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| Java - Interview Questions and Answers | |||||
 Very frequently asked in different variations. Frequently asked in Deloitte ( 2 feedback ) , HCL Tech ( 3 feedback ) and Coginizant (CTS) | |||||
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| Ans. If the Object value will not change, use String Class because a String object is immutable. If the Object value can change and will only be modified from a single thread, use StringBuilder because StringBuilder is unsynchronized(means faster). If the Object value may change, and can be modified by multiple threads, use a StringBuffer because StringBuffer is thread safe(synchronized). | |||||
 Sample Code for String Sample Code for StringBuffer Sample Code for StringBuilder | |||||
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 Discuss Correct / Improve  java string class string stringbuilder stringbuffer  Asked in 27 Companies  basic  frequent | |||||
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| Which of the following is false about main method ? a. It should be declared public and static b. it should have only 1 argument of type String array c. We can override main method d. We can overload main method | |||||
