Question

我正在制作一个命令行程序, 我需要测试是否按下输入键。

Answer 1

如果输入键被按在 < a href=> http://docs.oracle.com/javase/7/docs/api/javax/swing/JText Field.html"\code > JTextField 中,而 JTextField 中 ActionListener 中,则启动 ActionEvent 。

JTextField field = ...
field.addActionListener(new ActionListener() {
    @Override
    public void actionPerformed(ActionEvent e) {
        System.out.println("Enter key pressed");
    }
});

Answer 2

在文本字段中添加一个密钥听众, 并在密钥 Presred () 中检查 KeyEvent S KeyCode。尝试下面的例子 :

public class TestEnterKeyPressInJTextField
{
  public static void main(String[] args)
  {
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    JTextField textField = new JTextField(20);
    textField.addKeyListener(new KeyAdapter()
    {
      public void keyPressed(KeyEvent e)
      {
        if (e.getKeyCode() == KeyEvent.VK_ENTER)
        {
          System.out.println("ENTER key pressed");
        }
      }
    });

    frame.getContentPane().add(textField);
    frame.pack();
    frame.setVisible(true);
  }
}

Answer 3

命令行程序还是 gui 应用程序?

查找 < a href=" "https://stackoverflow.com/ questions/1457071/how-how- to-know- when-a-user- has-re-re-re-re-re-re-re-re-re-re-a-key-in-java" > 详细回答

public void keyTyped(KeyEvent e) {
}

public void keyPressed(KeyEvent e) {
    System.out.println("KeyPressed: "+e.getKeyCode()+", ts="+e.getWhen());
}

public void keyReleased(KeyEvent e) {
    System.out.println("KeyReleased: "+e.getKeyCode()+", ts="+e.getWhen());
}

按您想要的每个按键并查看“密钥代码”

友情链接