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Some map implementations, like the TreeMap class, make specific guarantees as to their order (ascending key order) others, like the HashMap class, do not (does not guarantee that the order will remain constant over time).

The order of a map is defined as the order in which the iterators on the map's collection views return their elements. The Map interface provides three collection views, which allow a map's contents to be viewed as a set of keys, collection of values, or set of key-value mappings. A map cannot contain duplicate keys each key can map to at most one value. A map is an object that maps keys to values. List and Collection allow duplicate elements. A map cannot contain duplicate keys but it may contain duplicate values. The iterator returns the elements in no particular order (unless this set is an instance of some class that provides a guarantee). A set is a collection that contains no duplicate elements. You can easily solve all kind of Java Programming questions based on Objects and Collections by practicing the objective type exercises given below, also get shortcut methods to solve Java Programming Objects and Collections problems. How to solve Java Programming Objects and Collections problems? Multiple choice and true or false type questions are also provided. Here you can find objective type Java Programming Objects and Collections questions and answers for interview and entrance examination. Where can I get Java Programming Objects and Collections Interview Questions and Answers (objective type, multiple choice)?

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Solved examples with detailed answer description, explanation are given and it would be easy to understand. IndiaBIX provides you lots of fully solved Java Programming (Objects and Collections) questions and answers with Explanation. Where can I get Java Programming Objects and Collections questions and answers with explanation?

In this section you can learn and practice Java Programming Questions based on 'Objects and Collections' and improve your skills in order to face the interview, competitive examination and various entrance test (CAT, GATE, GRE, MAT, Bank Exam, Railway Exam etc.) with full confidence. Why Java Programming Objects and Collections?

Elements of programming interviews buy ebook