For the Questions Below, Consider the Following Class Definition

question 57

Multiple Choice

For the questions below, 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;
}
}
-You want addEm to now add all three values and 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:

Trading Day

A day on which stock markets are open for trading, typically excluding weekends and public holidays.

Futures Contracts

Agreements to buy or sell a particular commodity or financial instrument at a predetermined price at a specific time in the future.

Profit (Loss)

The financial result of a company's operations and activities, determined by subtracting total expenses from total revenues over a given period.

Ounce

An ounce is a unit of weight commonly used in the United States and Britain, equivalent to 1/16 of a pound or about 28.35 grams.