The instanceof operator tests the class of an object at runtime. : instanceof Operator « Operators « SCJP

1. SCJP
2. Operators
3. instanceof Operator

//The left argument can be object reference, usually a variable or an array element.
//The right operand must be a class, interface, or array type. 


public class MainClass {
  public static void main(String[] argv) {
    MyClass myObject = new MyClass();

    if (myObject instanceof MyClass) {
      System.out.println("myobject is an instance of MyObject");
    }

  }
}

class MyClass {

}

class MyAnotherClass {
}

myobject is an instance of MyObject