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Interview Questions and Answers for 'Priceline.com' - 8 question(s) found - Order By Rating | ||||
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Ans. Everytime an object is serialized the java serialization mechanism automatically computes a hash value by passing the meta information for the class. This id is used during deserialization to verify that the sender and receiver of a serialized object have loaded classes for that object that are compatible with respect to serialization | ||||
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Like Discuss Correct / Improve  serialVersionUID  serialization Asked in 3 Companies expert   rare | ||||
Frequently asked in high end product companies. Frequently asked in Deloitte. | ||||
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Ans. https://medium.com/javarevisited/internal-working-of-hashmap-in-java-97aeac3c7beb#:~:text=HashMap%20internally%20uses%20HashTable%20implementation,the%20entries%20into%20the%20map. | ||||
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Like Discuss Correct / Improve  hashmap  collections  hashmap internal implementation Asked in 20 Companies expert   frequent | ||||
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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Like Discuss Correct / Improve  polymorphism  object oriented programming (oops)  oops concepts  oops concepts Asked in 108 Companies Basic   frequent | ||||
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Very frequently asked across all types of companies. | ||||
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Ans. Hashtable is synchronized whereas HashMap is not.HashMap allows null values whereas Hashtable doesnt allow null values. | ||||
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Like Discuss Correct / Improve  java   collections   hashmap   map   hashtable   hashmap vs hashtable Asked in 14 Companies basic   frequent | ||||
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Frequently asked in Cognizant (CTS) | ||||
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Ans. Storing the state of an object in a file or other medium is called serialization. Classes can communicate only if they are built together ( as they need Byte code for communication ). What if we need to enable communication between different applications ( i.e they have been built independently or even they reside at different locations ), We need a mechanism that will transfer the Bean state to a Medium than can be transferred to the receiving application. | ||||
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Like Discuss Correct / Improve  java   oops   serialization Asked in 18 Companies basic   frequent | ||||
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Ans. Serialization is the process of writing the state of an object to a byte stream. Deserialization is the process of restoring these objects. | ||||
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Like Discuss Correct / Improve  java   oops   serialization   deserialization   serialization vs deserialization Asked in 2 Companies basic   frequent | ||||
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Ans. Class , Heap , Stack , Register , Native Method Stack. | ||||
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Like Discuss Correct / Improve  java   jvm   memory management   memory   advanced   architecture   technical architect Asked in 1 Companies intermediate   frequent | ||||
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Very Frequently asked. Favorite question in walkins and telephonic interviews. Usually among first few questions. Asked in different variants. Must know for intermediate and expert professionals.Among Top 10 frequently asked questions. | ||||
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Ans. A Class must override the hashCode method if its overriding the equals method. | ||||
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Like Discuss Correct / Improve  java   collections   hashcode  hash code   equals   collections Asked in 44 Companies intermediate   frequent | ||||
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