如何让文本框只对数字和退格有效?

[dylsz]

我的程序如下:
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
//只能接受数字
public class NumericTextField extends JTextField {

public NumericTextField(){
super();
enableEvents(AWTEvent.KEY_EVENT_MASK);
}

public NumericTextField(int len){
super(len);
enableEvents(AWTEvent.KEY_EVENT_MASK);
}

protected void processKeyEvent(KeyEvent e){
char ch = e.getKeyChar();
if(Character.isDigit(ch) || e.getKeyCode() == KeyEvent.VK_BACK_SPACE){
super.processKeyEvent(e);
}else{
e.consume();
}
}
}
但是对退格无效,请问得怎么修改?
谢谢.

[dylsz]

各位高手帮帮我,谢谢了....

[shine333]

建议今后对所有的KeyEvent都采用getKeyCode();判断按键，而非使用getKeyChar();即使是对数字，具体按键的值请参阅KeyEvent.VK_XXX

int code = e.getKeyCode();
if (code == KeyEvent.VK_BACK_SPACE)

[shine333]

另外还需要将<-键从textField的快捷方式中注销掉，具体方法忘了，帮你回忆一下

[dylsz]

if(Character.isDigit(ch) || e.getKeyCode() == KeyEvent.VK_BACK_SPACE){
=>
if(Character.isDigit(ch) || (int)ch == KeyEvent.VK_BACK_SPACE){

3q.

[wilddonkey]

帮你up一下