3i Infotech Placement: Sample Questions 790 - 791 of 1245

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Question 790

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Essay▾

What is serializable interface?

Explanation

Understanding of Serialization or De-Serialization
  • Serializing an object converts its state to a byte stream. Byte stream can be reverted into a copy of the object.
  • A java object is serializable if its class or any of its super classes is serializable- classes that do not implement this interface will not have any of their state serialized or desterilized.
  • The serialization interface has no methods or fields and serves only to identify the semantics of being serializable.
  • It provides mechanism of writing the state of an object into a byte stream.
  • Used in hibernate, RMI, JPA, EJB and JMS technologies.

Question 791

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Essay▾

What is a USECASE? Why it is needed?

Explanation

  • Use cases provide sequence of actions of system that yield an observable result.
  • Used in system analysis to identify, clarify, and categorize system requirements.
  • Use case maps interactions between systems and users within an environment related to a particular goal.
  • Use case contain all significant system activities within a given system.
Given the Image is the Use Case

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