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See https://docs.oracle.com/javase/tutorial/java/javaOO/methodreferences.html

Kind of method references

Reference to a static method	=> ContainingClass::staticMethodName
Reference to an instance method of a particular object =>	containingObject::instanceMethodName
Reference to an instance method of an arbitrary object of a particular type =>	ContainingType::methodName
Reference to a constructor =>	ClassName::new