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

Like ktm mentioned, setters tend to use the same name as the field for the parameter. In this case, the parameter shadows the field name, so

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

would just set the parameter to itself rather than setting the field to the parameter.