- 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) { }

}