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| Interview Questions and Answers for 'Echostar' - 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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| 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 ? | ||||
| Frequently asked question for intermediate developers. Frequently asked in HCL Technologies and EPAM. | ||||
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| Ans. Volatile is a declaration that a variable can be accessed by multiple threads and hence shouldnt be cached. | ||||
 Sample Code for volatile | ||||
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| Discuss Correct / Improve java oops synchronization volatile java keywords Asked in 42 Companies intermediate frequent | ||||
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| How does volatile affect code optimization by compiler? | ||||
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| Ans. https://en.wikipedia.org/wiki/Database_normalization | ||||
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| Discuss Correct / Improve normalization database Asked in 35 Companies intermediate frequent | ||||
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| Difference between Normalization and Denormalization ? | ||||
| Which of the two Normalization / Denormalization facilitate better performance ? Which of the two facilitate better space management ? | ||||
