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Java interview questions and answers for freshers Page 9

(#M40029427) JAVA QUESTION java Keep an EYE

Q. What is Constructor?

A. A constructor is a special method whose task is to initialize the object of its class. It is special because its name is the same as the class name. They do not have return types, not even void and therefore they cannot return values. They cannot be inherited, though a derived class can call the base class constructor. Constructor is invoked whenever an object of its associated class is created.

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(#M40029426) JAVA QUESTION java Keep an EYE

Q. What is servlet?

A. Servlets are modules that extend request/response-oriented servers, such as java-enabled web servers. For example, a servlet might be responsible for taking data in an HTML order-entry form and applying the business logic used to update a company's order database.

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(#M40029425) JAVA QUESTION java Keep an EYE

Q. What are different types of access modifiers?

A. public: Any thing declared as public can be accessed from anywhere. private: Any thing declared as private can't be seen outside of its class. protected: Any thing declared as protected can be accessed by classes in the same package and sub classes in the other packages. default modifier : Can be accessed only to classes in the same package.

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(#M40029424) JAVA QUESTION java Keep an EYE

Q. What is HashMap and Map?

A. Map is Interface and Hashmap is class that implements that.

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(#M40029423) JAVA QUESTION java Keep an EYE

Q. What is nested class?

A. If all the methods of a inner class is static then it is a nested class

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(#M40029422) JAVA QUESTION java Keep an EYE

Q. What is JIT and its use?

A. Really, just a very fast compiler In this incarnation, pretty much a one-pass compiler - no offline computations. So you can't look at the whole method, rank the expressions according to which ones are re-used the most, and then generate code. In theory terms, it's an on-line problem

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(#M40029421) JAVA QUESTION java Keep an EYE

Q. What is the purpose of Void class?

A. The Void class is an uninstantiable placeholder class to hold a reference to the Class object representing the primitive Java type void.

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(#M40029420) JAVA QUESTION java Keep an EYE

Q. What is mutable object and immutable object?

A. If a object value is changeable then we can call it as Mutable object. (Ex., String Buffer, If you are not allowed to change the value of an object, it is immutable object. (Ex., String, Integer, Float, -)

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(#M40029419) JAVA QUESTION java Keep an EYE

Q. What is the difference between yielding and sleeping?

A. When a task invokes its yield() method, it returns to the ready state. When a task invokes its sleep() method, it returns to the waiting state.

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(#M40029418) JAVA QUESTION java Keep an EYE

Q. What is the purpose of finalization?

A. The purpose of finalization is to give an unreachable object the opportunity to perform any cleanup processing before the object is garbage collected. For example, closing a opened file, closing a opened database Connection.

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