Access modifier (access modifier)

Access modifier (access modifier)

1) Public: the properties and methods that are modified by publicly can be accessed by all classes

2) protected (Protected): properties and methods that are modified by protected can be accessed within the class, the same package, and the subclasses of the class.

3) Private (private): properties and methods that are modified by private can only be used inside that class.

4) Default (without any access modifiers): Used inside the class and in classes under the same package.

Instanceof: Determines whether an object is an instance of a class.

Form: Reference name instanceof class name (interface name), returns a Boolean value

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Access modifier (access modifier)