jTextField = new JTextField(); jTextField.setSize((int)0.8*width, (int)0.8*height);
jTextField.addKeyListener(new KeyAdapter() { public void keyTyped(KeyEvent e) { if(!Character.isLetter(e.getKeyChar())) { e.consume(); } } /** * Invoked when a key has been pressed. */ public void keyPressed(KeyEvent e) {
} /** * Invoked when a key has been released. */ public void keyReleased(KeyEvent e) {} });
* 測試JTextField只能輸入字母,包括中文字符\其他字符,
* 沒有檢測拷貝內容是否符合規則,可屏蔽粘貼快捷鍵或者同下處理粘貼
*/
import java.awt.Toolkit;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;import javax.swing.JFrame;
import javax.swing.JTextField;public class JTextFieldTest
{
private JFrame jFrame;
private JTextField jTextField;
private static final int width = 100;
private static final int height = 50;
public JTextFieldTest()
{
init();
}
private void init()
{
jFrame = new JFrame("JTextFieldTest");
jFrame.setSize(width,height);
jFrame.setResizable(false);
jFrame.setLocation(Toolkit.getDefaultToolkit().getScreenSize().width/2-jFrame.getWidth()/2,
Toolkit.getDefaultToolkit().getScreenSize().height/2-jFrame.getHeight()/2);
jTextField = new JTextField();
jTextField.setSize((int)0.8*width, (int)0.8*height);
jTextField.addKeyListener(new KeyAdapter()
{
public void keyTyped(KeyEvent e)
{
if(!Character.isLetter(e.getKeyChar()))
{
e.consume();
}
}
/**
* Invoked when a key has been pressed.
*/
public void keyPressed(KeyEvent e)
{
} /**
* Invoked when a key has been released.
*/
public void keyReleased(KeyEvent e) {}
});
jFrame.add(jTextField);
jFrame.setVisible(true);
jFrame.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
} );
}
public static void main(String[] args)
{
new JTextFieldTest();
}
}