this
is a reference to the object typed as the current class, and super
is a reference to the object typed as its parent class.
In the constructor, this()
calls a constructor defined in the current class. super()
calls a constructor defined in the parent class. The constructor may be defined in any parent class, but it will refer to the one overridden closest to the current class. Calls to other constructors in this way may only be done as the first line in a constructor.
Calling methods works the same way. Calling this.method()
calls a method defined in the current class where super.method()
will call the same method as defined in the parent class.