Question

我正在尝试获得以下布局

标签.................. NumericField
Label2的................ NumericField
Label3333 .......... NumericField

基本上（。）点是空的空间。我曾尝试使用GridBagLayout将标签的gridwidth设为5，将NumericField的gridwidth设为1.我在下面发布代码。但我没有看到所需的结果，我看到所有组件在中心对齐，而不是标签位于左边界，而NF则位于右边界。

对于标签：

    GridBagConstraints localC = new GridBagConstraints();
    localC.anchor  = GridBagConstraints.FIRST_LINE_START;
    //localC.fill = GridBagConstraints.HORIZONTAL;
    localC.weightx = 1.0;
    localC.weighty = 1.0;
    localC.gridx    = 0;
    localC.gridy    = 0;
    localC.gridheight = 1;
    localC.gridwidth  = 5;
    localC.insets = new Insets(0, 0, 0, 0);

对于NumericFields

    localC.anchor = GridBagConstraints.RELATIVE;
    localC.weightx = 0.5;
    localC.weighty = 0.5;
    localC.gridx = 1;
    localC.gridy = 0;
    localC.gridheight = 1;
    localC.gridwidth  = 1;

我是JAVA的新手并且一般都在努力应对布局。

Answer 1

向Insets right属性添加一个值，该属性会将该像素数添加到列的右侧。您还可以使用GridBagConstraints#anchor设置为GridBagConstraints.WEST，这将强制列中的组件位于＆＃34;列＆＃34;的左侧，这可确保在组件时在列中更宽，它们不会被放置在结果空间的中间。

gridwidth确定给定单元格如何跨越多列，但如果结果列中没有其他组件，则它们将被丢弃（默认为0），因此在您的布局中，它＆＃39; s毫无意义。

请参阅How to Use GridBagLayout更多详情

GridBagLayout

import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class Test {

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

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

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                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.anchor = GridBagConstraints.WEST;
            gbc.insets = new Insets(0, 0, 0, 12);

            add(new JLabel("Label"), gbc);
            gbc.gridy++;
            add(new JLabel("Label2"), gbc);
            gbc.gridy++;
            add(new JLabel("Label3333"), gbc);

            gbc.gridx = 1;
            gbc.gridy = 0;
            gbc.insets = new Insets(0, 0, 0, 0);

            add(new JTextField(10), gbc);
            gbc.gridy++;
            add(new JTextField(10), gbc);
            gbc.gridy++;
            add(new JTextField(10), gbc);
        }

    }

}

调试GridBagLayout - 组件集中到中心

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