SEI CERT Oracle Coding Standard for Java

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Using reference equality to compare objects can lead to unexpected results.

Guideline Rule

Severity

Likelihood

Remediation Cost

Priority

Level

EXP01-J

low

probable

medium

P4

L3

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[[FindBugs 2008

AA. Bibliography#FindBugs 08]]

ES: Comparison of String objects using == or !=

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[[JLS 2005

AA. Bibliography#JLS 05]]

[§3.10.5, "String Literals"

http://java.sun.com/docs/books/jls/third_edition/html/lexical.html#3.10.5]

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§5.6.2, "Binary Numeric Promotion"

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[[Rogue 2000

AA. Bibliography#Rogue 2000]]

Rule 79: Use equals(), not ==, to test for equality of objects

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