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Core java - Interview Questions and Answers for 'Ncr' - 6 question(s) found - Order By Newest | ||||
Very frequently asked. Favorite question in Walk in Drive of many Indian service companies. Frequently asked in HCL Technologies, TCS and Accenture. | ||||
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Ans. final - constant variable, objects cannot be de-referenced, restricting method overriding, restricting class sub classing. finally - handles exception. The finally block is optional and provides a mechanism to clean up regardless of what happens within the try block. Use the finally block to close files or to release other system resources like database connections, statements etc. finalize() - method helps in garbage collection. A method that is invoked before an object is discarded by the garbage collector, allowing it to clean up its state. | ||||
Sample Code for final Sample Code for finally Sample Code for finalize | ||||
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Like Discuss Correct / Improve  java   oops   final   finally   finalize   final vs finally vs finalize Asked in 61 Companies basic   frequent | ||||
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Ans. Abstract classes are only meant to be sub classed and not meant to be instantiated whereas concrete classes are meant to be instantiated. | ||||
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Like Discuss Correct / Improve  java   oops   abstract classes   Abstract vs Concrete Class Asked in 1 Companies basic   frequent | ||||
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Ans. Base Class is a relative term used to signify the Parent class in Parent - Child or Base - derived relationship. Derived Class is a relative term used to signify the Child class in Parent - Child or Base - derived relationship. Abstract Class is a class that is not allowed to be instantiated and hence can serve only a base class for it's usage. Concrete Class is the class which is supposed to be instantiated and hence provide definition for all implementing interface methods and extending abstract methods. | ||||
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Like Discuss Correct / Improve  Base Class   Derived Class   Abstract Class   Concrete Class | ||||
Very Frequently asked. Favorite question in walkins and telephonic interviews. Usually among first few questions. Asked in different variants. Must know for intermediate and expert professionals.Among Top 10 frequently asked questions. | ||||
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Ans. A Class must override the hashCode method if its overriding the equals method. | ||||
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Like Discuss Correct / Improve  java   collections   hashcode  hash code   equals   collections Asked in 44 Companies intermediate   frequent | ||||
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Usually asked with Questions related to Generics. | ||||
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Ans. Type erasure applies to the use of generics. When generics are used, they're pre compiled into compile time checks and execution-time casts. | ||||
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Like Discuss Correct / Improve  type erasures  generics Asked in 2 Companies intermediate   rare | ||||
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This question was recently asked at 'Bristlecone,Amazon Lab126,Amazon,Microsoft,Facebook,NCR,Google'.This question is still unanswered. Can you please provide an answer. | ||||
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Like Discuss Correct / Improve  arrays  code  coding Asked in 7 Companies   frequent | ||||