JTextField-Java swing-没有光标？

Question

Hey guys, see this snipped of code:

JFrame loginFrame = new JFrame("Login");

  loginFrame.setSize(500,400);
  JPanel loginPanel = new JPanel();
  loginPanel.setLayout(new GridLayout(0,2));

  JLabel header = new JLabel("Login");
  JLabel header2 = new JLabel("blahvlah");
  JLabel loginLabel = new JLabel("Login");
  JTextField loginField = new JTextField(24);
  JLabel passLabel = new JLabel("Password");
  JTextField passField = new JTextField(24);

  loginPanel.add(header);
  loginPanel.add(header2);
  loginPanel.add(loginLabel);
  loginPanel.add(loginField);
  loginPanel.add(passLabel);
  loginPanel.add(passField);

  loginFrame.add(loginPanel);
  loginFrame.setVisible(true);
loginframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

the JTextFields are present on the app, but i cannot enter anything into them? There is no cursor either, what is the problem? Also my exit on close does not seem to work?

thanks

Answer 1

The code you posted does not compile (on the last line you typed loginframe instead of loginFrame ). Having fixed that, the following program:

public class JFrameTest {
    public static void main(String[] args) {
        JFrame loginFrame = new JFrame("Login");

        loginFrame.setSize(500,400);
        JPanel loginPanel = new JPanel();
        loginPanel.setLayout(new GridLayout(0,2));

        JLabel header = new JLabel("Login");
        JLabel header2 = new JLabel("blahvlah");
        JLabel loginLabel = new JLabel("Login");
        JTextField loginField = new JTextField(24);
        JLabel passLabel = new JLabel("Password");
        JTextField passField = new JTextField(24);

        loginPanel.add(header);
        loginPanel.add(header2);
        loginPanel.add(loginLabel);
        loginPanel.add(loginField);
        loginPanel.add(passLabel);
        loginPanel.add(passField);

        loginFrame.add(loginPanel);
        loginFrame.setVisible(true);
        loginFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}

runs just fine. I can enter text in both JTextFields and can also close the JFrame: