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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.

Example:

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 depends on the Java feature 'Stream and Optional API' which is available since Java 8.

Inspection options

Here you can find the description of settings available for the Subsequent steps can be fused into Stream API chain inspection, and the reference of their default values.

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

Not selected

Inspection Details

By default bundled with:

IntelliJ IDEA 2024.1, Qodana for JVM 2024.1,

Can be installed with plugin:

Java, 241.16690

Last modified: 29 April 2024