What is the difference between public, protected, package-private and private in Java?

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In Java, are there clear rules on when to use each of access modifiers, namely the default (package private), public, protected and private, while making class and interface and dealing with inheritance?

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The official tutorial may be of some use to you.

Class Package Subclass
(same pkg)		 Subclass
(diff pkg)		 World
public + + + + +
protected + + + +
no modifier + + +
private +

+ : accessible
blank : not accessible

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