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This noncompliant example shows how the programmer can confuse overloading with overriding. At compile time, the type of the object array is {{List}}. The output that one would typically expectexpected output is {{ArrayList}}, {{LinkedList}} and {{List is not recognized}} ({{java.util.Vector}} does not inherit from {{java.util.List}}). However, in all three instances {{List is not recognized}} gets displayed. This happens because in overloading, the method invocations are not affected by the runtime types but only the compile time type ({{List}}). It is dangerous to implement overloading to tally with overriding, more so, because the latter is characterized by inheritance unlike the former. \[[Bloch 08|AA. Java References#Bloch 08]\] |
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This rule appears in the C++ Secure Coding Standard as VOID DCL12-CPP. Do not allow ambiguous definitions to be mutually visible.
References
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\[[API 06|AA. Java References#API 06]\] [Interface Collection|http://java.sun.com/j2se/1.4.2/docs/api/java/util/Collection.html] \[[Bloch 08|AA. Java References#Bloch 08]\] Item 41: Use overloading judiciously |
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