How to use

IntegerDocument

in

org.jfree.ui

 public static class IntegerField extends JTextField {
  public IntegerField(String txt) {
    super(txt);
    setDocument(new IntegerDocument());
  }

  public int getInt() {
    return this.getText().equals("") ? 0 : Integer.parseInt(this.getText());        
  }
}

/**
 * Inserts a string.
 *
 * @param i  i.
 * @param s  s.
 * @param attributes  the attributes.
 *
 * @throws BadLocationException ??
 */
public void insertString(final int i, final String s, final AttributeSet attributes)
  throws BadLocationException {
  super.insertString(i, s, attributes);
  if (s != null && (!s.equals("-") || i != 0 || s.length() >= 2)) {
    try {
      Integer.parseInt(getText(0, getLength()));
    }
    catch (NumberFormatException e) {
      remove(i, s.length());
    }
  }
}

/**
 * Inserts a string.
 *
 * @param i  i.
 * @param s  s.
 * @param attributes  the attributes.
 *
 * @throws BadLocationException ??
 */
public void insertString(final int i, final String s, final AttributeSet attributes)
  throws BadLocationException {
  super.insertString(i, s, attributes);
  if (s != null && (!s.equals("-") || i != 0 || s.length() >= 2)) {
    try {
      Integer.parseInt(getText(0, getLength()));
    }
    catch (NumberFormatException e) {
      remove(i, s.length());
    }
  }
}

current = (current == null) ? new Insets(0, 0, 0, 0) : current;
this.topValueEditor = new JTextField(new IntegerDocument(), "" 
    + current.top, 0);
this.leftValueEditor = new JTextField(new IntegerDocument(), "" 
    + current.left, 0);
this.bottomValueEditor = new JTextField(new IntegerDocument(), "" 
    + current.bottom, 0);
this.rightValueEditor = new JTextField(new IntegerDocument(), "" 
    + current.right, 0);

/**
 * Inserts a string.
 *
 * @param i  i.
 * @param s  s.
 * @param attributes  the attributes.
 *
 * @throws BadLocationException ??
 */
public void insertString(final int i, final String s, final AttributeSet attributes)
  throws BadLocationException {
  super.insertString(i, s, attributes);
  if (s != null && (!s.equals("-") || i != 0 || s.length() >= 2)) {
    try {
      Integer.parseInt(getText(0, getLength()));
    }
    catch (NumberFormatException e) {
      remove(i, s.length());
    }
  }
}

current = (current == null) ? new Insets(0, 0, 0, 0) : current;
this.topValueEditor = new JTextField(new IntegerDocument(), ""
    + current.top, 0);
this.leftValueEditor = new JTextField(new IntegerDocument(), ""
    + current.left, 0);
this.bottomValueEditor = new JTextField(new IntegerDocument(), ""
    + current.bottom, 0);
this.rightValueEditor = new JTextField(new IntegerDocument(), ""
    + current.right, 0);

current = (current == null) ? new Insets(0, 0, 0, 0) : current;
this.topValueEditor = new JTextField(new IntegerDocument(), ""
    + current.top, 0);
this.leftValueEditor = new JTextField(new IntegerDocument(), ""
    + current.left, 0);
this.bottomValueEditor = new JTextField(new IntegerDocument(), ""
    + current.bottom, 0);
this.rightValueEditor = new JTextField(new IntegerDocument(), ""
    + current.right, 0);