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我想讓用戶在CardLayout上的一個面板中輸入名稱,然後在下一個面板中定義JLabels文本。我使用System.out.println(userName);要仔細檢查它是否正在拾取文本,它肯定是,但我不知道如何讓'用戶'文本是JTextFields輸入的文本。如何將標籤文本設置爲JTextField輸入
低於全部工作代碼:
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();
}
}
感謝
這是一個直線上升的修復,非常感謝你。你介意解釋爲什麼它不能在ActionListener之外工作嗎?謝謝 – SkyPlus
這是一個因果關係:你創建了一個「gameDataPanel」類的實例,窗口顯示出來,它的構造函數被執行。此外,您的事件偵聽器已註冊但尚未執行。用戶名字段仍爲空。用戶輸入一些數據,按下按鈕,現在執行事件監聽器代碼,並從文本字段中讀取用戶名。 –