Answer Posted / sadhi

In java we have 4 specifiers i.e:
1.public
2.private
3.protected
4.default
public: we can access these instance variables and instance
methods at out side the class and inside the class.
2.private:using this specifier only we can access with in
the class. there is no possibility to access the outside.
3.protected:we can access the class with in the package.
4.default:Is generally act as public when we not specify
anything specifier.

so,we can use public class any where that mean these
variables and methods accessed by another class that's why
there is no need to create more public classes in single file

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