"this" is a reference within instance methods and constructors to the object
itself. In the unique case that it appears as the first line of a constructor
with parentheses,

 public Foo()
 {
   this( null );
 }

it means invoke the other constructor that has the signature indicated in the
invocation.

"super" is a reference to a supertype's run-time dispatch to either an
instance or a constructor. Usually it is the reference to the superclass
instance, but in the special case that it appears as the first line of a
constructor with parentheses,

 public Foo()
 {
   super();
 }

it means invoke the superclass constructor that has the signature indicated in
the invocation.

Now go read a book. Do not expect help or advice or anything but a cold
shoulder if you are not willing to do even the slightest teeny eensy-weensy
microscopic quantum particle of effort on your own behalf.

- Lew