this Keyword

 There can be a lot of usage of Java this keyword. In Java, this is a reference variable that refers to the current object.

Usage of Java this keyword

• this can be used to refer current class instance variable.
• this can be used to invoke current class method (implicitly)
• this() can be used to invoke current class constructor.
• this can be passed as an argument in the method call.
• this can be passed as argument in the constructor call.
• this can be used to return the current class instance from the method.

 this: to refer current class instance variable

usage of this() constructor call

Notes:Call to this() must be the first statement in constructor.