继承，父类与子类的问题

public class A {
    public static int y=0;
    public int x=23;
    public A(long x){
    }
    public A(int x){
        this(new Long(x));
        y=y+x;
    }
    public void f(int i, A o){}
    public void f(long lo,A o){}
    public void f(byte b,B o){}
}


public class B extends A{
    int x=17;
    public B(){
        super(1);
        new A(2);
        x++;
    }
    public B(int x){
        super(x);
        y=x+1;
        super.x=y+1;
    }
    public void f(int i,B o){}
    public void f(long lo,B o){}
    public void f(long lo,A o){}
}


public class C {
    public static void main(String[] args) {
        A aa1=new A(1L);
        A aa2=new A(42);
        B bb=new B();
        A ab=new B(3);

        int i=1;
        long lo=2;
        byte b=3;
        
        ab.f(b, bb);
        ab.f(lo, bb);
    }
}
为什么最后 ab.f(lo, bb); 对应的是Class B里面 public void f(long lo,A o){} 这个方法？ 求解答，谢谢！