Answer:   There are the following uses of this keyword.
o this can be used to refer to the current class instance variable.
o this can be used to invoke current class method (implicitly)
o this() can be used to invoke the current class constructor.
o this can be passed as an argument in the method call.
o this can be passed as an argument in the constructor call.
o this can be used to return the current class instance from the method.