JAVA Collections Tutorials

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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...
    • 10593 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...
    • 16831 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/
    • 21210 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/
    • 20840 Hits
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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/
    • 15929 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/
    • 15600 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...
    • 11917 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
    • 9164 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...
    • 28958 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
    • 30638 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-...
    • 17246 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...
    • 18491 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...
    • 21389 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
    • 17996 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
    • 16863 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
    • 17365 Hits
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  • finding duplicates in a Array , file

    The following tutorial covers How to find and remove duplicates in array , file , line of text
    http://www.techlabs4u.com/2012/04/java-to-find-print-duplicates-using-or.html
    • 19171 Hits
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  • How to change ArrayList to HashSet in Java Example

    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
    • 16291 Hits
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  • How to create anonymous string array in Java Example

    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
    • 17174 Hits
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