Though we can use Set as duplicate free Collection, some time we need to remove duplicates from ArrayList may be due to legacy code, or code inside an http://javarevisited.blogspot.com/2012/12/how-to-remove-duplicates-elements-from-ArrayList...
Unlike List and Sort, sorting Map implementations like HashMap and Hashtable is not easy. There are two ways to sort HashMap, either by key or by valu http://javarevisited.blogspot.com/2012/12/how-to-sort-hashmap-java-by-key-and-value.html
Set interface in Java is used to store unique elements, they restrict duplicates, but how do you find common elements between two set e.g. intersectio http://javarevisited.blogspot.com/2012/12/union-and-intersection-of-two-set-in-java-guava-...
BlockingQueue in Java is introduced as part of java.util.concurrent package in Java 5. BlockingQueue implements Queue interface, which is also added o http://javarevisited.blogspot.com/2012/12/blocking-queue-in-java-example-ArrayBlockingQueu...
Set has several implementation in Java Collection Framework e.g. EnumSet, HashSet, TreeSet, LinkedHashSet, and CopyOnWriteArraySet, this article compa http://javarevisited.blogspot.com/2012/11/difference-between-treeset-hashset-vs-linkedhash...
Unlike Collection classes, array does not provide any contains() method to search an object in array, only way to search in array is to loop through a http://javarevisited.blogspot.com/2012/11/4-ways-to-search-object-in-java-array-example.html
Read only collection means any collection which once created can not be modified i.e. you can not add new elements, you can not remove elements and ev http://javarevisited.blogspot.com/2012/07/create-read-only-list-map-set-example-java.html
Main difference between Set and List is that Set does not allow any duplicates and only store unique objects while List allow duplicates. Another diff http://javarevisited.blogspot.com/2012/04/difference-between-list-and-set-in-java.html
Quick way to convert ArrayList to Set in java with simple example , though its worth noting that all those method will eat duplicates silently and siz http://javarevisited.blogspot.com/2012/01/convert-arraylist-to-set-java-example.html
Anonymous array are good to implement variable argument methods and they are used for that purpose prior to jdk5 introduced varargs. http://javarevisited.blogspot.com/2012/01/anonymous-array-example-java-create.html
TreeMap in Java is the best solution for Java programs which are looking for sorted datastrucutre. TreeMap in Java sort keys based on either their nat http://javarevisited.blogspot.com/2011/12/treemap-java-tutorial-example-program.html
Java collection interview questions are core part of any java interview. Collection interview consists question on various collection classes like has http://javarevisited.blogspot.com/2011/11/collection-interview-questions-answers.html
Iterators in Java are core of Collection package. They provide most important traversing functionality around objects stored in Collections. No matter http://javarevisited.blogspot.com/2011/10/java-iterator-tutorial-example-list.html
have you used hashmap or hashset, if yes then you must be aware of where to use hashmap and where we can use hashset. if not then go and read this art http://javarevisited.blogspot.com/2011/09/difference-hashmap-vs-hashset-java.html
How HashMap works in Java or sometime how get method work in HashMap is common interview questions now days. Almost everybody who worked in Java knows http://javarevisited.blogspot.com/2011/02/how-hashmap-works-in-java.html#comment-form
This question oftenly asked in interview to check whether candidate understand correct usage of collection classes and aware of alternative solutions http://javarevisited.blogspot.com/2010/10/difference-between-hashmap-and.html
This question is from early ages of interview , I have not seen this question on recent interviews but it was common during 2006-2007 , now days quest http://javarevisited.blogspot.com/2010/10/what-is-difference-between-enumeration.html