
+-------+
|Button |
+-------+
+-----------------------------+

在 html 中它可能看起来像这样:

<p align="center">Some text</p>
<input type="button" value="Press"/>

我遇到的问题是某些布局(BorderLayout)它喜欢调整按钮大小以适应。其他布局(Boxlayout 和 GroupLayout)将执行类似以下操作:

+-----------------------------+
         Centered Text
               +-------+
               |Button |
               +-------+
+-----------------------------+

即使我将 JLabel 对齐到 CENTER，将 Button 对齐到 LEFT。

非常感谢我的帮助者。

Answer 1

有很多布局可以实现这一点，事实上，您甚至可以一起使用 BorderLayout 和 FlowLayout 来做到这一点，但是这个示例仅使用 GridBagLayout

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class ExampleLayout {

    public static void main(String[] args) {
        new ExampleLayout();
    }

    public ExampleLayout() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(new TestPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class TestPane extends JPanel {

        public TestPane() {
            setLayout(new GridBagLayout());
            GridBagConstraints gbc = new GridBagConstraints();
            gbc.gridx = 0;
            gbc.gridy = 0;
            gbc.fill = GridBagConstraints.HORIZONTAL;
            gbc.gridwidth = GridBagConstraints.REMAINDER;
            gbc.weightx = 1;

            JLabel center = new JLabel("Centered Text");
            center.setHorizontalAlignment(JLabel.CENTER);
            add(center, gbc);

            gbc.gridy++;
            gbc.fill = GridBagConstraints.NONE;
            gbc.gridwidth = 1;
            gbc.weightx = 0;
            gbc.anchor = GridBagConstraints.WEST;

            JButton button = new JButton("Button");
            add(button, gbc);
        }
    }

}

看看Laying Out Components Within a Container了解更多示例和详细信息