用java写一个类判断text只能输入0-9的数字

 

 

 

import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;

public class DigitalTextListener implements Listener
{

 public void handleEvent(Event event)
 {
  String input = event.text;//get input text content
  char[] chars = new char[input.length()];//tran into single char
  input.getChars(0, chars.length, chars, 0);
  for (int i = 0; i < chars.length; i++)
  {
   if (!('0' <= chars[i] && chars[i] <= '9'))
   {
    event.doit = false;//if not 0-9 ,retrun false;
    return;
   }
  }

 }

}