Java JPanel 和 JLabel

Question

我正在尝试创建 2 组 JLabels，一组包含名称，第二组包含值。从数据库中提取值并显示到第二组 JLabel。

我似乎无法排列 2 组 JLabel，以便带有名称的集合位于面板的左侧，带有值的集合将直接位于面板的右侧。我知道我的网格布局有一个因素，我只是不知道它应该是什么。

package Frames;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.border.TitledBorder;

import Application.Main;

public class AccountFrame extends JPanel implements PropertyChangeListener, ActionListener {

    private static JFrame accountFrame;

    private JLabel firstNameLabel;
    private JLabel lastNameLabel;
    private JLabel dobLabel;
    private JLabel emailLabel;
    private JLabel usernameLabel;
    private JLabel passwordLabel;

    private static String firstNameLabelText = "First Name: ";
    private static String lastNameLabelText = "Last Name: ";
    private static String dobLabelText = "Date Of Birth: ";
    private static String emailLabelText = "Email: ";
    private static String usernameLabelText = "Username: ";
    private static String passwordLabelText = "Password: ";

    private static JButton editButton;
    private static JButton closeButton;

    public AccountFrame() {
        super(new BorderLayout());

        firstNameLabel = new JLabel(firstNameLabelText);
        firstNameLabel.setForeground(Color.WHITE);
        firstNameLabel.setFont(new Font("Andalus", Font.BOLD, 18));

        lastNameLabel = new JLabel(lastNameLabelText);
        lastNameLabel.setForeground(Color.WHITE);
        lastNameLabel.setFont(new Font("Andalus", Font.BOLD, 18));

        dobLabel = new JLabel(dobLabelText);
        dobLabel.setForeground(Color.WHITE);
        dobLabel.setFont(new Font("Andalus", Font.BOLD, 18));

        emailLabel = new JLabel(emailLabelText);
        emailLabel.setForeground(Color.WHITE);
        emailLabel.setFont(new Font("Andalus", Font.BOLD, 18));

        usernameLabel = new JLabel(usernameLabelText);
        usernameLabel.setForeground(Color.WHITE);
        usernameLabel.setFont(new Font("Andalus", Font.BOLD, 18));

        passwordLabel = new JLabel(passwordLabelText);
        passwordLabel.setForeground(Color.WHITE);
        passwordLabel.setFont(new Font("Andalus", Font.BOLD, 18));

        editButton = new JButton("Edit");
        editButton.setBackground(new Color(129,13,13));
        editButton.setForeground(Color.WHITE);
        editButton.setFocusPainted(false);
        editButton.setFont(new Font("Andalus", Font.BOLD, 18));
        editButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
//EDIT ACCOUNT INFORMATION.
            }
        });

        closeButton = new JButton("Close");
        closeButton.setBackground(new Color(129,13,13));
        closeButton.setForeground(Color.WHITE);
        closeButton.setFocusPainted(false);
        closeButton.setFont(new Font("Andalus", Font.BOLD, 18));
        closeButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                accountFrame.dispose();
            }
        });

        TitledBorder accountPanelBorder = BorderFactory.createTitledBorder(BorderFactory.createLineBorder(Color.WHITE), "Account", TitledBorder.CENTER , TitledBorder.TOP, new Font("Andalus", Font.BOLD, 18));
        accountPanelBorder.setTitleColor(Color.WHITE);

        //this is where the labels need to have values 
        //added on to the string to get values from the current character.
        JPanel accountPanel = new JPanel(new GridLayout(0, 1));
        accountPanel.add(firstNameLabel, BorderLayout.WEST);
        accountPanel.add(lastNameLabel, BorderLayout.WEST);
        accountPanel.add(dobLabel, BorderLayout.WEST);
        accountPanel.add(emailLabel, BorderLayout.WEST);
        accountPanel.add(usernameLabel, BorderLayout.WEST);
        accountPanel.add(passwordLabel, BorderLayout.WEST);
        accountPanel.setBackground(new Color(82,80,80));
        accountPanel.setBorder(accountPanelBorder);
        accountPanel.setPreferredSize(new Dimension(400,200));

//      JPanel accountValuesPanel = new JPanel(new GridLayout(0, 1));
//      accountValuesPanel.add(firstNameValue);
//      accountValuesPanel.setBackground(new Color(82,80,80));

        JPanel buttons = new JPanel(new FlowLayout(FlowLayout.CENTER));
        buttons.add(editButton);
        buttons.add(closeButton);
        buttons.setBackground(new Color(82,80,80));

        setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));
        setBackground(new Color(82,80,80));
        add(accountPanel, BorderLayout.WEST);
        add(buttons, BorderLayout.SOUTH);
//      add(accountValuesPanel, BorderLayout.LINE_END);
    }

    /**
     * Create the GUI and show it. For thread safety,
     * this method should be invoked from the 
     * event dispatch thread.
     */
    public static void createAndShowGUI() {
        accountFrame = new JFrame("OVERRATED");
        accountFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        accountFrame.setBackground(Color.red);
        accountFrame.add(new AccountFrame());
        accountFrame.setVisible(true);
        accountFrame.pack();
        accountFrame.setLocationRelativeTo(null);   
        accountFrame.setTitle("OVERRATED");
        accountFrame.setResizable(false);
        //startupFrame.setIconImage(new ImageIcon().getImage());
        JFrame.setDefaultLookAndFeelDecorated(false);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        // TODO Auto-generated method stub

    }

    @Override
    public void propertyChange(PropertyChangeEvent evt) {
        // TODO Auto-generated method stub

    }

    public static void main(String[] args) {
        AccountFrame a = new AccountFrame();
        a.createAndShowGUI();
    }
}

Answer 1

首先，尽管你的accountPanel布局是gridLayout，但你用的却是BorderLayout:

JPanel accountPanel = new JPanel(new GridLayout(0, 1));
accountPanel.add(firstNameLabel, BorderLayout.WEST); // BorderLayout.WEST wrong

我的建议，你应该使用 gridbaglayout 。 GridbagLayout 可能看起来很难学，但实际上很有逻辑。

我稍微改变了你的代码。

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import javax.swing.border.TitledBorder;

@SuppressWarnings("serial")
public class AccountFrame extends JPanel implements PropertyChangeListener,
        ActionListener {
    private static JFrame accountFrame;
    private JTextField firstNameTextField, lastNameTextField, dobTextField,
            emailTextField, userNameTextField;
    private JPasswordField passwordPasswordField;

    private JLabel firstNameLabel;
    private JLabel lastNameLabel;
    private JLabel dobLabel;
    private JLabel emailLabel;
    private JLabel usernameLabel;
    private JLabel passwordLabel;

    private static String firstNameLabelText = "First Name: ";
    private static String lastNameLabelText = "Last Name: ";
    private static String dobLabelText = "Date Of Birth: ";
    private static String emailLabelText = "Email: ";
    private static String usernameLabelText = "Username: ";
    private static String passwordLabelText = "Password: ";

    private static JButton editButton;
    private static JButton closeButton;

    public AccountFrame() {
        super(new BorderLayout());

        firstNameLabel = new JLabel(firstNameLabelText);
        firstNameLabel.setForeground(Color.WHITE);
        firstNameLabel.setFont(new Font("Andalus", Font.BOLD, 18));

        lastNameLabel = new JLabel(lastNameLabelText);
        lastNameLabel.setForeground(Color.WHITE);
        lastNameLabel.setFont(new Font("Andalus", Font.BOLD, 18));

        dobLabel = new JLabel(dobLabelText);
        dobLabel.setForeground(Color.WHITE);
        dobLabel.setFont(new Font("Andalus", Font.BOLD, 18));

        emailLabel = new JLabel(emailLabelText);
        emailLabel.setForeground(Color.WHITE);
        emailLabel.setFont(new Font("Andalus", Font.BOLD, 18));

        usernameLabel = new JLabel(usernameLabelText);
        usernameLabel.setForeground(Color.WHITE);
        usernameLabel.setFont(new Font("Andalus", Font.BOLD, 18));

        passwordLabel = new JLabel(passwordLabelText);
        passwordLabel.setForeground(Color.WHITE);
        passwordLabel.setFont(new Font("Andalus", Font.BOLD, 18));

        // lets create JTextFields and a JPasswordField
        firstNameTextField = new JTextField(20);
        lastNameTextField = new JTextField(20);
        dobTextField = new JTextField(20);
        emailTextField = new JTextField(20);
        userNameTextField = new JTextField(20);
        passwordPasswordField = new JPasswordField(20);

        editButton = new JButton("Edit");
        editButton.setBackground(new Color(129, 13, 13));
        editButton.setForeground(Color.WHITE);
        editButton.setFocusPainted(false);
        editButton.setFont(new Font("Andalus", Font.BOLD, 18));
        editButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                // EDIT ACCOUNT INFORMATION.
            }
        });

        closeButton = new JButton("Close");
        closeButton.setBackground(new Color(129, 13, 13));
        closeButton.setForeground(Color.WHITE);
        closeButton.setFocusPainted(false);
        closeButton.setFont(new Font("Andalus", Font.BOLD, 18));
        closeButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                accountFrame.dispose();
            }
        });

        TitledBorder accountPanelBorder = BorderFactory.createTitledBorder(
                BorderFactory.createLineBorder(Color.WHITE), "Account",
                TitledBorder.CENTER, TitledBorder.TOP, new Font("Andalus",
                        Font.BOLD, 18));
        accountPanelBorder.setTitleColor(Color.WHITE);

        // this is where the labels need to have values
        // added on to the string to get values from the current character.
        JPanel accountPanel = new JPanel(new GridBagLayout());
        accountPanel.setBackground(new Color(82, 80, 80));
        accountPanel.setBorder(accountPanelBorder);
        accountPanel.setPreferredSize(new Dimension(400, 200));

        GridBagConstraints gbc = new GridBagConstraints();
        gbc.anchor = GridBagConstraints.CENTER;
        gbc.fill = GridBagConstraints.BOTH;
        gbc.insets = new Insets(0, 0, 0, 0);

        // lets add labels and textfields

        // 1. row
        gbc.gridx = 0;
        gbc.gridy = 0;
        gbc.gridwidth = 1;
        gbc.gridheight = 1;
        accountPanel.add(firstNameLabel, gbc);

        gbc.gridx = 1;
        gbc.gridwidth = 2;
        accountPanel.add(firstNameTextField, gbc);

        // 2. row
        gbc.gridx = 0;
        gbc.gridy = 1;
        gbc.gridwidth = 1;
        gbc.gridheight = 1;
        accountPanel.add(lastNameLabel, gbc);

        gbc.gridx = 1;
        gbc.gridwidth = 2;
        accountPanel.add(lastNameTextField, gbc);

        // 3. row
        gbc.gridx = 0;
        gbc.gridy = 2;
        gbc.gridwidth = 1;
        gbc.gridheight = 1;
        accountPanel.add(dobLabel, gbc);

        gbc.gridx = 1;
        gbc.gridwidth = 2;
        accountPanel.add(dobTextField, gbc);

        // 4. row
        gbc.gridx = 0;
        gbc.gridy = 3;
        gbc.gridwidth = 1;
        gbc.gridheight = 1;
        accountPanel.add(emailLabel, gbc);

        gbc.gridx = 1;
        gbc.gridwidth = 2;
        accountPanel.add(emailTextField, gbc);

        // 5. row
        gbc.gridx = 0;
        gbc.gridy = 4;
        gbc.gridwidth = 1;
        gbc.gridheight = 1;
        accountPanel.add(usernameLabel, gbc);

        gbc.gridx = 1;
        gbc.gridwidth = 2;
        accountPanel.add(userNameTextField, gbc);

        // 6. row
        gbc.gridx = 0;
        gbc.gridy = 5;
        gbc.gridwidth = 1;
        gbc.gridheight = 1;
        accountPanel.add(passwordLabel, gbc);

        gbc.gridx = 1;
        gbc.gridwidth = 2;
        accountPanel.add(passwordPasswordField, gbc);

        JPanel buttons = new JPanel(new FlowLayout(FlowLayout.CENTER));
        buttons.add(editButton);
        buttons.add(closeButton);
        buttons.setBackground(new Color(82, 80, 80));

        setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));
        setBackground(new Color(82, 80, 80));
        add(accountPanel, BorderLayout.WEST);
        add(buttons, BorderLayout.SOUTH);
        // add(accountValuesPanel, BorderLayout.LINE_END);
    }

    /**
     * Create the GUI and show it. For thread safety, this method should be
     * invoked from the event dispatch thread.
     */
    public static void createAndShowGUI() {
        accountFrame = new JFrame("OVERRATED");
        accountFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        accountFrame.setBackground(Color.red);
        accountFrame.add(new AccountFrame());

        accountFrame.pack();
        accountFrame.setTitle("OVERRATED");
        accountFrame.setResizable(false);
        accountFrame.setVisible(true);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        // TODO Auto-generated method stub

    }

    @Override
    public void propertyChange(PropertyChangeEvent evt) {
        // TODO Auto-generated method stub

    }

    public static void main(String[] args) {
        AccountFrame a = new AccountFrame();
        a.createAndShowGUI();
    }
}