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How does access modifiers work?
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Public: It is the highest visibility access modifier. It makes visible the class members (variables/methods) to any classes (child/non-child) present within same or any package.
Protected: It has lesser visibility than public access modifier. It makes visible the class members (variables/methods) to sub-classes within same or different package and it also make visible in any class of same package.
Default: It has lesser visibility than protected access modifier. It makes visible the class members (variables/methods) to any classes within same package only.
Private: It has least visibility than all access modifiers. It makes visible the class members (variables/methods) within same class only.
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