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

If some variable/argument with same name as object's property is defined, it "overlaps" the name of that property and one should use this.var_name.

So yes, it could be written as this.x = a, but is somewhat redundant.