Example Code Ch 09-5

question 46

Multiple Choice

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().

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Definitions:

Alzheimer's Disease

A progressive neurological disorder that causes memory loss, cognitive decline, and eventual loss of the ability to carry out everyday activities.

Tau Proteins

Proteins that stabilize microtubules in the brain, abnormal accumulations of which are implicated in various neurodegenerative diseases.

Acetylcholine

A neurotransmitter involved in muscle activation and various cognitive functions in the brain.

Glutamate

A common neurotransmitter that has been linked to memory and to dementia.