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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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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.
Which of the following is wrong for final instance variables ?
They cannot be changed after initialization
They can be initialized directly within static method
They can be declared and initialized together at the same place
They can be initialized within constructor
Which of the following is false for final ?
Final methods cannot be overriden
Final methods cannot be overloaded
Final classes cannot be subclassed
Final class cannot be abstract
Which of the following methods are used by Java Garbage Collection Mechanism ?
final
finally
finalize
All of the above
In which case finally won't get executed ?
in case of exception
in case of normal execution
in case of return statement before end of try block
in case of force program termination
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.
Q7. What is rule regarding overriding equals and hashCode method ?
A Class cannot override both hashcode and equals method.
A class can override both hashcode and equals method.
A Class must override hashCode method if its overridding equal method.
A Class can override hashCode even if its not overridding equals method.
Very frequently asked. Usually followed by questions related to private constructor and synchronized access. Frequently asked in JPMorgan and TCS (Based on 2 feedback)
Ans. It is a Design Pattern that facilitates loose coupling by sending the dependency information ( object references of dependent object ) while building the state of the object. Objects are designed in a manner where they receive instances of the objects from other pieces of code, instead of constructing them internally and hence provide better flexibility.
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Which of the following is wrong for final instance variables ?
