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Interview Questions and Answers for 'Cloudera' - 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 )
  Q1. Why is String immutable in Java ?Core Java
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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   Like         Discuss         Correct / Improve     java   oops   string   string class   immutable  immutability   advanced     Asked in 39 Companies      expert        frequent

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 Q2. Write a method / program that will determine if the parenthesis are balanced in a given string.Core Java
Ans. https://www.geeksforgeeks.org/check-for-balanced-parentheses-in-an-expression/

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   Like         Discuss         Correct / Improve     string  code  coding     Asked in 14 Companies


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 Q3. Are arrays Thread Safe ?Core Java
Ans. Yes

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   Like         Discuss         Correct / Improve     arrays  concurrency     Asked in 1 Companies


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