Exemple

public class ClasseA {
Double d;
Float f;
public void methodeA() {

boolean b = d == Double.NaN;
// ...
boolean c = f == Float.NaN;
// ...
}

}
Solution
Initialisez i

public class ClasseA {
int i;
public ClasseA (int j){
i=j;
if (i<10){
//...
}
}

}