//abstract and make private
package p;
class A{
private int f;
void m(){
setF(getF());
}
public int getF(){
return f;
}
public void setF(int f){
this.f= f;
}
}
class B{
int m(){
A a= new A();
a.setF(a.getF());
return a.getF();
}
}