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

In the second example, the arguments to the constructor are not a and b; they were changed to x and y, and this.x = x; means "assign this Point class instance's member variable x the value passed to the constructor as x".