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Tip of the Day
Language: Java
Expertise: Intermediate
Jan 6, 2000

Textfield With Limited Length Of Characters

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) { } 
} 
Behrouz Fallahi
 
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