Collections are used in every programming language and initial java release contained few classes for collections: Vector, Stack, Hashtable, Array. But looking at the larger scope and usage, Java 1.2 came up with Collections Framework that group all the collections interfaces, implementations and alg...
java.util.Collectionsis a utility class consists exclusively of static methods that operate on or return collections. It contains polymorphic algorithms that operate on collections, “wrappers”, which return a new collection backed by a specified collection, and a few other odds and ends.This class...
It is derived from the large volume of traffic on the collections-comments alias. It serves as a design rationale for the collections framework. Core Interfaces - General Questions Why don't you support immutability directly in the core collection interfaces so that you can do away with ...
Now we're up to twenty or so interfaces and five iterators, and it's almost certain that there are still collections arising in practice that don't fit cleanly into any of the interfaces. For example, thecollection-viewsreturned by Map are natural delete-only collections. Also, there are ...
Test your knowledge with a wide range of practice questions that simulate the actual certification exam format. Detailed explanations for each question to help you understand the reasoning behind the correct answers. Interactive Learning Experience: ...
Java collections interview questions Q) What is List? Elements can be inserted or accessed by their position in the list, using a zero-based index. A list may contain duplicate elements. Q) What is Map? Map interface maps unique keys to values. A key is an object that we use to retrie...
You will be able to Answer questions on Java Platform, Wrapper Classes and Strings You will Understand New Features in Java 5, Java 6, Java 7 and Java 8 You will be able to Answer Questions on Collections, Generics and MultiThreading ...
Find the list of 200+ important Java interview questions along with the answers. These Java interview questions are based-on Core and advanced Java programming topics such as Core Java Concepts, Object-Oriented Programming (OOP), Java Collections Framework, Multithreading, Java I/O, Exception ...
Java5 has added several new ConcurrentCollection classes e.g. ConcurrentHashMap, CopyOnWriteArrayList, BlockingQueue etc, which has made Interview questions on Java Collection even trickier. Java Also provided way to get Synchronized copy of collection e.g. ArrayList, HashMap by using Collections.sync...
E - Element (used extensively by the Java Collections Framework, for example ArrayList, Set etc.) K - Key (Used in Map) N - Number T - Type V - Value (Used in Map) S,U,V etc. - 2nd, 3rd, 4th types Java Generic Method