shorttextfield.java

Java程序设计技巧与开发实例附书源代码。

import java.awt.*;

public class ShortTextField
    extends TextField
{
   private final static int MAX = 10;

   public String getShortText() throws LongStringException
   {
      if (getText().length() <= MAX)
      {
         return getText();
      }
      else
      {
         throw new LongStringException("String too long. Max: " + MAX);
      }
   }

}