JTextField Number Input

Hello.
How do you limit the number of characters in a JTextField.
For example: JTextField first_box_serial=new JTextField(4);
Will still allow the user to inter as many characters in the field.
I want the user to only be able to enter 4 characters and thats it!!
Thank You in advance!!

Use this:
public class LimitedLengthDocument extends javax.swing.text.PlainDocument {
     int maxLength;
     public LimitedLengthDocument(int maxLength) {
          super();
          this.maxLength = maxLength;
     public void insertString(int offset, String str, AttributeSet a)
          if(getLength() < maxLength)
              super.insertString(offset,str,a);
}Use setDocument(new LimitedLengthDocument(4)); on your JTextField. You'll only be able to type in 4 characters. To only allow numbers you can just modify insertString to check that str is numbers.
Jeff

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flounder wrote:
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