如何将标签文本设置为 JTextField 输入

Question

我试图让用户在 CardLayout 上的一个面板中输入一个名称，然后在它切换到的下一个面板中定义一个 JLabels 文本。我用 System.out.println(userName);仔细检查它是否正在拾取文本，它肯定是，但我不知道如何让“用户”文本成为 JTextFields 输入的文本。

完整的工作代码如下：

import java.awt.CardLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class gameDataPanel {

    private JFrame frame = new JFrame("Game Data Input");
    private JPanel mainPanel, loginPanel, gameDataPanel;
    private JLabel playerName, user;
    private JTextField playerNameInput;
    private JButton submit;
    private CardLayout gameDataLayout = new CardLayout();
    private String userName;

    public gameDataPanel() {

        mainPanel = new JPanel();

        mainPanel.setLayout(gameDataLayout);

        playerName = new JLabel("Enter Player Name: ");
        playerNameInput = new JTextField(30);
        submit = new JButton("Submit");

        loginPanel = new JPanel();
        loginPanel.add(playerName);
        loginPanel.add(playerNameInput);
        loginPanel.add(submit);

        gameDataPanel = new JPanel();
        user = new JLabel();
        user.setText(userName);
        gameDataPanel.add(user);

        mainPanel.add(loginPanel, "1");
        mainPanel.add(gameDataPanel, "2");
        gameDataLayout.show(mainPanel, "1");

        submit.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent event) {
                userName = playerNameInput.getText();
                gameDataLayout.show(mainPanel, "2");
                System.out.println(userName);
            }
        });

        playerNameInput.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent event) {

                userName = playerNameInput.getText();
                gameDataLayout.show(mainPanel, "2");
                System.out.println(userName);
            }
        });

        frame.add(mainPanel);
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
    }

    public static void main(String[] args) {
        gameDataPanel gd = new gameDataPanel();
    }

}

谢谢

Answer 1

我不是 100% 确定，我是否理解正确：您想显示在​​“playerNameInput”中输入的用户名以显示在 JLabel“用户”中？在这种情况下，您必须在用户输入内容并按下按钮后更新事件侦听器中的 JLabel 对象。试试这样的：

playerNameInput.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent event) {

        userName = playerNameInput.getText();
        user.setText(userName);
        gameDataLayout.show(mainPanel, "2");
        System.out.println(userName);
    }
});

我希望这会有所帮助:-)