How to set max length to textfield?

I have a textfield. I want to set maxlength to this textfield. Example, length = 3.
Help me?

I succeeded. That link you sent very well. Thanks you. Then it's code:
JTextFieldLimit.java
import javax.swing.text.*;
//import com.sun.java.swing.*;
//import javax.swing.text.*;
public class JTextFieldLimit extends PlainDocument {
   private int limit;
   // optional uppercase conversion
   private boolean toUppercase = false;
   JTextFieldLimit(int limit)
    super();
    this.limit = limit;
   JTextFieldLimit(int limit, boolean upper) {
    super();
    this.limit = limit;
    toUppercase = upper;
   public void insertString
     (int offset, String str, AttributeSet attr)
       throws BadLocationException {
    if (str == null) return;
    if ((getLength() + str.length()) <= limit) {
      if (toUppercase) str = str.toUpperCase();
      super.insertString(offset, str, attr);
tswing.java
import java.awt.*;
import javax.swing.*;
//import javax.swing.*;
public class tswing extends JApplet{
    JTextField textfield1;
    JLabel label1;
    public void init() {
      getContentPane().setLayout(new FlowLayout());
      label1 = new JLabel("max 10 chars");
      textfield1 = new JTextField(15);
      getContentPane().add(label1);
      getContentPane().add(textfield1);
      textfield1.setDocument
         (new JTextFieldLimit(10));
TextField.html
<html>
<applet code=tswing width=500 height=500>
</applet>
</html>
By tungld_c0701m+

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Hi Rishit,
Thanks for your answer!
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Does it has some method to set Max Length on Field!

I want to set a maximun length on textfield and jtable cell to control the number of character on the field.
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aaaaalmost, quizmaster.
But your code doesnt check the result size.
If offs = 100 and maxlength = 100, it would
allow any String to be inserted.
Anyway...is a detail of course.
one other possibility, also improveable:
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} // CharacterLimitedDocument

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