A quick question of Logical Operator - NOT?

Question

I know that the logical operator for NOT is " ! " sign.
But someone could please tell me how do I use the NOT operator in the below code.
if (c instanceof JLabel) Thanks

Answer 1

Before you use this, think long and hard if there's a better way to
achieve your goal than wandering through all of a panel's
components checking for those that aren't JLabels.
import javax.swing.*;
public class Not {
     public static void main(final String[] argv) {
          final JComponent panel = new JPanel();
          if (!(panel instanceof JLabel)) {
               System.out.println("It works.");
}