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| Core java - Interview Questions and Answers for 'Citi' - 5 question(s) found - Order By Newest | |||||
 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  Capgemini NIIT Technologies
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| 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 LinkedIn Infosys Google Netflix Amazon Huawei Technologies JP Morgan enGenius CitiusTech Goldman Sachs Bank Of America India Salesforce Addteq Criteo Capgemini Horizon Solutions Way dot com Mphasis TrueCaller Intel Symantec intermediate 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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| 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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| 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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Which of following is not the method of object class ?
