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Please clarify when to use public, default, protected, and private in Java.
I think these apply to members(variables and methods). They are used for access control.
public= all other classes can access the variables/members.
private= only that class can access the variables/members.
default and proected are related to packages.
only a class in the same package can access the members.
protected - if i remember correctly- acts like private within a package, except for subclasses.
For classes, you can only have public and non-public(default)
http://www.programmers99.com/2013/12/class-modifiers-in-java.html see this link you may get clear idea
Modifier | Class | Package | Subclass | World
public | ✔ | ✔ | ✔ | ✔
protected | ✔ | ✔ | ✔ | ✘
no modifier | ✔ | ✔ | ✘ | ✘
private | ✔ | ✘ | ✘ | ✘
The most strict level of access control allowed in Java is private. Any member variable or method marked as private will be only accessible in that class. But we might not need such a strong restriction all the time. So Java supports the other levels like default (no-modifier), protected, and public. Please note that while private, protected and public are keywords, the default access level is NOT a keyword. If we do not place either private, protected or public before a member variable or method, then it is automatically considered as default access level. For more details and practice programs please follow the link http://java.meritcampus.com/t/131/Other-levels-of-access-control