Objects and primitives can both be stored in arrays. These methods can be used directly, and we are not responsible for their implementation. Only homogeneous data type elements can be stored in arrays.īoth homogeneous and heterogeneous components can be stored in a collection.īecause arrays have no underlying data structure, there is no ready-made method support.Īny collection class is built on a standard data structure, and so there is ready-made method support for every demand as a performance. When it comes to performance, Arrays are the preferred to Collection.Ĭonsidering performance, Collection are not preferred to Arrays. We can change its size as per our requirement. The following are the primary distinctions between an array and a Collection: ArrayĪrrays have a set size, which means that once we build one, we can't change it to meet our needs.Ĭollection are naturally grow-able and can be customized to meet our needs. What is the difference between Array and Collection in java?Īrray and Collection are equivalent in terms of storing object references and manipulating data, but they differ in a number of ways. Java Collections Interview Questions for Freshers 1. Furthermore, users find it challenging to remember all of the various methods, syntax, and constructors included in each collection class. As a result, while the basic goal of all the collections is the same, their implementation was specified independently and there was no correlation between them. There was no common interface for all of these collections. Prior to the introduction of Collection Framework (or JDK 1.2), the standard techniques for aggregating Java objects (or collections) were Arrays, Vectors, or Hash Tables. Many interfaces (Set, List, Queue, Deque) and classes are available in the Java Collection framework (ArrayList, Vector, LinkedList, PriorityQueue, HashSet, LinkedHashSet, TreeSet). The two basic “root” interfaces of Java collection classes are the Collection interface () and the Map interface(). In JDK 1.2, a new framework called "Collection Framework" was created, which contains all of the collection classes and interfaces.Ĭollections in Java are capable of doing any data operations such as searching, sorting, insertion, manipulation, and deletion.Ī single unit of objects in Java is referred to as a collection.
In Java, a collection is a framework that provides an architecture for storing and manipulating a collection of objects. Write a program in java to join two arraylists into one arraylist. Write a program in java to get the collection view of the values present in a HashMap. Write a program in Java to clone a Treeset to another Treeset. Write a program to shuffle all the elements of a collection in Java. Write a program in Java to display the contents of a HashTable using enumeration. Given an array in Java, convert it to a collection. Differentiate between HashMap and TreeMap in the context of Java. Why does not the Map interface extend the Collection Interface or vice-versa? Why do we need synchronized ArrayList when we have Vectors (which are synchronized) in Java?
How can you synchronize an ArrayList in Java? Why does HashMap allow null whereas HashTable does not allow null? Differentiate between HashMap and HashTable. What is the use of Properties class in Java? What is the advantage of the Properties file? Differentiate between Iterator and Enumeration. What is the purpose of RandomAccess Interface? Name a collection type which implements this interface. Explain fail-fast and fail-safe iterators. What do you understand about BlockingQueue in Java? Differentiate between Comparable and Comparator in the context of Java. Java Collections Interview Questions for Experienced.How can you make an ArrayList read-only in Java?
Differentiate between Array and ArrayList in Java. What is the default size of the load factor in hashing based collection? Differentiate between HashSet and HashMap. Differentiate between Set and Map in Java. What are some of the best practices while using Java Collections? Can you add a null element into a TreeSet or HashSet? When would you prefer TreeSet to HashSet? Differentiate between HashSet and TreeSet. Differentiate between Iterator and ListIterator in Java. Differentiate between List and Set in Java. Differentiate between ArrayList and Vector in java. Difference between ArrayList and LinkedList. Explain the various interfaces used in the Collection framework. What are the advantages of the Collection framework? Explain the hierarchy of the Collection framework in Java. Differentiate between Collection and collections in the context of Java. What is the difference between Array and Collection in java?
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