Java代写:CS110 Circle

Requirement

In this Assignment, you should write a class that, given a circle’s radius, has methods that return the circle’s area, diameter, and circumference.
In case you have forgotten, the equations for a circle’s area, diameter, and circumference is given below.

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area = πrr
diameter = 2r
circumference = 2πr

Based on Chapter 3, Programming Challenge # 8 Circle class in your textbook. Your output is given below.

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Enter the radius of a circle: 5.3
The circle's area is 88.2472631
The circle's diameter is 10.6

The circle's circumference is 33.300854

Write a separate class called CircleDemo with a main method that asks the user for the circle’s radius, creates a Circle object, and then reports the circle’s area, diameter, and circumference using the circle’s getter methods.

Analysis

本题需要的数学背景见Pi,需要实现一个Circle类,以及对应的方法,如setRadius(),getRadius(),getArea(),getDiameter(),getCircumference()。
本题较为简单,注意数据类型,精度以及输入输出格式即可。

Tips

下面是ClicleDemo类的实现

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classCircleDemo{
privatedouble radius;
privatestaticfinal PI = 3.14159;

publicCircleDemo(){}

publicvoidsetRadius(){
this.radius = radius;
}

publicdoublegetRadius(){
returnthis.radius;
}

publicdoublegetArea(){
return CircleDemo.PI * this.radius * this.radius;
}

publicdoublegetDiameter(){
return2 * this.radius;
}

publicdoublegetCircumference(){
return2 * CircleDemo.PI * this.radius;
}
}