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A Complete Guide to Java Programming

InstanceOf Operators

Explore how the instanceOf operator helps check if an object belongs to a specific class or interface. Understand bitwise operators like AND, OR, XOR, and Complement to manipulate data at the binary level in Java programming.

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These operators check whether an object is an instance of a class or a subclass. If a class implements an interface, that can also be checked.

Coding example: 53

Let us see the following example to understand how it works:

Java
/*
You can use the instanceof operator to test if an object is an instance of a class,
an instance of a subclass, or an instance of a class that implements a particular interface
*/
interface PlaceTheOrder{
    public void place();
}
class ParentClass implements PlaceTheOrder{
    public void place(){
        System.out.println("Placing the order.");
    }
}
class ChildClass extends ParentClass{
}
public class ExampleFiftyThree {
    public static void main(String[] args) {
        ParentClass parent = new ParentClass();
        ChildClass child = new ChildClass();
        /*
        The following two questions will have answers true
        */
        System.out.println("Is parent instance of ParentClass? : " + (parent instanceof ParentClass));
        System.out.println("Is parent instance of interface PlaceTheOrder? : " + (parent instanceof PlaceTheOrder));
        //it is false
        System.out.println("Is parent instance of ChildClass? : " + (parent instanceof ChildClass));
        /*
        The following answers will be true, because ChildClass is a subclass of ParentClass
        */
        System.out.println("Is child instance of ChildClass? : " + (child instanceof ChildClass));
        System.out.println("Is child instance of ParentClass? : " + (child instanceof ParentClass));
        System.out.println("Is child instance of interface PlaceTheOrder? : " + (child instanceof PlaceTheOrder));
    }
}

Code explanation

As you see in the above code, there are two classes and one interface. One is the parent class, and one is the child class. The parent class implements an interface. Check out the output to understand how it works.

Bitwise operators

When you design ...