How To limit the number of characters in JTextField?

Question

How to limit the number of characters entered in a JTextField?

Suppose I want to enter say 5 characters max. After that no characters can be entered into it.

Answer 1

http://www.rgagnon.com/javadetails/java-0198.html

import javax.swing.text.PlainDocument; import javax.swing.text.AttributeSet; import javax.swing.text.BadLocationException;  public class JTextFieldLimit extends PlainDocument {   private int limit;    JTextFieldLimit(int limit) {    super();    this.limit = limit;    }    public void insertString( int offset, String  str, AttributeSet attr ) throws BadLocationException {     if (str == null) return;      if ((getLength() + str.length()) <= limit) {       super.insertString(offset, str, attr);     }   } } 

Then

import java.awt.*; import javax.swing.*;   public class DemoJTextFieldWithLimit 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));      } } 

(first result from google)