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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)|
|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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|Like Discuss Correct / Improve  java   string class   string   stringbuilder   stringbuffer Asked in 27 Companies basic   frequent|
Try 3 Question(s) Test
|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 ?|
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