SCJP題庫第213題

 

Given a class whose instances, when found in a collection of objects, are sorted by using the compareTo() method, which two statements are true? (choose two.)

A. The class implements java.lang.Comparable.

B. The class implements java.util.Comparator.

C. The interface used to implement sorting allows this class to define only one sort sequence.

D. The interface used to implement sorting allows this class to define many different sort sequences.

Ans: AC

解說:

Comparable是在java.lang套件下

C是說實作排序時，僅能定義一種排序的順序 (sure)

D…，能定義許多不同的排序順序