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| Core java - Interview Questions and Answers for 'Citi' - 7 question(s) found - Order By Newest | |||||
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| Ans. OOPs or Object Oriented Programming is a Programming model which is organized around Objects instead of processes. Instead of a process calling series of processes, this model stresses on communication between objects. Objects that all self sustained, provide security by encapsulating it's members and providing abstracted interfaces over the functions it performs. OOP's facilitate the following features 1. Inheritance for Code Reuse 2. Abstraction for modularity, maintenance and agility 3. Encapsulation for security and protection 4. Polymorphism for flexibility and interfacing | |||||
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 Discuss Correct / Improve  oops oops features  Asked in 237 Companies  basic  frequent | |||||
 Advanced level question usually asked in High end product companies. Have been asked in Google and Amazon (Based on 1 Feedback) | |||||
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| Ans. The Java runtime environment deletes objects when it determines that they are no longer being used. This process is known as garbage collection. The Java runtime environment supports a garbage collector that periodically frees the memory used by objects that are no longer needed. The Java garbage collector is a mark-sweep garbage collector that scans Java dynamic memory areas for objects, marking those that are referenced. After all possible paths to objects are investigated, those objects that are not marked (i.e. are not referenced) are known to be garbage and are collected. | |||||
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| Discuss Correct / Improve java garbage collection java memory management advanced Asked in 21 Companies intermediate frequent | |||||
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| Frequently asked. Favorite question in Walk in Drive of many Indian service companies. | |||||
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| Ans. clone() - Creates and returns a copy of this object. equals() - Indicates whether some other object is "equal to" this one. finalize() - Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. getClass() - Returns the runtime class of an object. hashCode() - Returns a hash code value for the object. toString() - Returns a string representation of the object. notify(), notifyAll(), and wait() - Play a part in synchronizing the activities of independently running threads in a program. | |||||
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| Discuss Correct / Improve java oops object class Asked in 16 Companies basic frequent | |||||
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| Very Frequently asked to fresh graduates and less experienced. Favorite question in Walk in drives. Frequently asked in Indian Services companies. | |||||
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| Ans. Overloading - Similar Signature but different definition , like function overloading. Overriding - Overriding the Definition of base class in the derived class. | |||||
 Sample Code for overloading Sample Code for overriding | |||||
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| Discuss Correct / Improve java oops overloading overriding oops concepts basic interview question Asked in 83 Companies basic frequent | |||||
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| Ans. ConcurrentHashMap is a hashMap that allows concurrent modifications from multiple threads as there can be multiple locks on the same hashmap. | |||||
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| Discuss Correct / Improve java collections hashmap map concurrenthashmap concurrenthashmap concurrency general electric ge Asked in 32 Companies rare | |||||
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| Ans. int count = 15; int[] fibonacci = new int[count]; fibonacci[0] = 0; fibonacci[1] = 1; for(int x=2; x < count; x++){ fibonacci[x] = fibonacci[x-1] + fibonacci[x-2]; } for(int x=0; x< count; x++){ System.out.print(fibonacci[x] + " "); } | |||||
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| Discuss Correct / Improve ebay fibonacci series Asked in 66 Companies basic frequent | |||||
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| Ans. Default size is 10. Regard how size will increase. Inside add() method there is one method called ensureCapacity() which will check list has enough size available. This ensureCapacity() method if found size of list need to increase then it will call grow() method which will create new list of extra size and copy existing list data to new one and return. | |||||
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| Discuss Correct / Improve list default size of list Asked in 1 Companies | |||||
Which of the following about Garbage collection is false ?
