在Swing GUI中提供空白

A GUI with no white space appears 'crowded'. How can I provide white space without resorting to explicitly setting the position or size of components?­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­

没有白色空间的GUI显得“拥挤”。如何提供空白，而不需要显式设置位置或大小?组件?­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­

6 个解决方案

#1

Using various LayoutManagers one can provide spacing between various components.

使用不同的LayoutManagers可以提供不同组件之间的间隔。

1.) BorderLayout :

• Overloaded Constructor : BorderLayout(int horizontalGap, int verticalGap)
• 重载构造函数:边界布局(int horizontalGap, int verticalGap)

• Getter and setter methods

  Getter和setter方法

  For Horizontal Spacing : BorderLayout.getHgap() and BorderLayout.setHgap(int hgap)

  用于水平间距:边界。gethgap()和边界布局。setHgap(int hgap)

  For Vertical Spacing : BorderLayout.getVgap() and BorderLayout.setVgap()

  对于垂直间距:BorderLayout.getVgap()和BorderLayout.setVgap()

2.) FlowLayout :

• Overloaded Constructor : FlowLayout(int align, int hgap, int vgap)
• 重载构造函数:FlowLayout(int对齐，int hgap, int vgap)

• Getter and setter methods

  Getter和setter方法

  For Horizontal Spacing : FlowLayout.getHgap() and FlowLayout.setHgap(int hgap)

  用于水平间距:FlowLayout.getHgap()和FlowLayout。setHgap(int hgap)

  For Vertical Spacing : FlowLayout.getVgap() and FlowLayout.setVgap()

  对于垂直间距:FlowLayout.getVgap()和FlowLayout.setVgap()

3.) GridLayout :

• Overloaded Constructor : GridLayout(int rows, int columns, int hgap, int vgap)
• 重载构造函数:GridLayout(int行、int列、int hgap、int vgap)

• Getter and setter methods

  Getter和setter方法

  For Horizontal Spacing : GridLayout.getHgap() and GridLayout.setHgap(int hgap)

  用于水平间距:GridLayout.getHgap()和GridLayout。setHgap(int hgap)

  For Vertical Spacing : GridLayout.getVgap() and GridLayout.setVgap()

  对于垂直间距:GridLayout.getVgap()和GridLayout.setVgap()

4.) GridBagLayout :

GridBagConstraints.insets

GridBagConstraints.insets

5.) CardLayout (example) :

CardLayout(int hGap, int vGap)

hGap CardLayout(int,int vGap)

Example to display all constructors in action :

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class LayoutExample {

    private final int hGap = 5;
    private final int vGap = 5;

    private String[] borderConstraints = {
        BorderLayout.PAGE_START,
        BorderLayout.LINE_START,
        BorderLayout.CENTER,
        BorderLayout.LINE_END,
        BorderLayout.PAGE_END
    };

    private JButton[] buttons;

    private GridBagConstraints gbc;

    private JPanel borderPanel;
    private JPanel flowPanel;
    private JPanel gridPanel;
    private JPanel gridBagPanel;
    private JPanel cardPanel;

    public LayoutExample() {
        buttons = new JButton[16];
        gbc = new GridBagConstraints();
        gbc.anchor = GridBagConstraints.FIRST_LINE_START;   
        gbc.insets = new Insets(hGap, vGap, hGap, vGap);        
    }

    private void displayGUI() {
        JFrame frame = new JFrame("Layout Example");
        frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

        JPanel contentPane = new JPanel(
                        new GridLayout(0, 1, hGap, vGap));
        contentPane.setBorder(
            BorderFactory.createEmptyBorder(hGap, vGap, hGap, vGap));
        borderPanel = new JPanel(new BorderLayout(hGap, vGap));
        borderPanel.setBorder(
            BorderFactory.createTitledBorder("BorderLayout"));
        borderPanel.setOpaque(true);
        borderPanel.setBackground(Color.WHITE);
        for (int i = 0; i < 5; i++) {
            buttons[i] = new JButton(borderConstraints[i]);
            borderPanel.add(buttons[i], borderConstraints[i]);
        }
        contentPane.add(borderPanel);

        flowPanel = new JPanel(new FlowLayout(
                    FlowLayout.CENTER, hGap, vGap));
        flowPanel.setBorder(
            BorderFactory.createTitledBorder("FlowLayout"));
        flowPanel.setOpaque(true);
        flowPanel.setBackground(Color.WHITE);
        for (int i = 5; i < 8; i++) {
            buttons[i] = new JButton(Integer.toString(i));
            flowPanel.add(buttons[i]);
        }
        contentPane.add(flowPanel);

        gridPanel = new JPanel(new GridLayout(2, 2, hGap, vGap));
        gridPanel.setBorder(
            BorderFactory.createTitledBorder("GridLayout"));
        gridPanel.setOpaque(true);
        gridPanel.setBackground(Color.WHITE);
        for (int i = 8; i < 12; i++) {
            buttons[i] = new JButton(Integer.toString(i));
            gridPanel.add(buttons[i]);
        }
        contentPane.add(gridPanel);

        gridBagPanel = new JPanel(new GridBagLayout());
        gridBagPanel.setBorder(
            BorderFactory.createTitledBorder("GridBagLayout"));
        gridBagPanel.setOpaque(true);
        gridBagPanel.setBackground(Color.WHITE);
        buttons[12] = new JButton(Integer.toString(12));
        addComp(gridBagPanel, buttons[12], 0, 0, 1, 1
                            , GridBagConstraints.BOTH, 0.33, 0.5);
        buttons[13] = new JButton(Integer.toString(13));
        addComp(gridBagPanel, buttons[13], 1, 0, 1, 1
                            , GridBagConstraints.BOTH, 0.33, 0.5);
        buttons[14] = new JButton(Integer.toString(14));
        addComp(gridBagPanel, buttons[14], 0, 1, 2, 1
                            , GridBagConstraints.BOTH, 0.66, 0.5);
        buttons[15] = new JButton(Integer.toString(15));
        addComp(gridBagPanel, buttons[15], 2, 0, 1, 2
                            , GridBagConstraints.BOTH, 0.33, 1.0);
        contentPane.add(gridBagPanel);

        cardPanel = new JPanel(new CardLayout(hGap, vGap));
        cardPanel.setBorder(
            BorderFactory.createTitledBorder("CardLayout"));
        cardPanel.setOpaque(true);
        cardPanel.setBackground(Color.WHITE);
        cardPanel.add(getPanel(Color.BLUE));
        cardPanel.add(getPanel(Color.GREEN));
        contentPane.add(cardPanel);

        frame.setContentPane(contentPane);
        frame.pack();
        frame.setLocationByPlatform(true);
        frame.setVisible(true);
    }

    private JPanel getPanel(Color bColor) {
        JPanel panel = new JPanel(new FlowLayout(
                    FlowLayout.CENTER, hGap, vGap));
        panel.setOpaque(true);
        panel.setBackground(bColor.darker().darker());
        JButton swapperButton = new JButton("Next");
        swapperButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent ae) {
                CardLayout cardLayout = (CardLayout) cardPanel.getLayout();
                cardLayout.next(cardPanel);
            }
        });

        panel.add(swapperButton);

        return panel;
    }

    private void addComp(JPanel panel, JComponent comp
                                , int x, int y, int gWidth
                                    , int gHeight, int fill
                                        , double weightx, double weighty) {
        gbc.gridx = x;
        gbc.gridy = y;
        gbc.gridwidth = gWidth;
        gbc.gridheight = gHeight;
        gbc.fill = fill;
        gbc.weightx = weightx;
        gbc.weighty = weighty;      

        panel.add(comp, gbc);
    }

    public static void main(String[] args) {
        Runnable runnable = new Runnable(){
            @Override
            public void run() {
                new LayoutExample().displayGUI();
            }
        };
        EventQueue.invokeLater(runnable);
    }
}

OUTPUT :

#2

There are a number of ways in a Swing GUI to provide a separation between components, and white space around components:

Swing GUI中有许多方法来提供组件之间的分离，以及组件周围的空白:

• JToolBar has the methods addSeparator() & addSeparator(Dimension).
• JToolBar具有addSeparator()和addSeparator(维度)方法。
• JMenu uses a spacing component better suited to menus, available through addSeparator().
• JMenu使用了一个更适合于菜单的间距组件，可以通过addSeparator()来使用。

But more generally, look to:

但更普遍的是:

• The spacing as can be defined in the layout constructors.
• 布局构造函数中可以定义的间距。
• Borders.
• 边界。

Here is an example of using the layout separator hGap & vGap values & borders (specifically an EmptyBorder) to provide 'white' (actually shown as red to make it very obvious) space. Adjust the spinners to see the result.

这里有一个使用布局分隔符hGap & vGap值和边框(特别是一个EmptyBorder)来提供“白色”(实际上显示为红色，以便非常明显)空间的示例。调整旋转器以查看结果。

import java.awt.*;
import javax.swing.*;
import javax.swing.border.EmptyBorder;
import javax.swing.event.*;

public class WhiteSpace {

    private JPanel gui = null;
    private BorderLayout mainLayout;
    private FlowLayout buttonLayout;
    private EmptyBorder border;

    public Container getGui() {
        if (gui==null) {
            mainLayout = new BorderLayout(0,0);
            gui = new JPanel(mainLayout);
            gui.setBackground(Color.RED);
            border = new EmptyBorder(0,0,0,0);

            JTree tree = new JTree();
            tree.setVisibleRowCount(10);
            for (int ii = tree.getRowCount(); ii>-1; ii--) {
                tree.expandRow(ii);
            }
            gui.add(new JScrollPane(
                    tree, 
                    JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
                    JScrollPane.HORIZONTAL_SCROLLBAR_NEVER), 
                    BorderLayout.LINE_START);
            gui.add(new JScrollPane(new JTextArea(10,30)));

            buttonLayout = new FlowLayout(FlowLayout.CENTER,0,0);
            JPanel buttonPanel = new JPanel(buttonLayout);
            gui.add(buttonPanel, BorderLayout.PAGE_START);

            buttonPanel.add(new JLabel("H Gap"));
            final JSpinner hSpinner = 
                    new JSpinner(new SpinnerNumberModel(0,0,15,1));
            buttonPanel.add(hSpinner);

            buttonPanel.add(new JLabel("V Gap"));
            final JSpinner vSpinner = 
                    new JSpinner(new SpinnerNumberModel(0,0,15,1));
            buttonPanel.add(vSpinner);

            buttonPanel.add(new JLabel("H Border"));
            final JSpinner hBorderSpinner = 
                    new JSpinner(new SpinnerNumberModel(0,0,15,1));
            buttonPanel.add(hBorderSpinner);

            buttonPanel.add(new JLabel("V Border"));
            final JSpinner vBorderSpinner = 
                    new JSpinner(new SpinnerNumberModel(0,0,15,1));
            buttonPanel.add(vBorderSpinner);

            ChangeListener changeListener = new ChangeListener() {

                @Override
                public void stateChanged(ChangeEvent e) {
                    int hGap = ((Integer)hSpinner.getValue()).intValue();
                    int vGap = ((Integer)vSpinner.getValue()).intValue();
                    int hBorder = ((Integer)hBorderSpinner.getValue()).intValue();
                    int vBorder = ((Integer)vBorderSpinner.getValue()).intValue();
                    adjustWhiteSpace(hGap,vGap,hBorder,vBorder);
                }
            };

            hSpinner.addChangeListener(changeListener);
            vSpinner.addChangeListener(changeListener);
            hBorderSpinner.addChangeListener(changeListener);
            vBorderSpinner.addChangeListener(changeListener);
        }

        return gui;
    }

    private void adjustWhiteSpace(int hGap, int vGap, int hBorder, int vBorder) {
        mainLayout.setHgap(hGap);
        mainLayout.setVgap(vGap);
        buttonLayout.setHgap(hGap);
        gui.setBorder(new EmptyBorder(vBorder,hBorder,vBorder,hBorder));
        Container c = gui.getTopLevelAncestor();
        if (c instanceof Window) {
            Window w = (Window)c;
            w.pack();
        }
    }

    public static void main(String[] args) {
        Runnable r = new Runnable() {

            @Override
            public void run() {
                WhiteSpace ws = new WhiteSpace();
                // the GUI as seen by the user (without frame)
                Container gui = ws.getGui();

                JFrame f = new JFrame("White (OK Red) Space");
                f.add(gui);
                // Ensures JVM closes after frame(s) closed and
                // all non-daemon threads are finished
                f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
                // See http://*.com/a/7143398/418556 for demo.
                f.setLocationByPlatform(true);

                // ensures the frame is the minimum size it needs to be
                // in order display the components within it
                f.setResizable(false);
                f.pack();
                // should be done last, to avoid flickering, moving,
                // resizing artifacts.
                f.setVisible(true);
            }
        };
        SwingUtilities.invokeLater(r);
    }
}

#3

When you use BoxLayout, Box.createVerticalGlue() method can help you to make some white space.

使用BoxLayout时，Box.createVerticalGlue()方法可以帮助您创建一些空白。

Another method is BorderFactory.createEmptyBorder(int top, int left, int bottom, int right). It can help you to make some white space around component.

另一种方法是BorderFactory。createEmptyBorder(int top, int left, int bottom, int right)。它可以帮助您在组件周围创建一些空白。

Thanks for Andrew Thompson's remind.I've revised BoxLayout in recent days and I find that Box.createVerticalGlue() can add some white space depend on the panel's size and you can not set the explicit pixel value of the length of white space.But Box.createVerticalStrut() can do that. Here is a MCTaRE and show the effect of those two methods.

谢谢安德鲁·汤普森的提醒。最近几天我修改了BoxLayout，我发现Box.createVerticalGlue()可以根据面板的大小添加一些空格，不能设置空格长度的显式像素值。但是Box.createVerticalStrut()可以做到这一点。这是一个麦克塔尔和显示这两种方法的效果。

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.*;

public class WhiteSpace extends JFrame{
    static WhiteSpace whiteSpace;
    DemoPanel demoPanel;
    boolean withGlue;
    JSpinner spinner;

    public WhiteSpace(){
        initialWindow();
        demoPanel = new DemoPanel();
        ActionPanel actionPanel = new ActionPanel();

        setLayout(new BorderLayout());

        getContentPane().add(actionPanel,BorderLayout.NORTH);
        getContentPane().add(demoPanel,BorderLayout.CENTER);
            setVisible(true);
    }

    public void initialWindow(){
        setSize(220, 300);
        setTitle("White Space");
        setResizable(false);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
        //Show the window in the middle of the screen
    }

    /**
     * @param args
     */
    public static void main(String[] args) {
        Runnable runnable = new Runnable() {
            @Override
            public void run() {
                whiteSpace = new WhiteSpace();
            }
        };
        SwingUtilities.invokeLater(runnable);
    }

    class DemoPanel extends JPanel{
        //Show the vertical white space between label1 and label2
        JLabel label1;
        JLabel label2;
        public void initialDemoPanel(){
            setBorder(BorderFactory.createTitledBorder(getBorder(), "DemoPanel", TitledBorder.LEADING, TitledBorder.TOP, new Font("Default",Font.PLAIN,10), Color.gray));
            setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));

            label1 = new JLabel("This is first line");
            label2 = new JLabel("This is second line");
        }

        public DemoPanel(){
            initialDemoPanel();
            add(label1);
            if(withGlue){
                add(Box.createVerticalGlue());
            }
            add(label2);
        }

        public DemoPanel(int strutValue){
            initialDemoPanel();
            add(label1);
            add(Box.createVerticalStrut(strutValue));
            add(label2);
        }
    }

    class ActionPanel extends JPanel{
        public ActionPanel(){
            setBorder(BorderFactory.createTitledBorder(getBorder(), "ActionPanel", TitledBorder.LEADING, TitledBorder.TOP, new Font("Default",Font.PLAIN,10), Color.gray));

            setLayout(new BoxLayout(this,BoxLayout.X_AXIS));
            JRadioButton glueButton = new JRadioButton("With Glue");
            glueButton.addActionListener(new glueButtonListener());
            add(glueButton);

            add(Box.createHorizontalStrut(10));
            //To create horizontal white space
            JLabel strutLabel = new JLabel("Strut Value");
            add(strutLabel);
            spinner = new JSpinner(new SpinnerNumberModel(0,0,50,1));
            spinner.addChangeListener(new spinnerListener());
            add(spinner);
            //public SpinnerNumberModel(Number value,Comparable minimum,Comparable maximum,Number stepSize)
        }
    }

    class glueButtonListener implements ActionListener{
        @Override
        public void actionPerformed(ActionEvent e) {
            spinner.setValue(new Integer(0));
            withGlue = (withGlue == true ? false:true);
            whiteSpace.getContentPane().remove(demoPanel);
            demoPanel = new DemoPanel();
            whiteSpace.getContentPane().add(demoPanel,BorderLayout.CENTER);
            whiteSpace.getContentPane().validate();
        }
    }

    class spinnerListener implements ChangeListener{

        @Override
        public void stateChanged(ChangeEvent e) {
            int strutValue = (Integer) spinner.getValue();
            whiteSpace.getContentPane().remove(demoPanel);
            demoPanel = new DemoPanel(strutValue);
            whiteSpace.getContentPane().add(demoPanel,BorderLayout.CENTER);
            whiteSpace.getContentPane().validate();
        }
    }
}

Box.createHorizontalGlue() and Box.createHorizontalStrut(int height) can be used too. Besides, Box.createRigidArea(Dimension d) has the ability too create white space too.

Box.createHorizontalGlue()和盒子。createHorizontalStrut(int height)也可以使用。此外,盒子。肌酐区(维度d)也有创造空白的能力。

#4

MigLayout has multiple ways of creating space. (A space is called a gap in this layout.) Gaps can be created at the highest level with layout constraints, it is possible to create gaps between rows and column and gaps can be also set between individual components with component constraints. There are also specific gaps around the borders of a container called insets which have their own specific keyword to be set.

MigLayout有多种创建空间的方法。(在这个布局中，空格被称为间隙。)可以在具有布局约束的*别创建间隔，可以在行和列之间创建间隔，也可以在具有组件约束的各个组件之间设置间隔。在称为insets的容器的边界上也有一些特定的空白，它们有自己的特定关键字要设置。

The following example creates all these kinds of gaps:

下面的例子造成了所有这些差距:

package com.zetcode;

import java.awt.EventQueue;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import net.miginfocom.swing.MigLayout;


public class MigLayoutGaps2 extends JFrame {

    public MigLayoutGaps2() {

        initUI();

        setTitle("Gaps");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
    }

    private void initUI() {

        JPanel base = new JPanel(new MigLayout("flowy, ins 30, gap 15"));
        setContentPane(base);

        JPanel pnl1 = new JPanel();
        pnl1.setBorder(
                BorderFactory.createTitledBorder("Grid gaps")
        );

        pnl1.setLayout(new MigLayout("gap 5 5, ins 10, wrap 3"));

        pnl1.add(new JButton("1"));
        pnl1.add(new JButton("2"));
        pnl1.add(new JButton("3"));
        pnl1.add(new JButton("4"));
        pnl1.add(new JButton("5"));
        pnl1.add(new JButton("6"));

        JPanel pnl2 = new JPanel();
        pnl2.setBorder(
                BorderFactory.createTitledBorder("Column gaps")
        );

        pnl2.setLayout(new MigLayout("wrap 3", "[]10[]"));

        JLabel lbl1 = new JLabel();
        lbl1.setBorder(
            BorderFactory.createEtchedBorder()
        );

        JLabel lbl2 = new JLabel();
        lbl2.setBorder(
            BorderFactory.createEtchedBorder()
        );

        JLabel lbl3 = new JLabel();
        lbl3.setBorder(
            BorderFactory.createEtchedBorder()
        );        

        pnl2.add(lbl1, "w 40, h 110");
        pnl2.add(lbl2, "w 40, h 110");
        pnl2.add(lbl3, "w 40, h 110");

        JPanel pnl3 = new JPanel();
        pnl3.setBorder(
                BorderFactory.createTitledBorder("Row gaps")
        );

        pnl3.setLayout(new MigLayout("wrap", "", "[]15[]"));

        JLabel lbl4 = new JLabel();
        lbl4.setBorder(
            BorderFactory.createEtchedBorder()
        );

        JLabel lbl5 = new JLabel();
        lbl5.setBorder(
            BorderFactory.createEtchedBorder()
        );

        JLabel lbl6 = new JLabel();
        lbl6.setBorder(
            BorderFactory.createEtchedBorder()
        );        

        pnl3.add(lbl4, "w 150, h 20");
        pnl3.add(lbl5, "w 150, h 20");
        pnl3.add(lbl6, "w 150, h 20");        

        JPanel pnl4 = new JPanel();
        pnl4.setBorder(
                BorderFactory.createTitledBorder("Component gaps")
        );

        pnl4.setLayout(new MigLayout());

        pnl4.add(new JLabel("Name:"), "gapright 5");
        pnl4.add(new JTextField(10), "gapbottom 20, gaptop 20");

        base.add(pnl1);
        base.add(pnl2);
        base.add(pnl3);
        base.add(pnl4);

        pack();
    }

    public static void main(String[] args) {

        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                MigLayoutGaps2 ex = new MigLayoutGaps2();
                ex.setVisible(true);
            }
        });
    }
}

We have four panels in the layout. Each of this panels has a MigLayout manager.

我们在布局上有四个面板。每个面板都有一个MigLayout管理器。

JPanel base = new JPanel(new MigLayout("flowy, ins 30, gap 15"));

This line creates container insets and vertical gaps between panels.

这一行创建了容器嵌套和面板之间的垂直间隙。

pnl1.setLayout(new MigLayout("gap 5 5, ins 10, wrap 3"));

Here we apply gaps for the whole grid structure and also set container gaps.

在这里，我们对整个网格结构应用间隙，并设置容器间隙。

pnl2.setLayout(new MigLayout("wrap 3", "[]10[]"));

This line creates gaps between columns.

这一行创建列之间的间隙。

pnl3.setLayout(new MigLayout("wrap", "", "[]15[]"));

Row gaps are defined with this code.

这段代码定义了行间距。

pnl4.add(new JLabel("Name:"), "gapright 5");
pnl4.add(new JTextField(10), "gapbottom 20, gaptop 20");

Finally, it is possible to create gaps between individual components.

最后，可以在各个组件之间创建间隔。

#5

JGoodies FormLayout.

JGoodies FormLayout。

Author Karsten Lentzsch has a collection of presentations on UI design. In particular this PDF speaks to the need for aesthetic whitespace. Adding meaningful space while also paying attention to clutter separates the wheat from the chaff.

作者Karsten Lentzsch有一个关于UI设计的介绍集。特别是这个PDF说明了审美空白的需要。增加有意义的空间，同时也注意杂物，把小麦和谷糠区分开来。

#6

Whenever I have this issue, I just use JPanels. For example in a GridLayout:

每当我有这个问题，我就用jpanel。例如在GridLayout中:

JFrame frame = new JFrame;
frame.setLayout(new GridLayout(2, 0));

//We want the bottom left to be blank
frame.add(new JLabel("Top Left"));
frame.add(new JLabel("Top Right"));

//This is the position we want empty
frame.add(new JPanel());

//Now we can continue with the rest of the script

Hope this helped :)

希望这有助于:)