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Core java - Interview Questions and Answers for 'Compro technologies' - 5 question(s) found - Order By Newest | ||||
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Ans. Hashcode is used for bucketing in Hash implementations like HashMap, HashTable, HashSet etc. The value received from hashcode() is used as bucket number for storing elements. This bucket number is the address of the element inside the set/map. when you do contains() then it will take the hashcode of the element, then look for the bucket where hashcode points to and if more than 1 element is found in the same bucket (multiple objects can have the same hashcode) then it uses the equals() method to evaluate if object are equal, and then decide if contain() is true or false, or decide if element could be added in the set or not. | ||||
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Like Discuss Correct / Improve  java   collections   hashcode   advanced  hashtable Asked in 33 Companies intermediate   frequent | ||||
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Ans. Destructor is used to de-allocate memory allocated by objects. There are no destructors in Java. Alternatively, Java provides Automatic garbage collection i.e automatically releasing the un-referenced memory. | ||||
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Like Discuss Correct / Improve  destructor  garbage collection Asked in 11 Companies Basic   frequent | ||||
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Ans. public class BuggyBread { public static void main(String args[]) { Map<Character, Integer> countMap = new HashMap(); String str = "hello world"; for (char character : str.toCharArray()) { if (countMap.containsKey(character)) { countMap.put(character, countMap.get(character) + 1); } else { countMap.put(character, 1); } } System.out.println(countMap); } } | ||||
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Like Discuss Correct / Improve  String  Code  Coding  Character Asked in 1 Companies | ||||
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This question was recently asked at 'Compro Technologies'.This question is still unanswered. Can you please provide an answer. | ||||
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Like Discuss Correct / Improve  code.coding.0 and cross game Asked in 1 Companies | ||||
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Ans. Garbage collection mechanism frees up the memory that is no longer needed. In languages like C / C++ the deallocation needs to be done explicitly by the programmer and hence any leniency may result in memory leak. Garbage collection in java ensures that all unused memory is reclaimed and hence there are no memory leaks.Moreover it relieves the programmer from the hassle of carefully releasing all memory. | ||||
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Like Discuss Correct / Improve  Garbage Collection  memory management Asked in 2 Companies | ||||