What is the difference between public, protected, package-private and private in Java?(Java 中的 public、protected、package-private 和 private 有什么区别?)

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问题描述

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?

解决方案

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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