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Reference to empty collection field can be replaced with method call

Reports usages of java.util.Collections fields: EMPTY_LIST, EMPTY_MAP or EMPTY_SET. These field usages may be replaced with the following method calls: emptyList(), emptyMap(), or emptySet(). Such method calls prevent unchecked warnings by the compiler because the type parameters can be inferred.


List<Integer> emptyList = Collections.EMPTY_LIST;

After the quick-fix is applied:

List<Integer> emptyList = Collections.emptyList();

This inspection only reports if the language level of the project or module is 5 or higher.

Inspection Details

Available in:

IntelliJ IDEA 2023.3, Qodana for JVM 2023.3


Java, 233.SNAPSHOT

Last modified: 13 July 2023