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Note however, that the performance gains achieved by doing so may be meeker than the benefits of having more robust code that also takes non-constant and non-interned values. Moreover, such behavior encourages ambiguity that hinders selection of proper methods for comparing String objects.
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In general, for any two objects, it is permissible to compare their elements provided that the class is a singleton. The use of static factory methods over constructors facilitates instance control which in turn limits the effective number of instances of an immutable class to one. Thus, for two objects a and b, a.equals(b) is true only when a==b \[[Bloch 08|AA. Java References#Bloch 08]\]. The {{String}} class does not possess these characteristics. |
Risk Assessment
Using the equality or relational operators to compare objects may lead to unexpected results.
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