Java GridBagLayout大小调整高度不正确？

此红色框应仅为屏幕高度的1/6。我根本无法使红盒子的高度降低。我如何确定所有这些的高度

谢谢

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嗯，忽略这一点，它只是要求我提供更多关于代码的上下文，但问题是直截了当的。。。所以如果你喜欢lol这个包的名字，那就是我做的第一个包的名字。班上的一位朋友看到后笑得要死，所以从那以后就一直是这样。

你的

JFrame

应该使用布局来规定相关面板的大小。然后，您可以通过调整

GridBagLayout

的公共字段来调整行和列的权重：

列宽

、

行高

、

列权重

和

行权重

例如：

import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;

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

public class GridBagLayoutExample extends JFrame {
    private static final long serialVersionUID = 1L;
    private JPanel contentPane;

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    GridBagLayoutExample frame = new GridBagLayoutExample();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    public GridBagLayoutExample() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setPreferredSize(new Dimension(450, 450));
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        GridBagLayout gbl_contentPane = new GridBagLayout();
        gbl_contentPane.columnWidths = new int[] { 0, 0, 0, 0 };
        gbl_contentPane.rowHeights = new int[] { 0, 0, 0, 0 };
        gbl_contentPane.columnWeights = new double[] { 1.0, 6.0, 1.0, Double.MIN_VALUE };
        gbl_contentPane.rowWeights = new double[] { 1.0, 6.0, 1.0, Double.MIN_VALUE };
        contentPane.setLayout(gbl_contentPane);

        JPanel top = new JPanel();
        top.setBackground(Color.RED);
        GridBagConstraints gbc_top = new GridBagConstraints();
        gbc_top.gridwidth = 3;
        gbc_top.insets = new Insets(0, 0, 5, 5);
        gbc_top.fill = GridBagConstraints.BOTH;
        gbc_top.gridx = 0;
        gbc_top.gridy = 0;
        contentPane.add(top, gbc_top);

        JPanel left = new JPanel();
        left.setBackground(Color.BLUE);
        GridBagConstraints gbc_left = new GridBagConstraints();
        gbc_left.insets = new Insets(0, 0, 5, 5);
        gbc_left.fill = GridBagConstraints.BOTH;
        gbc_left.gridx = 0;
        gbc_left.gridy = 1;
        contentPane.add(left, gbc_left);

        JPanel middle = new JPanel();
        middle.setBackground(Color.BLACK);
        GridBagConstraints gbc_middle = new GridBagConstraints();
        gbc_middle.insets = new Insets(0, 0, 5, 5);
        gbc_middle.fill = GridBagConstraints.BOTH;
        gbc_middle.gridx = 1;
        gbc_middle.gridy = 1;
        contentPane.add(middle, gbc_middle);

        JPanel right = new JPanel();
        right.setBackground(Color.YELLOW);
        GridBagConstraints gbc_right = new GridBagConstraints();
        gbc_right.insets = new Insets(0, 0, 5, 0);
        gbc_right.fill = GridBagConstraints.BOTH;
        gbc_right.gridx = 2;
        gbc_right.gridy = 1;
        contentPane.add(right, gbc_right);

        JPanel bottom = new JPanel();
        bottom.setBackground(Color.GREEN);
        GridBagConstraints gbc_bottom = new GridBagConstraints();
        gbc_bottom.insets = new Insets(0, 0, 0, 5);
        gbc_bottom.gridwidth = 3;
        gbc_bottom.fill = GridBagConstraints.BOTH;
        gbc_bottom.gridx = 0;
        gbc_bottom.gridy = 2;
        contentPane.add(bottom, gbc_bottom);

        pack();
    }

}

---

无挫折（100100450300）；可能很好code@mKorbel我已经更新为使用

setPreferredSize

和

pack

。setPreferredSize是LayoutManagers API中实现的方法的专用作业，请改用JFrame.setSize（暂时不用），顺便说一句，欢迎来到这里。@mKorbel感谢您的建议。因此，由于

JFrame

本身没有LayoutManager，

setSize

比

setPreferredSize

、

setMinimumSize

更适合在使用LayoutManager时使用，对吗？这很有趣，因为您不需要直接设置MinMaxPreferredSize，但是LayoutManager需要此信息，如果需要，那么您必须为JComponent（尤其是Box/GBCLayout）重写此值，例如JScrollPane、JTable、JComboBox不会将合理的XxxSize返回到容器，这很有趣，但有很多例外（如其他地方）

import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;

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

public class GridBagLayoutExample extends JFrame {
    private static final long serialVersionUID = 1L;
    private JPanel contentPane;

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    GridBagLayoutExample frame = new GridBagLayoutExample();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    public GridBagLayoutExample() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setPreferredSize(new Dimension(450, 450));
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        GridBagLayout gbl_contentPane = new GridBagLayout();
        gbl_contentPane.columnWidths = new int[] { 0, 0, 0, 0 };
        gbl_contentPane.rowHeights = new int[] { 0, 0, 0, 0 };
        gbl_contentPane.columnWeights = new double[] { 1.0, 6.0, 1.0, Double.MIN_VALUE };
        gbl_contentPane.rowWeights = new double[] { 1.0, 6.0, 1.0, Double.MIN_VALUE };
        contentPane.setLayout(gbl_contentPane);

        JPanel top = new JPanel();
        top.setBackground(Color.RED);
        GridBagConstraints gbc_top = new GridBagConstraints();
        gbc_top.gridwidth = 3;
        gbc_top.insets = new Insets(0, 0, 5, 5);
        gbc_top.fill = GridBagConstraints.BOTH;
        gbc_top.gridx = 0;
        gbc_top.gridy = 0;
        contentPane.add(top, gbc_top);

        JPanel left = new JPanel();
        left.setBackground(Color.BLUE);
        GridBagConstraints gbc_left = new GridBagConstraints();
        gbc_left.insets = new Insets(0, 0, 5, 5);
        gbc_left.fill = GridBagConstraints.BOTH;
        gbc_left.gridx = 0;
        gbc_left.gridy = 1;
        contentPane.add(left, gbc_left);

        JPanel middle = new JPanel();
        middle.setBackground(Color.BLACK);
        GridBagConstraints gbc_middle = new GridBagConstraints();
        gbc_middle.insets = new Insets(0, 0, 5, 5);
        gbc_middle.fill = GridBagConstraints.BOTH;
        gbc_middle.gridx = 1;
        gbc_middle.gridy = 1;
        contentPane.add(middle, gbc_middle);

        JPanel right = new JPanel();
        right.setBackground(Color.YELLOW);
        GridBagConstraints gbc_right = new GridBagConstraints();
        gbc_right.insets = new Insets(0, 0, 5, 0);
        gbc_right.fill = GridBagConstraints.BOTH;
        gbc_right.gridx = 2;
        gbc_right.gridy = 1;
        contentPane.add(right, gbc_right);

        JPanel bottom = new JPanel();
        bottom.setBackground(Color.GREEN);
        GridBagConstraints gbc_bottom = new GridBagConstraints();
        gbc_bottom.insets = new Insets(0, 0, 0, 5);
        gbc_bottom.gridwidth = 3;
        gbc_bottom.fill = GridBagConstraints.BOTH;
        gbc_bottom.gridx = 0;
        gbc_bottom.gridy = 2;
        contentPane.add(bottom, gbc_bottom);

        pack();
    }

}