Example Code Ch 09-5

Example Code Ch 09-5
Consider the following class definition:
public class AClass
{
protected int x;
protected int y;
public AClass(int a, int b)
{
x = a;
y = b;
}
public int addEm()
{
return x + y;
}
public void changeEm()
{
x++;
y--;
}
public String toString()
{
return "" + x + " " + y;
}
}
-Refer to Example Code Ch 09-5: You want addEm to now add all three values, return the sum, and changeEm to change x and y, but leave z alone. Which should you do?

A) Redefine addEm and changeEm without referencing super.addEm() or super.changeEm() .
B) Redefine addEm to return the value of z+super.addEm() , but leave changeEm alone.
C) Redefine changeEm to call super.changeEm() and then set z = x + y, but leave addEm alone.
D) Redefine addEm to return the value of z+super.addEm() and redefine changeEm to call super.changeEm() and then set z = x + y.
E) Redefine changeEm to call super.changeEm() without doing anything to z, and redefine addEm to return super.addEm() .