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Interview Questions and Answers for 'RedMane' - 7 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) | ||||
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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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Like Discuss Correct / Improve  java   string class   string   stringbuilder   stringbuffer   String vs StringBuffer   String vs StringBuilder   String vs StringBuilder vs StringBuffer   StringBuffer vs stringBuilder Asked in 29 Companies basic   frequent | ||||
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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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Very frequently asked. Favorite question in Walk in Drive of many Indian service companies. | ||||
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Ans. Its a method which cannot be overridden. Compiler throws an error if we try to override a method which has been declared final in the parent class. | ||||
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Like Discuss Correct / Improve  java   oops   final   final method Asked in 30 Companies basic   frequent | ||||
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Very frequently asked. Usually asked in different variants like Diff between StringBuffer , String Builder ; Difference between StringBuilder and String class; Choice between these classes etc. | ||||
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Ans. A string buffer implements a mutable sequence of characters. A string buffer is like a String, but can be modified. At any point in time it contains some particular sequence of characters, but the length and content of the sequence can be changed through certain method calls. The String class represents character strings. All string literals in Java programs, such as "abc" are constant and implemented as instances of this class; their values cannot be changed after they are created. | ||||
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Like Discuss Correct / Improve  java   string   stringbuffer   frequently asked Asked in 18 Companies basic   frequent | ||||
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Very frequently asked. Favorite question in Walk in Drive of many Indian service companies. | ||||
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Ans. Final variable is a variable constant that cannot be changed after initialization. | ||||
Sample Code for final variable | ||||
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Like Discuss Correct / Improve  oops   java   final   final variable   basic interview question Asked in 12 Companies basic   frequent | ||||
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Ans. A trigger is a special kind of stored procedure that automatically gets executed upon an event in the database server. | ||||
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Like Discuss Correct / Improve  database   trigger Asked in 10 Companies basic   frequent | ||||
Frequently asked to fresh graduates. | ||||
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Ans. When a object invokes yield() it returns to ready state. But when an object invokes sleep() method enters to not ready state. | ||||
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Like Discuss Correct / Improve  java   threads   multi threading   yield   sleep   scheduling   operating system Asked in 4 Companies basic   frequent | ||||