Can someone explain to me in detail the use of 'this'?

Question

I don\'t really understand the use of \'this\' in Java. If someone could help me clarify I would really appreciate it.

On this website it says: http://docs.oracle.com/ja

Answer 1

It isn't this.x = a because there isn't an 'a' in the second example. The point is that you can reuse the same variable name, which is less confusing :-|