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org.sonar.l10n.java.rules.squid.S1452.html Maven / Gradle / Ivy

Using a wildcard as a return type implicitly means that the return parameter should be considered as read-only but without any way to enforce this contract. 
Let's take the example of method returning a "List<? extends Animal>". Is it possible on this list to add a Dog, a Cat, ... we simply don't know. The consumer of a method should not have to deal with such disruptive questions. 
Noncompliant Code Example

List<? extends Animal> getAnimals(){...}