Interview Questions and Answers for 'TIAA' - 3 question(s) found - Order By Newest Very frequently asked in different variations. Frequently asked in Deloitte ( 2 feedback ) , HCL Tech ( 3 feedback ), TCS and Coginizant (CTS) Q1. Explain the scenerios to choose between String , StringBuilder and StringBuffer ? Core Java
Ans. If the Object value will not change, use String Class because a String object is immutable. Sample Code for String Sample Code for StringBuffer Sample Code for StringBuilder Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 29 Companies basic frequent Related Questions Difference between == and .equals() ? Why is String immutable in Java ? Why Char array is preferred over String for storing password? What are different ways to create String Object? Explain. What is a String Pool ? 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 ? What is StringJoiner ? Which of the following is false about main method ? Basic and Very Frequently asked. Ans. Polymorphism means the condition of occurring in several different forms. Sample Code for overloading Sample Code for overriding Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 108 Companies Basic frequent 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 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 ? 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 ? Ans. Generics are a facility of generic programming that were added to the Java programming language in 2004 within J2SE5.0. They allow "a type or method to operate on objects of various types while providing compile-time type safety. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 7 Companies Related Questions What are concepts introduced with Java 5 ? Is this a valid initialization ? Explain. Which of the following syntax is correct ?import static java.lang.System.*;or static import java.lang.System.*; Is it legal to initialize List like this ? Which of the following syntax are correct ?a. LinkedList<Integer> l=new LinkedList<int>();b. List<Integer> l=new LinkedList<int>();c. LinkedList<Integer> l=new LinkedList<Integer>();d. List<Integer> l = new LinkedList<Integer>(); Which of the following was not introduced with Java 5 ? What are Type Erasures in Java ? In case of generic class declared like following , What can T hold Can we use generics with arrays in Java ?
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Very frequently asked in different variations. Frequently asked in Deloitte ( 2 feedback ) , HCL Tech ( 3 feedback ), TCS and Coginizant (CTS)
java string class string stringbuilder stringbuffer String vs StringBuffer String vs StringBuilder String vs StringBuilder vs StringBuffer StringBuffer vs stringBuilder 
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Which of the following has been introduced with Java 8 ?
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