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| Ans. It is the process of examining / modifying the behaviour of an object at runtime. | ||||
 Sample Code for reflection | ||||
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 Discuss Correct / Improve  java reflection reflection api ebay mindtree  Asked in 29 Companies  basic  frequent | ||||
 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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| Discuss Correct / Improve java oops final finally finalize final vs finally vs finalize Asked in 61 Companies basic frequent | ||||
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| Ans. A Stream is an abstraction that either produces or consumes information. There are two types of Streams : Byte Streams: Provide a convenient means for handling input and output of bytes. Character Streams: Provide a convenient means for handling input & output of characters. Byte Streams classes: Are defined by using two abstract classes, namely InputStream and OutputStream. Character Streams classes: Are defined by using two abstract classes, namely Reader and Writer. | ||||
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| Discuss Correct / Improve java file io streams byte stream character stream file handling Asked in 3 Companies | ||||
| Very frequently asked in companies using SOA. | ||||
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| Ans. REST or Representational State Transfer is a flexible architecture style for creating web services that recommends the following guidelines - 1. http for client server communication, 2. XML / JSON as formatiing language , 3. Simple URI as address for the services and, 4. stateless communication. | ||||
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| Discuss Correct / Improve java web services rest java j2ee architecture Asked in 14 Companies intermediate frequent | ||||
| Very frequently asked. Usually followed by questions related to private constructor and synchronized access. Frequently asked in JPMorgan and TCS (Based on 2 feedback) | ||||
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| Ans. http://www.buggybread.com/2014/03/java-design-pattern-singleton-interview.html | ||||
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| Discuss Correct / Improve java design pattern singleton at&t ebay fidelity india united healthcare india Asked in 46 Companies intermediate frequent | ||||
| Very Frequently asked. | ||||
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| Ans. throw is used to re throw an exception.throws is used to declare that the method throws the respective exceptions.try block is used to identify if the respective block has thrown any exception.catch is used to catch the exception that has been thrown by the respective try block. | ||||
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| Discuss Correct / Improve java exception handling throw throws try catch Asked in 5 Companies basic frequent | ||||
| Frequently asked to fresh graduates and less experienced developers. Among the first few questions in many interviews. | ||||
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| Ans. Composition - has-a relationship between objects. Inheritance - is-a relationship between classes. Composition - Composing object holds a reference to composed objects and hence relationship is loosely bound. Inheritance - Derived object carries the base class definition in itself and hence its tightly bound. Composition - Used in Dependency Injection Inheritance - Used in Runtime Polymorphism Composition - Single class objects can be composed within multiple classes. Inheritance - Single class can only inherit 1 Class. Composition - Its the relationship between objects. Inheritance - Its the relationship between classes. | ||||
| Sample Code for inheritance Sample Code for composition | ||||
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| Discuss Correct / Improve java java concepts inheritance object oriented programming (oops) oops concepts composition object oriented programming (oops) oops concepts inheritance object oriented programming (oops) inheritance vs composition object oriented programming (oops) oops concepts Asked in 29 Companies basic frequent | ||||
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| Ans. I have primarily worked on Web applications and hence worked on Struts , Spring , Hibernate, JSF ( Java Server Faces ) , Velocity etc. | ||||
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| Discuss Correct / Improve elsevier frameworks java frameworks general question Asked in 3 Companies basic frequent | ||||
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Which of the following is wrong for final instance variables ?
