Boolean NOT Operations: applies to one boolean operand : Logical Operators « Operators « Java Tutorial

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public class MainClass {

  public static void main(String[] arg) {
    int a = 0;
    if (!(a == 0)) {
      System.out.println("a is not 0");
    } else {
      System.out.println("a is 0");
    }
  }

}

a is 0