Is the note for 'instanceof Operator' free to read?

Yes, NotesMedia provides free access to 'instanceof Operator' notes for BCA / B.Tech preparation online.

Does this cover the syllabus for Java Notes in English?

Yes, this chapter covers key concepts of 'instanceof Operator' under the Java Notes in English syllabus for BCA / B.Tech.

How long does it take to read 'instanceof Operator'?

This note is approximately a 9-minute read.

instanceof Operator - (BCA / B.Tech)

The `instanceof` Operator in Java:

The `instanceof` operator is a type-comparison operator used to test whether an object is an instance of a particular class, a subclass, or an interface. It returns a boolean value: `true` if the object is an instance of the specified type, and `false` otherwise.

Syntax: objectReference instanceof ClassOrInterfaceName;

Usage and Benefits:

The primary use of `instanceof` is for safe type casting. It helps prevent a `ClassCastException` that would occur at runtime if you tried to cast an object to an incompatible type. By checking the type before casting, you ensure the operation is valid.


Object obj = "Hello";
if (obj instanceof String) {
    String str = (String) obj; // Safe cast
    System.out.println(str.length());
}

If the object reference is `null`, the `instanceof` check will always return `false`.

instanceof Operator

The `instanceof` Operator in Java:

In this Chapter