this is used to resolve the naming collision between class 
scope var. and method scpoe var.
super is used to the resolve the naming collision between 
superclass member and subclass member.

this() is used to invoke present class constructor.Super()
is used to invoke super class Constructor.

Mainly  this() is used to avoid hidding the field varaibles 
by the varaibles of the methods which are having same name..

super() is used to invoke the super class from sub class...

this keyword is used to refer the current instance of the
particular class where as super keyword is used to refer the
superclass members.

'this' and super are two keywords in java.
'this' doesn't support inheritance bt 'super' supports 
inheritance.
this keyword is used in two cases
1.to differentiate betn instance and local variables.
2.calling of one constructor from another constructor.
Restriction:this keyword should be written in lowercase &
must used in firstline.more than one 'this' keyword is  not 
used in one block. 
super is used 4 three reason.
1.differentiates betn superclass variable & child class 
variables.
2.calling of superclass constructor in childclass 
constructor.
3.it  is also used in calling of superclass override method
in child class.
restriction:
it must be in 1stline.
must be in lowercase.

this() keyword is use to invoke the current class.
while super() keyword is use to invoke super class.