Making statements based on opinion; back them up with references or personal experience. How to make voltage plus/minus signs bolder? Similar with Bozho above. Roll with punchers, there is always tomorrow. Cast Object to List String in Java | The Object class is the super class of all Java classes. Word break II word split II, [Problems with the use of internal classes] No enclosing instance of type Outer is accessible. When to use LinkedList over ArrayList in Java? Instead of List, i need to cast List userList,this user Dto calas has some property like userId,userName,How can i access these property values from this list. How do you cast a List of supertypes to a List of subtypes? in your case: (List<Customer>) (Object)list; you must be sure that at runtime the list contains nothing but Customer objects. Filtering objects that arent of that type will look like this: Instead of filtering and applying the map to cast each element, we can perform all of this using a flatMap(). In this section, we will learn how to iterate a List in Java. Same class objects can be assigned one to another and it is what we have done with Officer1 class. First, we can serialize our User object to a byte array: byte [] data = SerializationUtils.serialize (user); Copy. How could my characters be tricked into thinking they are on Mars? How do I generate random integers within a specific range in Java? The method names are the same as the ones in the Apache Commons Lang library. and squeeze it into a list that can only take Customers. //Assuming that your object is a valid List object, you can use: Collections.singletonList (object) -- Returns an immutable list containing only the specified object. To convert the ArrayList<Object> to ArrayList<String> Create/Get an ArrayList object of String type. Is energy "equal" to the curvature of spacetime? extends Object>: List anotherList = new ArrayList <> (); boolean instanceTest = anotherList instanceof List<? 2 3 List<Object> list = Collections.singletonList(object); 4 Because the list is a List