如何将jPanel中的所有jPanel向左对齐？

Question

嘿，我正在尝试将一个面板中的所有面板对齐到较大面板的左侧。

以下是我目前面临的情况：

对于主面板（包含所有其他面板的面板-我将称之为主面板！）我在创建它时使用了以下代码：

    JPanel panel = new JPanel();
    panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));

对于其中的每个面板，我也使用BoxLayout，但是我已经在每个面板上尝试了[jpanel].setAlignmentX（Component.LEFT_ALIGNMENT）之类的东西，但这似乎不起作用。

任何帮助都将不胜感激！

:)

编辑：对于“尺寸框（m）：”标签，有没有办法将其与包含它的面板顶部对齐？它在自己的面板中。

编辑：一旦修复：

下面的解决方案，感谢大家的帮助:)

Answer 1

您可以使用MigLayout:

import java.awt.Color;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import net.miginfocom.swing.MigLayout;

public class PanelAlignment extends JFrame {
    JPanel contentPane = new JPanel();
    JPanel firstPanel = new JPanel();
    JPanel secondPanel = new JPanel();
    JPanel thirdPanel = new JPanel();

    JLabel dimOfBox, rein, seaTop;

    public PanelAlignment() {
        contentPane.setLayout(new MigLayout());

        firstPanel.add(dimOfBox = new JLabel("Dimensions of box (m): "));
        firstPanel.setBorder(BorderFactory.createLineBorder(Color.BLACK));
        contentPane.add(firstPanel,"wrap");

        secondPanel.add(rein = new JLabel("Reinforcement: "));
        secondPanel.setBorder(BorderFactory.createLineBorder(Color.BLACK));
        contentPane.add(secondPanel,"wrap");

        thirdPanel.add(dimOfBox = new JLabel("Sealable top: "));
        thirdPanel.setBorder(BorderFactory.createLineBorder(Color.BLACK));
        contentPane.add(thirdPanel,"wrap");
        add(contentPane);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                PanelAlignment pa = new PanelAlignment();
                pa.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
                pa.pack();
                pa.setVisible(true);
            }
        });
    }

}

你会得到这样的东西：

我最近在这里回答了类似的问题

祝你好运！:)

Answer 2

你有许多可能性，取决于你的所有需求。

我在这里所做的就是使用复合面板并使用GridBagLayout来调整布局

public class BadLayout03 {

    public static void main(String[] args) {
        new BadLayout03();
    }

    public BadLayout03() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                JFrame frame = new JFrame();
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(new MasterPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class MasterPane extends JPanel {

        public MasterPane() {
            setLayout(new GridBagLayout());
            GridBagConstraints gbc = new GridBagConstraints();
            gbc.gridx = 0;
            gbc.gridy = 1;
            gbc.weightx = 1;
            gbc.fill = GridBagConstraints.HORIZONTAL;
            gbc.insets = new Insets(4, 4, 4, 4);
            gbc.anchor = GridBagConstraints.WEST;
            add(new DimensionsPane(), gbc);
            gbc.gridy++;
            add(new ColorPane(), gbc);
            gbc.gridy++;
            add(new ReinforementPane(), gbc);
            gbc.gridy++;
            add(new SealableTopPane(), gbc);
            gbc.gridy++;
            add(new CardGradePane(), gbc);
            gbc.gridy++;
            add(new QuantityPane(), gbc);
            gbc.gridy++;
            add(new OrderPricePane(), gbc);
        }

    }

    public class DimensionsPane extends JPanel {

        public DimensionsPane() {
            setLayout(new GridBagLayout());
            GridBagConstraints gbc = new GridBagConstraints();
            gbc.gridx = 0;
            gbc.gridy = 1;
            gbc.weightx = 1;
            gbc.anchor = GridBagConstraints.WEST;
            add(new JLabel("Dimensions of box (m):"), gbc);

            gbc.gridx = 1;
            gbc.gridy = 0;
            gbc.anchor = GridBagConstraints.EAST;
            add(new JLabel("Length: 33.0"), gbc);
            gbc.gridy++;
            add(new JLabel("Width: 3.0"), gbc);
            gbc.gridy++;
            add(new JLabel("Height: 3.0"), gbc);
        }

    }

    public class ColorPane extends JPanel {

        public ColorPane() {
            setLayout(new GridBagLayout());
            GridBagConstraints gbc = new GridBagConstraints();
            gbc.gridx = 0;
            gbc.gridy = 0;
            gbc.weightx = 1;
            gbc.anchor = GridBagConstraints.WEST;
            add(new JLabel("Colour :"), gbc);

            gbc.gridx = 1;
            gbc.gridy = 0;
            gbc.anchor = GridBagConstraints.EAST;
            add(new JLabel("0"), gbc);
        }

    }

    public class ReinforementPane extends JPanel {

        public ReinforementPane() {
            setLayout(new GridBagLayout());
            GridBagConstraints gbc = new GridBagConstraints();
            gbc.gridx = 0;
            gbc.gridy = 0;
            gbc.weightx = 1;
            gbc.anchor = GridBagConstraints.WEST;
            add(new JLabel("Reinforcement :"), gbc);

            gbc.gridx = 1;
            gbc.gridy = 0;
            gbc.anchor = GridBagConstraints.EAST;
            add(new JLabel("None"), gbc);
        }

    }

    public class SealableTopPane extends JPanel {

        public SealableTopPane() {
            setLayout(new GridBagLayout());
            GridBagConstraints gbc = new GridBagConstraints();
            gbc.gridx = 0;
            gbc.gridy = 0;
            gbc.weightx = 1;
            gbc.anchor = GridBagConstraints.WEST;
            add(new JLabel("Selable top :"), gbc);

            gbc.gridx = 1;
            gbc.gridy = 0;
            gbc.anchor = GridBagConstraints.EAST;
            add(new JLabel("No"), gbc);
        }

    }

    public class CardGradePane extends JPanel {

        public CardGradePane() {
            setLayout(new GridBagLayout());
            GridBagConstraints gbc = new GridBagConstraints();
            gbc.gridx = 0;
            gbc.gridy = 0;
            gbc.weightx = 1;
            gbc.anchor = GridBagConstraints.WEST;
            add(new JLabel("Grade of card:"), gbc);

            gbc.gridx = 1;
            gbc.gridy = 0;
            gbc.anchor = GridBagConstraints.EAST;
            add(new JLabel("1"), gbc);
        }

    }

    public class QuantityPane extends JPanel {

        public QuantityPane() {
            setLayout(new GridBagLayout());
            GridBagConstraints gbc = new GridBagConstraints();
            gbc.gridx = 0;
            gbc.gridy = 0;
            gbc.weightx = 1;
            gbc.anchor = GridBagConstraints.WEST;
            add(new JLabel("Quantity:"), gbc);

            gbc.gridx = 1;
            gbc.gridy = 0;
            gbc.anchor = GridBagConstraints.EAST;
            add(new JLabel("1"), gbc);
        }

    }

    public class OrderPricePane extends JPanel {

        public OrderPricePane() {
            setLayout(new GridBagLayout());
            GridBagConstraints gbc = new GridBagConstraints();
            gbc.gridx = 0;
            gbc.gridy = 0;
            gbc.weightx = 1;
            gbc.anchor = GridBagConstraints.WEST;
            add(new JLabel("Order price:"), gbc);

            gbc.gridx = 1;
            gbc.gridy = 0;
            gbc.anchor = GridBagConstraints.EAST;
            add(new JLabel("$558.9"), gbc);
        }

    }

}