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Declare all enhanced for statement loop variables final. The final declaration causes Java compilers to flag and reject any assignments made to the loop variable.
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Compliant Solution
Declaring i to be final mitigates this problem by causing the compiler to fail to permit i to be assigned a new value:
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Assignments to the loop variable of an enhanced for loop (for-each idiom) fail to affect the overall iteration order, lead to programmer confusion, and can leave data in a fragile or inconsistent state.
Rule | Severity | Likelihood | Remediation Cost | Priority | Level |
|---|---|---|---|---|---|
DCL02-J | Low | Unlikely | Low | P3 | L3 |
Automated Detection
This rule is easily enforced with static analysis.
| Tool | Version | Checker | Description | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Parasoft Jtest |
| CERT.DCL02.ITMOD | Do not modify collection while iterating over it |
Bibliography
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