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| Solution - Interview Questions and Answers for 'Intuit' - 3 question(s) found - Order By Newest | ||||
 Advanced level question. Frequently asked in High end product companies. Frequently asked in Google , Cognizant and Deloitte ( Based on 2 feedback ) | ||||
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| Ans. 1. String Pool - When a string is created and if it exists in the pool, the reference of the existing string will be returned instead of creating a new object. If string is not immutable, changing the string with one reference will lead to the wrong value for the other references. Example - String str1 = "String1"; String str2 = "String1"; // It doesn't create a new String and rather reuses the string literal from pool // Now both str1 and str2 pointing to same string object in pool, changing str1 will change it for str2 too 2. To Cache its Hashcode - If string is not immutable, One can change its hashcode and hence it's not fit to be cached. 3. Security - String is widely used as parameter for many java classes, e.g. network connection, opening files, etc. Making it mutable might possess threats due to interception by the other code segment. | ||||
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 Discuss Correct / Improve  java oops string string class immutable immutability advanced  Asked in 39 Companies  expert  frequent | ||||
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 Related Questions | ||||
 Why Char array is preferred over String for storing password? | ||||
| How does making string as immutable helps with securing information ? How does String Pool pose a security threat ? | ||||
| How is string object immutable if we can concat a string to it ? | ||||
| How to implement an immutable class ? | ||||
| What is an immutable class ? | ||||
| What is an Immutable Object ? | ||||
| Does Declaring an object "final" makes it immutable ? | ||||
| Is String final in Java ? | ||||
| What are stateless objects ? How are they different from immutable objects ? Which of these two is thread safe ? | ||||
| Basic and Very Frequently asked. | ||||
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| Ans. Polymorphism means the condition of occurring in several different forms. Polymorphism in Java is achieved in two manners 1. Static polymorphism is the polymorphic resolution identified at compile time and is achieved through function overloading whereas 2. Dynamic polymorphism is the polymorphic resolution identified at runtime and is achieved through method overriding. | ||||
 Sample Code for overloading Sample Code for overriding | ||||
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| Discuss Correct / Improve polymorphism object oriented programming (oops) oops concepts oops concepts Asked in 108 Companies Basic frequent | ||||
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| Related Questions | ||||
| What are points to consider in terms of access modifier when we are overriding any method? | ||||
| If everything is an object , Cant we declare every object as Object obj = new String(); | ||||
| Why do we need polymorphism in Java ? | ||||
| How does java identifies which method to be called in method overriding or runtime polymorphism, when both methods share the same name and signature ? | ||||
| Shouldn't we make a class with all static members is its just expected to be executed as a standalone program with just one thread. Moreover Lets assume that there is no runtime Polymorphism required and there is no need for serialization ? | ||||
| Is this Polymorphism ? Map<String, List<String>> inventoryManagerCountMap = new HashMap<String, ArrayList<String>>(); | ||||
| When are static and instance methods resolved ? During compile time or Runtime ? | ||||
| Which of the following is not the difference between Singleton and Static class ( Class with static members only ) ? | ||||
| Which of the following do you think is the primary reason you would never use a static class even the application doesn't need multiple requests or threads ? a. Serialization b. Runtime Polymorphism c. Lazy Loading d. Memory | ||||
| Advanced level question frequently asked in US based companies. Recently asked in EMC and Intuit. | ||||
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| Ans. Simplest implementation we can have is a List wherein we can place ordered words and hence can perform Binary Search. Other implementation with better search performance is to use HashMap with key as first character of the word and value as a LinkedList. Further level up, we can have linked Hashmaps like , hashmap { a ( key ) -> hashmap (key-aa , value (hashmap(key-aaa,value) b ( key ) -> hashmap (key-ba , value (hashmap(key-baa,value) .................................................................................... z( key ) -> hashmap (key-za , value (hashmap(key-zaa,value) } upto n levels ( where n is the average size of the word in dictionary. | ||||
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| Discuss Correct / Improve java collections hashmap binary search search algorithm advanced architecture data structure Asked in 6 Companies frequent | ||||
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| Related Questions | ||||
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