Java IQ #22 - What are Instance Variables #javafullstackdevelopercourse #javainterviewquestions

In Java, instance variables are non-static fields that are declared inside a class but outside any method, constructor, or block. They are called instance variables because their values are unique to each instance of the class, meaning each object created from the class has its own copy of these variables.

Here are some key characteristics and uses of instance variables in Java:
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Scope: Instance variables are accessible throughout the class and can be used in any method, constructor, or block within the class.
Default Values: Instance variables have default values. For example, integers are initialized to 0, booleans to false, and object references to null if not explicitly initialized.
Access Modifiers: They can have access modifiers like private, protected, public, or default (no modifier). The access level determines where the variable can be accessed from outside the class.
Memory Allocation: Memory for instance variables is allocated when an object of the class is created, and they are destroyed when the object is destroyed.
Initialization: Instance variables can be initialized directly at the point of declaration or within constructors.

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