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

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出自：Oracle认证

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