[تنبيه - عنوان غير مناسب : ]طلب ضرورى بالجافا

Java uses three explicit keywords to set the boundaries in a class: public,

private, and protected. Their use and meaning are quite

straightforward. These access specifiers determine who can use the

definitions that follow. public means the following element is available to

everyone. The private keyword, on the other hand, means that no one

can access that element except you, the creator of the type, inside

methods of that type. private is a brick wall between you and the client

programmer. If someone tries to access a private member, they’ll get a

compile-time error. protected acts like private, with the exception that

an inheriting class has access to protected members, but not private

members.

Java also has a “default” access, which comes into play if you don’t use

one of the aforementioned specifiers. This is usually called package

access because classes can access the members of other classes in the

same package, but outside of the package those same members appear to

be private.

Reference: Thinking in Java, Bruce Eckel, p75