[Java] The role of the this keyword

Describe the role of the this keyword 

Within an instance method or a constructor, this is a reference to the current object — the object whose method or constructor is being called. You can refer to any member of the current object from within an instance method or a constructor by using this.

You can using this keyword with a field and also with the constructor.
The most common reason for using the this keyword is because a field is shadowed by a method or constructor parameter.
From within a constructor, you can also use the this keyword to call another constructor in the same class. Doing so is called an explicit constructor invocation.

Remarks
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Reference:
1) Introduction to Java Programming, Y. Daniel Liang
2) https://docs.oracle.com/javase/tutorial/java/javaOO/thiskey.html