Private means this could only be seen within this class.
Protected means "package private", this could be seen by subclasses and package members.
| Class | Package | Subclass | Subclass | World
| | |(same pkg)|(diff pkg)|
————————————+———————+—————————+——————————+——————————+————————
public | + | + | + | + | +
————————————+———————+—————————+——————————+——————————+————————
protected | + | + | + | + | o
————————————+———————+—————————+——————————+——————————+————————
no modifier | + | + | + | o | o
————————————+———————+—————————+——————————+——————————+————————
private | + | o | o | o | o
+ : accessible
o : not accessible