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.

Example:

After the quick-fix is applied: