New examples (#6242)

Adding new examples.
Improvement in existing method.

core-java-8/src/test/java/com/baeldung/java8/lambda/methodreference/Bicycle.java

@@ -5,6 +5,11 @@ public class Bicycle {
     private String brand;
     private Integer frameSize;
 
+    public Bicycle(String brand) {
+        this.brand = brand;
+        this.frameSize = 0;
+    }
+
     public Bicycle(String brand, Integer frameSize) {
         this.brand = brand;
         this.frameSize = frameSize;

core-java-8/src/test/java/com/baeldung/java8/lambda/methodreference/MethodReferenceExamples.java

@@ -52,10 +52,18 @@ public class MethodReferenceExamples {
         bikes.add(bikeCreatorMethodReference.apply("GT", 40));
     }
 
+    @Test
+    public void referenceToConstructorSimpleExample() {
+        List<String> bikeBrands = Arrays.asList("Giant", "Scott", "Trek", "GT");
+        bikeBrands.stream()
+            .map(Bicycle::new)
+            .toArray(Bicycle[]::new);
+    }
+
     @Test
     public void limitationsAndAdditionalExamples() {
         createBicyclesList().forEach(b -> System.out.printf("Bike brand is '%s' and frame size is '%d'%n", b.getBrand(), b.getFrameSize()));
-        createBicyclesList().forEach((o) -> this.doNothingAtAll(o));
+        createBicyclesList().forEach((o) -> MethodReferenceExamples.doNothingAtAll(o));
     }
 
     private List<Bicycle> createBicyclesList() {