Java - when “this” is the only way to go?

Question

The following code runs for both var = putVar; & this.var = putVar;

I understand: \"this\" is used to identify that - \"put this value for just \'my\'

Answer 1

Because people like to use the same variable name for both the method parameter and the instance variable - in which case you need this to differentiate.

public void setX(int x) {
    this.x = x;
}