Answer / manja

LinkedHashSet, TreeSet and HashSet are three of most popular implementation of Set interface in Java Collection Framework. Since they implement Set interface, they follow it's contract for not allowing duplicates. All these implementation except, TreeSet uses equals() method to check for duplicates, on the other hand TreeSet use compareTo() or compare() method for comparing objects and can break Set interface contract of unique element, if equals method is not consistent with compareTo() or compare() method. In this Java Collection tutorial, we will see difference between LinkedHashSet vs TreeSet vs HashSet on different points e.g. speed, performance, ordering, synchronization etc. Based upon these differences we can also decide when to use LinkedHashSet vs TreeSet vs HashSet in Java. TL;DR, Use HashSet for all general purpose usage i.e. where you need to store only unique elements without any ordering requirement. If you need to maintain order on which elements are added into Set then use LinkedHashSet, it provides ordering with little impact on performance. Use TreeSet when you absolutely nee to keep elements in specific sorted order e.g. keeping employee in increasing order of their age or salary. Remember, TreeSet is significantly slower than LinkedHashSet and HashSet because of this sorting overhead.

please mail me the interview question based on java/j2ee

0 Answers   Wipro,

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Q1. A. Write note on "The class path Environment Variable". B. Which are different kinds of source code? Q2. A. How to create an interface? B. Why convert an applet to an application? Q3. A. How to use Media tracker Class. B. How to use string tokenizer class. Q4. A. Explain the overview of UDP messaging. B. Difference between SQL Exception class and SQL Warning class. Q5. A. How to create com object in Java? B. Write short notes on "The properties class" Q6. A. When object is created and destroyed? B. Explain the JDB in depth & command line. C. Write short notes on Web Sites.

1 Answers  

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Hi Friends, i have searched in google but not clear. can you give bank example with synchronized keyword

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httt method

2 Answers   HCL,

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