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The code given in the question is to prove that immutability is required to avoid any data integrity issues in the Map, because if we change the data hashcode is changed and we will never be able to get the associated value. It depends on the interview type, if its telephonic intrrview then expect more questions on core java related technologies. We can create a read-only collection using Collections.

Top 50 Java Collections Interview Questions and Answers

HashMap uses Key object hashCode and equals method to determine the index to put the key-value pair. Stack, PropertiesVector and Hashtable can be used in multi threaded environment because they are synchronized classes or thread-safe. I subscribed and got the PDFs. LinkedList are two Collections classes used for storing lists of object references Here are some key differences: HI, Great work done for qiestions all questions at one place.

Java Collections Interview Questions and Answers – JournalDev

The arrayList has to create a new array and copy all the elements there. Lower method finds the highest element lower than specified element. To increment a value of AtomicInteger, we use the incrementAndGet method. A Map is an object that maps keys to values. Please add more javx type of tricky interview questions.

ArrayList implements the list interface. There’s no really satisfactory answer, and forcing one leads to an unnatural interface.

However, search of an ArrayList is faster than LinkedList. It does work but can you tell me if possible why the exception is not getting thrown if the condition is made on the last entry?. At high level – Fail-fast is a property of a system or software with respect to its response to failures. Main differences between Java collection framework interview questions answers pdf download and Hashtable are: Let see example below:. Recently I started creating video tutorials too, so do check out my videos on Youtube.

Depending upon the size of your collection, it may be faster to add elements to a HashMap, then convert the map to a TreeMap for sorted key traversal.

Note on Some Important Terms Synchronized means only one thread can modify a hash table at one point of time. This scan is very slow. Java Collections Framework is the fundamental aspect of java programming language. Comparator interface compare Object o1, Object o2 method need to be implemented that takes two Object argument, it should be implemented in such a way that it returns negative int if first argument is less than the second one and returns zero if they are equal and positive int if first argument is greater than second one.

It is one of the most popular collections interview question for java developer. Note, however, that the penalty java collection framework interview questions answers pdf download choosing an excessively high value for initial capacity is less severe for this class than for HashSet, as iteration times for this class are unaffected by capacity.

After looking at a number of the blog posts on your blog, I seriously appreciate your way of blogging. Corresponding methods for finding lowest number higher than specified element are higher and ceiling.

Java Interview Questions and Answers PDF eBook Free Download (250+ Questions, 60 Pages)

Hence, insertion and deletion are faster than ArrayList. The expected number of entries in the map and its load factor should be taken into account when setting its initial capacity, so as to minimize the number of rehash operations.

Collections class contain these method implementations. So, inserting and deleting from an ArrayList are expensive operations. They are public boolean equals Object obj public int hashCode. The load factor is a measure of how full the hash table is allowed to get before its capacity is automatically increased.

24 Java Collections Framework Interview Questions & Answers for developers | FromDev

Java collection framework interview questions answers pdf download send me Java interviews ebook. If you have come this far, it means that you liked what you are reading. I guess in HashMap only null keys are supported and not null values. I was looking for some good interview question and found this.

Some of them are sorting, searching, shuffling, min-max values. Add method by default adds the element at the end of the list.

This is funny and nice. By the way, the definition of mutable is up in the air. I am not able to view all the questions though i am following you on twitter.