Sometimes it is useful to have a text field, for which you can specify a max number of characters. The following class give you just that:

 import java.awt.*; import java.awt.event.*; public class LimitedLength_TextField extends TextField implements KeyListener { private int maxLength; public LimitedLength_TextField (String str,int cols,int maxLength) { super(str,cols); this.maxLength = maxLength; addKeyListener(this); } public LimitedLength_TextField (int cols,int maxLength) { this("",cols,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) { } }