Java how does instanceof work

Let's see the example given below where we apply instanceof operator with the variable that have null value. When Subclass type refers to the object of Parent class, it is known as downcasting. If we perform it directly, compiler gives Compilation error. If you perform it by typecasting, ClassCastException is thrown at runtime. But if we use instanceof operator, downcasting is possible.

Downcasting can also be performed without the use of instanceof operator as displayed in the following example:. Let's take closer look at this, actual object that is referred by a, is an object of Dog class. So if we downcast it, it is fine. But what will happen if we write:. JavaTpoint offers too many high quality services. Mail us on [email protected] , to get more information about given services.

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Read guide. JavaScript: Check if array is empty 11 min read You might find this useful when you want to execute a particular script if the array is empty - like enabling or disabling buttons based on if there is any input in the required field, etc. And then there is polymorphism which can be used to make the code better. Capabilities Brief Contact Us. Joey on June 24, at pm. Alex on July 8, at am.

James Bailey on November 23, at pm. Pablo Pazos on October 12, at am. Java is case sensitive, it is not instanceOf is instanceof Reply. The title has been corrected. Submit a Comment Cancel reply Your email address will not be published.

We use cookies to ensure that we give you the best experience on our website. If you continue to use this site we will assume that you are happy with it. The following example shows the behavior of instanceof with String objects.

The following example shows the behavior of instanceof with Date objects. The following example shows the behavior of instanceof with objects created using Object. The following code creates an object type Car and an instance of that object type, mycar. The instanceof operator demonstrates that the mycar object is of type Car and of type Object.