Sorted collection with non-comparable elements
Reports construction of sorted collections, for example TreeSet, that rely on natural ordering, whose element type doesn't implement the Comparable interface.
It's unlikely that such a collection will work properly.
A false positive is possible if the collection element type is a non-comparable super-type, but the collection is intended to only hold comparable sub-types. Even if this is the case, it's better to narrow the collection element type or declare the super-type as Comparable because the mentioned approach is error-prone.
Locating this inspection
- By ID
Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.
SortedCollectionWithNonComparableKeys- Via Settings dialog
Path to the inspection settings via IntelliJ Platform IDE Settings dialog, when you need to adjust inspection settings directly from your IDE.
The inspection also reports cases when the collection element is a type parameter which is not declared as extends Comparable. You can suppress the warnings on type parameters using the provided option (for example, to keep the API compatibility).
New in 2018.3
Inspection options
Here you can find the description of settings available for the Sorted collection with non-comparable elements inspection, and the reference of their default values.
- Don't report non-comparable type parameters
Not selected
Availability
- By default bundled with
- Can be installed with plugin
Java, 241.18072