Problem with "this" in constructor

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Java8

error getting

class.java:5: error: cannot find symbol
		this.s = g;

class.java:6: error: cannot find symbol
		this.f = d;

i mean it weirdly it declaration is in there in class ?? right ?

What I have tried:

class Add{
// private int s;
// private int f;
public int a(int g,int d){
this.s = g;
this.f = d;
return g+d;
}
public void main(String[] args) {
Add d = new Add();
System.out.print(d.a(4,5));
}



}