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April 16, 2019

## (Solved) : Work Educational Software Company Developing Suite Simple Physics Simulations Code Pendulu Q30131121 . . .

AbstractEarthPendulum:

AbstractPendulumPendulumRunner:

RegularPendulum:

SimplePendulum:

You work for an educational software company that is developing a suite of simple Physics simulations. The code in pendulum.zip is the beginning of a suite intended to permit the creation of a series of different types of pendulum simulation. You previously identified a code smell (trivial layer”) in the AbstractEarthPendulum class, but figured it was mostly harmless. Now your team wants to be able to dynamically set which planet a pendulum is on during an interactive simulation, and to allow different kinds of gravity models that are impossible to represent with a single constant (e.g., latitude models) 1. Run the main/test routine to see the expected behavior of the code. 2. Apply the refactoring approach “Collapse Hierarchy” to reduce the hierarchy levels by one Ensure that the main/test routine still works as expected. Make a copy of all the code in a folder called “RefactoringStepl” 3. Next, use the Strategy design pattern (shown below) to replace the field g with a reference to a strategy object (as outlined below). This will allow different kinds of gravity models to be associated with a Pendulum instance dynamically. Context interface Strategy ConcreteStrategyA ConcreteStrategyB te0 Name the strategy interface GravityModel, with a single method public double getGravitationalField Assume that objects implementing GravityModel will be initialized with all state required to produce the gravitational field value under their specific model, and that this occurs before being assigned to a pendulum. In other words, the pendulums will just use the model assigned to it via the GravityModel interface. Adjust the pendulum constructors so that a GravityModel is assigned on initialization, and add a new method that will allow the GravityModel to be changed dynamically Define one concrete strategy called GravityConstant. This class simply receives a constant value for g in its constructor. 4. Run the main/test routine to ensure that the functionality hasn’t changed. Copy all the code into a folder called “RefactoringStep2” Show transcribed image text

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