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| Ans. Destructor is used to de-allocate memory allocated by objects. There are no destructors in Java. Alternatively, Java provides Automatic garbage collection i.e automatically releasing the un-referenced memory. | ||||
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 Discuss Correct / Improve  destructor garbage collection  Asked in 11 Companies  Basic  frequent | ||||
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| Ans. 1. Switching Overheads - Even though multi threading aims at improving performance by reducing the wait time and hence improving overall throughput, there is a cost of switching resources between threads and sometime this cost can surpass the benefits if there isnt much wait for IO or external communication. 2. Debugging is hard with multi threaded code. 3. Deadlock - Execution of multi threaded code many a times lead to deadlock due to shared resources. | ||||
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 Frequently asked Design Pattern interview question. | ||||
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| Ans. The prototype pattern is a creational design pattern. It is used when the type of objects to create is determined by a prototypical instance, which is cloned to produce new objects. Prototype is used when we need duplicate copies of objects. | ||||
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| Ans. 404 means the resource is not found on the server.The resource might not be deployed correctly. 500 means internal server error which means that resource was located but then it resulted in some exception or error. 200 means Ok. | ||||
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| Ans. An Exception in java is the occurrence during computation that is anomalous and is not expected. Exception handling is the mechanism which is used to handle such situations. | ||||
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| Discuss Correct / Improve exception handling Asked in 18 Companies basic frequent | ||||
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| Ans. Factory Design Patterns is the pattern that recommends creation of separate Factory Object for creation of other object. So its like saying - If you want to create an object of ClassA, Talk to FactoryObject ( which is an object of FactoryClass ). FactoryObject in itself encapsulates the inputs and logic required to make the decision regarding the creation and construction of object. | ||||
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| Ans. [Open Ended Answer] The objective of the question is to check how efficient one is in the language so that appropriate level questions are asked. Don't tell too high number if you are being interviewed for a junior or mid level position as the interviewer may throw advance level questions. | ||||
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| Ans. 1. Wrap the desired code in try block followed by a catch / finally to catch the exception 2. Declare the throws clause with exceptions that the code is expected to throw as an indication to the calling method to take care of it. | ||||
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| Ans. Abstraction, Encapsulation, Polymorphism , Composition and Inheritance | ||||
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| Discuss Correct / Improve core oops concepts Asked in 65 Companies basic frequent | ||||
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| Ans. Generally one reducer runs for all mappers, but it can be increased as per requirements. | ||||
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| Ans. Getting parent class object properties into child class is called Inheritance. The process of representing one form into multiple forms is called polymorphism. | ||||
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| Discuss Correct / Improve inheritance object oriented programming (oops) oops concepts polymorphism object oriented programming (oops) oops concepts Asked in 1 Companies Basic frequent | ||||
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| Ans. A program that uses HTTP for serving files that create web pages for users in response to their requests that are sent by the HTTP clients of their computer is called as a web server. Web - Server Types Apache HTTP Server by the Apache Software Foundation Internet Information Service from Microsoft Sun Java System Web Server Jigsaw Server. | ||||
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| Ans. The @Import annotation is used to import one or more @Configuration classes. This annotation provides the functionality equivalent to element in xml based configuration. The @ImportResource annotation is used to import one or more XML configuration files. | ||||
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| Ans. Assigning a value of one type to a variable of another type is known as Type Casting. Example : int x = 10; byte y = (byte)x; In Java, type casting is classified into two types, Widening Casting(Implicit) widening-type-conversion and Narrowing Casting (Explicitly done) narrowing-type-conversion. Widening or Automatic type converion - Automatic Type casting take place when,the two types are compatible and the target type is larger than the source type Example : public class Test { public static void main(String[] args) { int i = 100; long l = i; //no explicit type casting required float f = l;//no explicit type casting required System.out.println("Int value " i); System.out.println("Long value " l); System.out.println("Float value " f); } } Narrowing or Explicit type conversion - When you are assigning a larger type value to a variable of smaller type, then you need to perform explicit type casting. Example : public class Test{ public static void main(String[] args) { double d = 100.04; long l = (long)d; //explicit type casting required int i = (int)l;//explicit type casting required System.out.println("Double value " d); System.out.println("Long value " l); System.out.println("Int value " i); } } | ||||
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| This question was recently asked at 'Wipro'.This question is still unanswered. Can you please provide an answer. | ||||
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Which of the following about Garbage collection is false ?
