JAVA Collections Tutorials

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  • How to Sort Collection in Java in descending Order

    Every Java program make heavy use of Collection framework. Collection classes are used to store huge number of data or value objects e.g. Employee, Or
    http://java67.blogspot.sg/2012/07/sort-list-ascending-descending-order-set-arraylist.html
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  • HashSet vs TreeSet

    HashSet and TreeSet are the leaves of the same branch , in java words they both implements the Set interface.
    http://javahungry.blogspot.com/2014/03/difference-between-hashset-and-treeset-similarities...
    • 27002 Hits
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  • Difference between HashMap and Hashtable

    Difference between HashMap and Hashtable is one of the most popular java interview questions.
    http://javahungry.blogspot.com/2014/03/hashmap-vs-hashtable-difference-with-example-java-i...
    • 27007 Hits
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  • Hashmap vs ConcurrentHashMap:Collection interview Ques

    The question hashmap vs concurrenthashmap is asked to check whether candidate has understanding of the concept concurrency .
    http://javahungry.blogspot.com/2014/02/hashmap-vs-concurrenthashmap-java-collections-inter...
    • 27140 Hits
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  • How to loop ArrayList in Java

    Multiple ways to loop or iterate ArrayList in Java
    http://beginnersbook.com/2013/12/how-to-loop-arraylist-in-java/
    • 26989 Hits
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  • How to trim the size of the ArrayList

    Java: How to trim the unused space allocated to the ArrayList
    http://beginnersbook.com/2013/12/java-arraylist-trimtosize-method-example/
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  • How to Serialize Map in Java

    Learn how to serialize a HashMap in Java
    http://beginnersbook.com/2013/12/how-to-serialize-hashmap-in-java/
    • 27003 Hits
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  • How to synchronize map in java

    Learn how to synchronize the Map in Java
    http://beginnersbook.com/2013/12/how-to-synchronize-hashmap-in-java-with-example/
    • 26989 Hits
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  • ArrayList vs Vector : Collection Interview question

    Difference between ArrayList and Vector is the most common Core Java Interview question you will come across in Collection . This question is mostly
    http://javahungry.blogspot.com/2013/12/difference-between-arraylist-and-vector-in-java-col...
    • 27043 Hits
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  • Java Tip to Initialize ArrayList in One Line

    We all use ArrayList for different purpose, but how do we add data into ArrayList, by calling add() method. Well, there is a nice Java tip which allow
    http://javarevisited.blogspot.com/2012/12/how-to-initialize-list-with-array-in-java.html
    • 26988 Hits
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  • How to avoid duplicate objects in Java List - Example

    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...
    • 27167 Hits
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  • Sorting Map by value and key in Java - ascending

    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
    • 27122 Hits
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  • Finding common objects in two Set with example

    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-...
    • 26991 Hits
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  • BlockingQueue Example in Java Concurrency

    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...
    • 27074 Hits
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  • HashSet vs TreeSet vs LinkedHashSet vs EnumSet in Java

    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...
    • 27082 Hits
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  • Searching in Array in Java Program Example

    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
    • 26996 Hits
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  • How to create read only Collection in Java with Example

    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
    • 26989 Hits
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  • What is different on List and Set in Java Collection

    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
    • 27118 Hits
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