- limit textfield input to a maximum length
import java.awt.*;
import java.awt.event.*;

public class textfieldwithlimit extends textfield
    implements keylistener {
    private int  maxlength;
    public textfieldwithlimit
           (string initialstr,int col,int maxlength) {
      super(initialstr,col);
      this.maxlength = maxlength;
      addkeylistener(this);
      }
    public textfieldwithlimit (int col,int maxlength) {
      this("",col,maxlength);
      }
    public void keytyped(keyevent e) {
      char c = e.getkeychar();
      int len = gettext().length();
      if (len < maxlength) {
         return;
         }
      else {
         if((c==keyevent.vk_back_space)||
            (c==keyevent.vk_delete) ||
            (c==keyevent.vk_enter)||
            (c==keyevent.vk_tab)||
             e.isactionkey())
            return;
          else {
            e.consume();
           }
          }
      }
    public void keypressed(keyevent e) { }
    public void keyreleased(keyevent e) { }
    }

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