Trivial usage of functional expression

Last modified: 03 December 2024

Reports functional interface methods calls that are directly invoked on the definition of the lambda, method reference, or anonymous class. Such method calls can be replaced with the body of the functional interface implementation.

Example:

boolean contains(List<String> names, String name) {
  return ((Predicate<String>)x -> {
    return names.contains(x);
  }).test(name);
}

When the quick-fix is applied, the method call changes to:

boolean contains(List<String> names, String name) {
  return names.contains(name);
}

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.

TrivialFunctionalExpressionUsage
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 | Declaration redundancy

Inspection Details

By default bundled with:

IntelliJ IDEA 2024.3, Qodana for JVM 2024.3,

Can be installed with plugin:

Java, 243.23126