Something

public class C1 {
	public int Fclasse(int x, int y) {
		return x-y;
	}
	public static int Fstatic(int x, int y) {
		return x-y;
	}
}

public class C2 {
	void main {
		C1 obj = new C1();
		int i = obj.Fclasse(5, 4);
		int j = C1.Fstatic(5, 4);
	}
}