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Examples of Design by Contract in Java using Contract the Design by Example - A Simple Interface □ 1: interface Person { 1: class Employee implements 

  • What is contract in Java?

    The contract defines an abstraction barrier between the users and the implementers of the class.
    A user of the class can expect that objects will behave as described in the contract, but cannot expect anything more than what is specified in the contract.

  • Design by contract is a method of defining the specifications and expectations of a software component or module.
    It involves three elements: preconditions, postconditions, and invariants.
    Preconditions are the requirements that must be met before a method or function is executed.

  • What is an example of a precondition in design by contract?

    precondition: Something that must be true before object promises to do its work.
    Example: A hash map class has a put(key, value) and a get(key) method.
    A precondition of the get method is that the key was not modified since the time you put it into the hash map.

  • What is design by contract Java?

    Design by Contract™ is an approach to designing robust yet simple software.
    It provides methodological guidelines to achieve these goals without resorting to defensive programming.
    Instead, Design by Contract builds class invariants and pre/post validation of methods arguments and return values into the code itself.

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