java - GridLayout 中心溢出组件

Question

我有一组按钮。我的 JPanel 有 GridLayout 布局。我希望任何组件都在正方形之外才能居中。这是一张图片:http://screencast.com/t/z86ldR9vh

我希望“选项”按钮位于组下方的中心。

提前致谢!

Answer 1

为“选项”按钮创建另一个 JPanel 并将其设置为流布局。例如，假设顶部面板称为“panel1”，底部面板称为“panel2”:

// create top panel with first four buttons
JPanel panel1 = new JPanel(new GridLayout(2, 2));
panel1.add(new JButton("Play"));
panel1.add(new JButton("New Game"));
panel1.add(new JButton("Save Game"));
panel1.add(new JButton("Load Game"));

// create bottom panel with "Options" button
JPanel panel2 = new JPanel(new FlowLayout());
panel2.add(new JButton("Options"));

或者，如果您想要该类的完整代码(包含所有导入):

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JButton;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.GridLayout;

public class Buttons {
    public static void main(String[] args) {
        Buttons gui = new Buttons();
    }

    public Buttons() {
        // create frame
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(new Dimension(250, 150));
        frame.setLayout(new FlowLayout());
        frame.setVisible(true);

        // create top panel with first four buttons
        JPanel panel1 = new JPanel(new GridLayout(2, 2));
        panel1.add(new JButton("Play"));
        panel1.add(new JButton("New Game"));
        panel1.add(new JButton("Save Game"));
        panel1.add(new JButton("Load Game"));

        // create bottom panel with "Options" button
        JPanel panel2 = new JPanel(new FlowLayout());
        panel2.add(new JButton("Options"));

        // add panels to frame
        frame.add(panel1);
        frame.add(panel2);
    }   
}