Java Programming and Technical

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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servlet is a single instance and multiple thread technologies.
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Java Other Question

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. 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.