Can anyone explain me access modifiers - 'protected' and 'default?

Question

Actually? I am having a little difficulty understanding 'protected' and 'default' access modifiers. Please help me understand it.

Answer 1

methods and fields which are protected can be used only by classes that extend the given class, that means
class Foo{protected int a=0;}
a can be used only in class which extends Foo (or extends something what extends Foo etc.)
class Another extends Foo{
//here can be variable a used
}

when you don't put any access modifier the methods and fields are visible within the package of the class