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單項(xiàng)選擇題

You want to use te Coherence Java APIs to directly cached POJOs. Consider this snippet of code:
NamedCache cache - CacheFactory.getCache("mycache"); 
cache.put(new Integer(I)f "hello");
cache.put(T,"hi"); 
cache.put(new Long(II),"hey"); 
This code inserts three objects into the cache. 
Why ?()

A. hashCode() and equals() method for each object type is different so a different key is used
B. each object value string is different so a different value is inserted on each put
C. equals() and compare() method is different for each put
D. POF need to be implemented for this to work properly

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