Java JPanel哪种布局

假设我有一个框架，我想在其中创建6个面板，如下所示：

哪种布局最好？我试过这样的方法：

public static void main ( String[] args ) {
        JFrame frame = new JFrame("Testing");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setPreferredSize(new Dimension(800,600));
        frame.setLayout(new FlowLayout(FlowLayout.LEFT));

        JPanel leftTop = new JPanel();
        leftTop.setPreferredSize(new Dimension(251,300));
        leftTop.setBackground(Color.black);
        frame.getContentPane().add(leftTop);

        JPanel middleTop = new JPanel();
        middleTop.setPreferredSize(new Dimension(251,300));
        middleTop.setBackground(Color.white);
        frame.getContentPane().add(middleTop);

        JPanel rightTop = new JPanel();
        rightTop.setPreferredSize(new Dimension(251,300));
        rightTop.setBackground(Color.red);
        frame.getContentPane().add(rightTop);

        JPanel leftBottom = new JPanel();
        leftBottom.setPreferredSize(new Dimension(251,300));
        leftBottom.setBackground(Color.green);
        frame.getContentPane().add(leftBottom);

        JPanel middleBottom = new JPanel();
        middleBottom.setPreferredSize(new Dimension(251,300));
        middleBottom.setBackground(Color.yellow);
        frame.getContentPane().add(middleBottom);

        JPanel rightBottom = new JPanel();
        rightBottom.setPreferredSize(new Dimension(251,300));
        rightBottom.setBackground(Color.black);
        frame.getContentPane().add(rightBottom);

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

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但是如果我改变面板的大小，结果就不会这么好了哈哈。

假设你有一个JFrame，你想要6个JPanel，就像这样：

创建这个GUI的方法是分而治之

您必须通过调用SwingUtilities invokeLater方法来启动Swing应用程序，以便将Swing组件的创建和执行放在服务器上。是的，即使对于小型测试程序也是如此

我为左侧、中间和右侧创建了3个JPanel。每个JPanel都使用一个BorderLayout

是的，我必须为6个内部JPanel指定一个首选尺寸。这是因为6个内部JPanel没有任何内部Swing组件。通常在Swing中，应该让Swing组件自行调整大小

我将左、中、右JPanel封装在主JPanel中。通常，除了JPanel和JScrollPane之外，不应该向JFrame添加任何Swing组件。当你违反这条规则时，会发生无法解释的坏事。我宁愿发现并修复自己的编码错误，也不愿以一种不同寻常的方式使用Java类

这是密码

package com.ggl.testing;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

public class LayoutTest implements Runnable {

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

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

        JPanel mainPanel = new JPanel();
        mainPanel.add(createLeftPanel());
        mainPanel.add(createCenterPanel());
        mainPanel.add(createRightPanel());

        frame.add(mainPanel);

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

    private JPanel createLeftPanel() {
        JPanel panel = new JPanel();
        panel.setLayout(new BorderLayout());

        JPanel leftTop = new JPanel();
        leftTop.setPreferredSize(new Dimension(251, 250));
        leftTop.setBackground(Color.black);
        panel.add(leftTop, BorderLayout.NORTH);

        JPanel leftBottom = new JPanel();
        leftBottom.setPreferredSize(new Dimension(251, 350));
        leftBottom.setBackground(Color.green);
        panel.add(leftBottom, BorderLayout.SOUTH);

        return panel;
    }

    private JPanel createCenterPanel() {
        JPanel panel = new JPanel();
        panel.setLayout(new BorderLayout());

        JPanel middleTop = new JPanel();
        middleTop.setPreferredSize(new Dimension(251, 400));
        middleTop.setBackground(Color.cyan);
        panel.add(middleTop, BorderLayout.NORTH);

        JPanel middleBottom = new JPanel();
        middleBottom.setPreferredSize(new Dimension(251, 200));
        middleBottom.setBackground(Color.yellow);
        panel.add(middleBottom, BorderLayout.SOUTH);

        return panel;
    }

    private JPanel createRightPanel() {
        JPanel panel = new JPanel();
        panel.setLayout(new BorderLayout());

        JPanel rightTop = new JPanel();
        rightTop.setPreferredSize(new Dimension(251, 100));
        rightTop.setBackground(Color.red);
        panel.add(rightTop, BorderLayout.NORTH);

        JPanel rightBottom = new JPanel();
        rightBottom.setPreferredSize(new Dimension(251, 500));
        rightBottom.setBackground(Color.black);
        panel.add(rightBottom, BorderLayout.SOUTH);

        return panel;
    }

}

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看看GridBagLayout：不需要选择布局。您可以嵌套布局；每列使用一个，一个包含列。（

BoxLayout

对两者都适用）。