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並前往https://wiki.sei.cmu.edu/confluence/display/java/MET55-J.+Return+an+empty+array+or+collection+instead+of+a+null+value+for+methods+that+return+an+array+or+collection

Return an empty array or collection instead of a null

A null value is an example of an in-band error indicator, which is discouraged by ... class Inventory { private final Hashtable<String, Integer> items; ...

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