Software Engineering (10th Edition)
10th Edition
ISBN: 9780133943030
Author: Ian Sommerville
Publisher: PEARSON
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Chapter 14, Problem 14.1E
Program Plan Intro
System resilience:
System resilience is the judgement, with the help of which any system maintains continuity of systems critical resources during disruptive event which includes cyber-attack or failure of equipment. This comprises of four strategies which are mentioned below:
- Recognition
- Resistance
- Reinstatement
- Recovery
Expert Solution & Answer
Explanation of Solution
Recognition:
- In this type of strategy, the operators of the system detect any possible issues which can cause any sort of system failure and it is generally done before the failure is occurred.
Resistance:
- In this type of strategy, the critical parts of the system are focused as this strategy comes into action when there is any possibility of any cyber-attack is encountered. This action reduces the probability of system failure.
Recovery:
- This strategy is used when system has already taken place and only the critical services of the system are to be restored. With the use of this strategy the faith of the users can be maintained.
Reinstatement:
- This is the final activity that is implemented when the services of any failed system have been recovered and the system is performing all its activities in a normal condition.
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3. Problem Description: Define the Circle2D class that contains:
Two double data fields named x and y that specify the center of the circle with get
methods.
• A data field radius with a get method.
•
A no-arg constructor that creates a default circle with (0, 0) for (x, y) and 1 for radius.
•
A constructor that creates a circle with the specified x, y, and radius.
•
A method getArea() that returns the area of the circle.
•
A method getPerimeter() that returns the perimeter of the circle.
•
•
•
A method contains(double x, double y) that returns true if the specified point (x, y) is inside
this circle. See Figure (a).
A method contains(Circle2D circle) that returns true if the specified circle is inside this
circle. See Figure (b).
A method overlaps (Circle2D circle) that returns true if the specified circle overlaps with this
circle. See the figure below.
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Figure (a) A point is inside the circle. (b) A circle is inside another circle.
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