added generics example method and tests

core-java/src/main/java/com/baeldung/generics/Generics.java

@@ -0,0 +1,24 @@
+import java.util.ArrayList;
+import java.util.List;
+
+public class Generics {
+
+	// definition of a generic method
+	public static <T> List<T> fromArrayToList(T[] a) {
+		List<T> list = new ArrayList<>();
+		for (T t : a) {
+			list.add(t);
+		}
+		return list;
+	}
+
+	// example of a generic method that has Number as an upper bound for T
+	public static <T extends Number> List<T> fromArrayToListWithUpperBound(T[] a) {
+		List<T> list = new ArrayList<>();
+		for (T t : a) {
+			list.add(t);
+		}
+		return list;
+	}
+
+}