JTextField Max Length

    

import javax.swing.JTextField;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.PlainDocument;

public class JTextFieldMaxLength extends JTextField{

  public JTextFieldMaxLength(int length){
    this(null,length);
  }

  public JTextFieldMaxLength(String text, int length){
    super(new PlainDocumentMaxLength(length),text,length);
  }
}
class PlainDocumentMaxLength extends PlainDocument{
  private int maxLength;

  public PlainDocumentMaxLength(int maxLength) {
    this.maxLength = maxLength;
  }

  public void insertString (int offset, String str, AttributeSet a)
    throws BadLocationException { if (getLength() + str.length() > maxLength) { 
    // Toolkit.getDefaultToolkit().beep();
    }else{
    super.insertString(offset,str,a);
    }
  }
}

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JTextField Max Length : TextField « Swing JFC « Java

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