Add another method reference case

Author: marchof

src/main/java/io/javaalmanac/snippets/language/MethodReferences.java

@@ -33,6 +33,11 @@ static void classMethod() {
 			System.out.println("classMethod");
 		}
 
+		static int classMethodWithReturn(String parameter) {
+			System.out.println("classMethodWithReturn " + parameter);
+			return 42;
+		}
+
 	}
 
 	public static void main(String[] args) {
@@ -57,6 +62,11 @@ public static void main(String[] args) {
 		Runnable runnable2 = Foo::classMethod;
 		runnable2.run();
 
+		// Method return values are ignored if the functional interface method
+		// has return type void
+		Consumer<String> consumer2 = Foo::classMethodWithReturn;
+		consumer2.accept("hello");
+
 		// Array constructor as reference
 		IntFunction<Foo[]> function = Foo[]::new;
 		Foo[] array = function.apply(42);

src/test/java/io/javaalmanac/snippets/language/MethodReferencesTest.java

@@ -14,6 +14,7 @@ void run_main() throws Exception {
 				instanceMethod
 				instanceMethod hello
 				classMethod
+				classMethodWithReturn hello
 				42
 				""");
 	}