Consider the Orderable interface and the partial implementation of the Temperature class defined below: public interface Orderable
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Question:
Consider the Orderable interface and the partial implementation of the
Temperature class defined below:
public interface Orderable
{
/** Returns −1,0, or 1 depending on whether the implicit
* object is less than, equal to, or greater than other.
*/
int compareTo (Object other);
}
public class Temperature implements Orderable
{
private String scale;
private double degrees;
//default constructor
public Temperature ()
{/* implementation not shown */}
//constructor
public Temperature(String tempScale, double tempDegrees)
{/* implementation not shown */}
public int compareTo(Object obj)
{/* implementation not shown */}
public String toString()
{/* implementation not shown */}
//Other methods are not shown.
}
Here is a program that finds the lowest of three temperatures:
public class TemperatureMain
{
/** Find smaller of objects a and b.*/
public static Orderable min(Orderable a, Orderable b)
{
if (a.compareTo(b)<0)
return a;
else
return b;
}
/** Find smallest of objects a, b, and c.*/
public static Orderable minThree(Orderable a,
Orderable b, Orderable c)
{
return min(min(a, b), c);
}
public static void main(String[] args)
{
/* code to test minThree method */
}
}
Which are correct replacements for /* code to test minThree method */?
I Temperature t1= new Temperature("C",85);
Temperature t2= new Temperature("F",45);
Temperature t3= new Temperature("F",120);
System.out.println("The lowest temperature is "+
minThree(t1, t2, t3));
II Orderable c1= new Temperature("C",85);
Orderable c2= new Temperature("F",45);
Orderable c3= new Temperature("F",120);
System.out.println("The lowest temperature is "+
minThree(c1, c2, c3));
III Orderable c1= new Orderable("C",85);
Orderable c2= new Orderable("F",45);
Orderable c3= new Orderable("F",120);
System.out.println("The lowest temperature is "+
minThree(c1, c2, c3));
(A) II only
(B) I and II only
(C) II and III only
(D) I and III only
(E) I, II, and III
Related Book For
Microeconomics An Intuitive Approach with Calculus
ISBN: 978-0538453257
1st edition
Authors: Thomas Nechyba
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