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我想让用户在CardLayout上的一个面板中输入名称,然后在下一个面板中定义JLabels文本。我使用System.out.println(userName);要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'文本是JTextFields输入的文本。如何将标签文本设置为JTextField输入
低于全部工作代码:
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();
}
}
感谢
这是一个直线上升的修复,非常感谢你。你介意解释为什么它不能在ActionListener之外工作吗?谢谢 – SkyPlus
这是一个因果关系:你创建了一个“gameDataPanel”类的实例,窗口显示出来,它的构造函数被执行。此外,您的事件侦听器已注册但尚未执行。用户名字段仍为空。用户输入一些数据,按下按钮,现在执行事件监听器代码,并从文本字段中读取用户名。 –