How is 'this' reference in Java used?

The 'this' keyword in Java is a reference (which means it manages some relation) to the current object where it is called (can be constructor,function etc). It helps to keep the control of scope to access variables or any other elements. this keyword is very powerful and widely used in complex Java application.

Usage of 'this'

Here is given the 6 usage of java this keyword.

this can be used to refer current class instance variable.
this can be used to invoke current class method.
this() can be...