created: July 06, 2006, revised: 11/01/2012

Quiz on Comparable

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1. An interface, in general, is a list of what things?

A.    methods and variables

B.    classes and constants

C.    methods

D.    methods and constants

2. Say that you are writing a class Book and wish it to implement the Comparable<Book> interface. What method must Book contain?

A.    int compareTo( Book other )

B.    int compareTo( Object other )

C.    Book compareTo( Object other )

D.    boolean compareTo( T other )

3. What is the value of "zebra".compareTo("emu")

A.    a negative integer

B.    0

C.    a positive integer

D.    unpredictable

4. What is the value of (new Integer(5)).compareTo( new Integer(8) )

A.    a negative integer

B.    0

C.    a positive integer

D.    unpredictable

5. If the objects of a class are arranged into their natural order, then if object L is left of object R what is true?

A.    L.compareTo(R) is positive

B.    L.compareTo(R) is negative

C.    L.compareTo(R) is zero

D.    R.compareTo(L) is negative

6. If X.compareTo(Y) is positive, then which of the following is true?

A.    Y.compareTo(X) is positive

B.    Y.compareTo(X) is negative

C.    Y.compareTo(X) is zero

D.    Y.compareTo(X) is unknown

7. If X.equals(Y) is true, then which of the following is true for most classes that implement Comparable?

A.    X.compareTo(Y) is negative

B.    X.compareTo(Y) is zero

C.    X.compareTo(Y) is positive

D.    Nothing can be said.

8. What is "ZURICH".compareTo("cairo")

A.    a negative integer

B.    zero

C.    a positive integer

D.    unknown

9. What is "pit viper".compareTo("pit")

A.    a negative integer

B.    zero

C.    a positive integer

D.    unknown

10. What algorithm quickly searches an ordered array?

A.    binary search

B.    linear search

C.    random search

D.    ordered search

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