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Interview Questions and Answers for 'Subex' - 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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Like 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 ? | ||||
Very Frequently asked to fresh graduates and less experienced. Favorite question in Walk in drives. Frequently asked in Indian Services companies. | ||||
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Ans. Overloading - Similar Signature but different definition , like function overloading. Overriding - Overriding the Definition of base class in the derived class. | ||||
Sample Code for overloading Sample Code for overriding | ||||
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Like Discuss Correct / Improve  java   oops   overloading   overriding   oops concepts   basic interview question   overloading vs overriding Asked in 86 Companies basic   frequent | ||||
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Related Questions | ||||
What are the difference between composition and inheritance in Java? | ||||
Explain OOPs or Explain OOPs Principles or Explain OOPs Concepts or Explain OOPs features or Tell me something about OOPs | ||||
What is the difference between Encapsulation and Abstraction? | ||||
What are points to consider in terms of access modifier when we are overriding any method? | ||||
What is Polymorphism in Java ? | ||||
Can you give a real world example of Encapsulation and Abstraction ? | ||||
Why every object constructor automatically call super() in Object before its own constructors? | ||||
How compiler handles the exceptions in overriding ? | ||||
Difference between Composition and Inheritance ? | ||||
Usually asked to entry level software developers. | ||||
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Ans. public static void main(String[] args) { int num1 = 1; int num2 = 2; num1 = num1^num2; num2 = num1^num2; num1 = num1^num2; System.out.print("num1 = " + num1 +", num2 = "+num2); } | ||||
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Like Discuss Correct / Improve  code  coding Asked in 37 Companies basic   frequent | ||||
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