— Scott McNealy, Sun Microsystems Chairman, President and ceo

Output:
Sharpen your pencil
collections 
exercise
Note: answers are at the end of 
the chapter.

---

collections 
with 
generics
you are here
4
555
For each of the questions below, fill in the blank 
with one of the words from the “possible answers” 
list, to correctly answer the question. Answers are 
at the end of the chapter.
Given the following compilable statement: 
 
Collections.sort(myArrayList);
1. What must the class of the objects stored in 
myArrayList
implement? ________________
2. What method must the class of the objects stored in 
myArrayList
implement? ________________
3. Can the class of the objects stored in 
myArrayList
implement both
Comparator
AND 
Comparable
? ________________
Given the following compilable statement: 
 
Collections.sort(myArrayList, myCompare);
4. Can the class of the objects stored in 
myArrayList
implement 
Comparable
? ________________
5. Can the class of the objects stored in 
myArrayList
implement 
Comparator
? ________________
6. Must the class of the objects stored in 
myArrayList
implement 
Comparable
? ________________
7. Must the class of the objects stored in 
myArrayList
implement 
Comparator
? ________________
8. What must the class of the 
myCompare
object implement? ________________
9. What method must the class of the 
myCompare
object implement? 
__________________
Possible Answers:
Comparator,
Comparable,
compareTo( ),
compare( ),