Web Reference: Jul 23, 2025 · In Java, instanceof is a keyword used for checking if a reference variable contains a given type of object reference or not. Following is a Java program to show different behaviors of instanceof. instanceof is a binary operator we use to test if an object is of a given type. The result of the operation is either true or false. It’s also known as a type comparison operator because it compares the instance with the type. Before casting an unknown object, the instanceof check should always be used. Doing this helps to avoid a ClassCastExceptio... The java instanceof operator is used to test whether the object is an instance of the specified type (class or subclass or interface). The instanceof in java is also known as type comparison operator as it compares the instance with type.
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