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Subsequent steps can be fused into Stream API chain

Detects transformations outside a Stream API chain that could be incorporated into it.


List<String> list = stream.collect(Collectors.toList()); list.sort(null); return list.toArray(new String[list.size()]);

After the conversion:

return stream.sorted().toArray(String[]::new);

Note that sometimes the converted stream chain may replace explicit ArrayList with Collectors.toList() or explicit HashSet with Collectors.toSet(). The current library implementation uses these collections internally. However, this approach is not very reliable and might change in the future altering the semantics of your code.

If you are concerned about it, use the Do not suggest 'toList()' or 'toSet()' collectors option to suggest Collectors.toCollection() instead of toList and toSet collectors.

This inspection only reports if the language level of the project or module is 8 or higher.

Inspection options




Do not suggest 'toList()' or 'toSet()' collectors



Inspection Details

Available in:

IntelliJ IDEA 2023.3, Qodana for JVM 2023.3


Java, 233.SNAPSHOT

Last modified: 13 July 2023