![]() It offers you a vast range of training materials with 60 hours of applied learning, to help you excel in the field of Java development. ![]() If you want to become a software developer, then you can opt for Simplilearn’s Post Graduate Program in Full Stack Web Development. Java is a popular programming language worldwide. You can refer to our Java tutorial for beginners article for understanding more such concepts. With this article, you have explored the use of instanceof in Java. The below example shows the use of instanceof in Java for downcasting. Hence, it is always a good practice to use the Java instanceof operator to see if downcasting is valid or not. Although downcasting can also be done without an instanceof operator’s help, there is a considerable possibility of encountering compile-time or run-time errors. In simpler terms, it means typecasting a parent’s object to a child’s object. It is an act of using a subclass type to refer to a parent object. One of the primary applications of Java instanceof operator is downcasting. In the below example applies instanceof in Java to both scenarios. But if you use a parent reference referring to a child, it will return true. If you apply the instanceof operator to a parent object, you will get false. Scroll down and see what it returns.Īpplying Instanceof Operator with Different Parent-Child References In the code below, you will see the use of the instanceof operator with a null value variable. Applying Instanceof with a Variable that has a Null ValueĪpplying instanceof in Java with a variable that has a null value will return false. The example stated above shows the use of instanceof in Java and how it can check the instance regarding any object. Let’s see another example that includes a subclass, parent class, and object, and see how the instanceof works in Java. It will return true again when checked with the object because the latter is an ancestor of all classes in Java. This means that the object of the subclass is also an instance of the parent class. The demo refers to the child class’s object and checks if it is an instance of the parent class. This means that Car is the parent class and Mercedes is the child class. You answer is still very helpful,but I would like to see the question of whether downcast is sometimes the best way to go, even in the case where the result is modifiable. Please have a look at the below example that demonstrates it.Īs you can see in the example above, the class Mercedes extends the class Car. The question is whether it might make sense to downcast a collection. Since a subclass extends a parent class, the object reference in the subclass is also an instance of the parent class through inheritance. More Examples of Using the Instanceof Operator
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