Keyword this is a reference variable in Java that refers to the current object.
The various usages of 'THIS' keyword in Java are as follows:

  • It can be used to refer instance variable of current class
  • It can be used to invoke or initiate current class constructor
  • It can be passed as an argument in the method call
  • It can be passed as argument in the constructor call
  • It can be used to return the current class instance

Sometimes a method will need to refer to the object that invoked it. To allow this, Java defines this keyword. this can be used inside any method to refer to the current object. That is, this is always a reference to the object on which the method was invoked. You can use this anywhere a reference to an object of the current class type is permitted.