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'Comparator' combinator can be used

Reports Comparator instances defined as lambda expressions that could be expressed using Comparator.comparing() calls. Chained comparisons which can be replaced by Comparator.thenComparing() expression are also reported.


myList.sort((person1, person2) -> person1.getName().compareTo(person2.getName())); myList2.sort((person1, person2) -> { int res = person1.first().compareTo(person2.first()); if(res == 0) res = person1.second().compareTo(person2.second()); if(res == 0) res = person1.third() - person2.third(); return res; });

After the quick-fixes are applied:

myList.sort(Comparator.comparing(Person::getName)); myList2.sort(Comparator.comparing(Person::first) .thenComparing(Person::second) .thenComparingInt(Person::third));

Locating this inspection


Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.

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.

Settings or Preferences | Editor | Inspections | Java | Java language level migration aids | Java 8

This inspection depends on the Java feature 'Lambda expressions' which is available since Java 8.


By default bundled with

IntelliJ IDEA 2024.1, Qodana for JVM 2024.1,

Can be installed with plugin

Java, 241.18072

Last modified: 18 June 2024