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Using the equivalence operators to compare values of boxed primitives can lead to erroneous comparisons.

Rule	Severity	Likelihood	Detectable	RepairableRemediation Cost	Priority	Level
EXP03-J	Low	Likely	Yes	YesMedium	P6P9	L2

Automated Detection

Detection of all uses of the reference equality operators on boxed primitive objects is straightforward. Determining the correctness of such uses is infeasible in the general case.

Empty String (Java) Instead Array (Java)

Tool

Version

Checker

Description

CodeSonar

Include Page

	CodeSonar_V
	CodeSonar_V

JAVA.COMPARE.EMPTYSTR
JAVA.COMPARE.EQ
JAVA.COMPARE.EQARRAY

Comparison to

empty string
Should Use equals()

instead of == (Java)
equals on

Array

Coverity

7.5

BAD_EQ
FB.EQ_ABSTRACT_SELF
FB.EQ_ALWAYS_FALSE
FB.EQ_ALWAYS_TRUE
FB.EQ_CHECK_FOR_OPERAND_NOT_ COMPATIBLE_WITH_THIS
FB.EQ_COMPARETO_USE_OBJECT_ EQUALS
FB.EQ_COMPARING_CLASS_NAMES
FB.EQ_DOESNT_OVERRIDE_EQUALS
FB.EQ_DONT_DEFINE_EQUALS_ FOR_ENUM
FB.EQ_GETCLASS_AND_CLASS_ CONSTANT
FB.EQ_OTHER_NO_OBJECT
FB.EQ_OTHER_USE_OBJECT
FB.EQ_OVERRIDING_EQUALS_ NOT_SYMMETRIC
FB.EQ_SELF_NO_OBJECT
FB.EQ_SELF_USE_OBJECT
FB.EQ_UNUSUAL
FB.ES_COMPARING_PARAMETER_ STRING_WITH_EQ
FB.ES_COMPARING_STRINGS_ WITH_EQ
FB.ES_COMPARING_PARAMETER_ STRING_WITH_EQ