can anyone help with this questions?

Suppose that we have the following classes: public class ClassA//Line 1 {private int x;//Line 2 protected void setX(int a)//Line 3 {x =;//Line 4}} public class Test//Line 5 {public static void main(String [] args)//Line 6 {ClassA aObject;//Line 7 aObject.setX(4);//Line 8}} Explain the TWO reasons that make the above code incorrect? a) ______________ b) __________ 2. Suppose that Truck and Motorcycle are subclasses of Vehicle, Identify the following declarations as being valid or invalid. lf invalid tell why I. Truck t = new vehicle(); _________ ll. Vehicle v = new Truck(); ________. III. Motorcycle m1 = new vehicle(); IV. Motorcycle m2 = new Truck(); _________