Interview Questions and Answers for 'Rakuten' - 3 question(s) found - Order By Rating Frequently asked Generic Question. Q1. Why do you want to work for our company ? General
Ans. [Open Ended Answer] Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 42 Companies frequent Related Questions Describe, in general, how java's garbage collector works ? What is a ConcurrentHashMap ? What is Generalization and Specialization in terms of casting ? Which java frameworks have you used ? What the Bean scopes provided by Spring ? What are the various Auto Wiring types in Spring ? When should we use prototype scope and singleton scope for beans ? When do we generally get this database error - integrity constraint violated - parent key not found ? Write a program for Coin Changer application ? When do we generally get the database error - Unique Constraint Violated ? Frequently asked question for intermediate developers. Frequently asked in HCL Technologies and EPAM. Q2. What is Volatile keyword used for ? Core Java
Ans. Volatile is a declaration that a variable can be accessed by multiple threads and hence shouldnt be cached. Sample Code for volatile Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 42 Companies intermediate frequent Related Questions How does volatile affect code optimization by compiler? how is the internal code for the "volatile" implemented ? What are the different ways to avoid multi Threading related problems in Java ? Can we make array volatile in Java ? Have you heard of volatile Table in Teradata ? what is volatile and atomic Very frequently asked in different variations. Frequently asked in Deloitte ( 2 feedback ) , HCL Tech ( 3 feedback ), TCS and Coginizant (CTS) Q3. 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 ? What are different ways to create String Object? Explain. Why Char array is preferred over String for storing password? 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 ?
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