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Iteration over 'keySet()' can be optimized

Reports iterations over the keySet() of a java.util.Map instance, where the iterated keys are used to retrieve the values from the map.

Such iteration may be more efficient when replaced with an iteration over the entrySet() or values() (if the key is not actually used).

Similarly, keySet().forEach(key -> ...) can be replaced with forEach((key, value) -> ...) if values are retrieved inside a lambda.


for (Object key : map.keySet()) { Object val = map.get(key); }

After the quick-fix is applied:

for (Object val : map.values()) {}

Inspection Details

Available in:

IntelliJ IDEA 2023.3, Qodana for JVM 2023.3


Java, 233.SNAPSHOT

Last modified: 13 July 2023