Java工具集-数学(圆柱体,椎体工具类)

package *;

import java.text.DecimalFormat;

/**
 * @program: simple_tools
 * @description: 圆柱体,椎体工具类
 * @author: ChenWenLong
 * @create: 2019-06-03 17:59
 **/
public class CylinderUtils {

    public static final DecimalFormat ROUNDING_OFF = new DecimalFormat("#.00");

    /**
     * 功能描述:
     * 〈获取四舍五入的结果值,并且取得绝对值,解决负数情况〉
     *
     * @params : [value]
     * @return : double
     * @author : cwl
     * @date : 2019/6/3 15:50
     */
    public static double roundValue(double value){
        return Math.abs(Double.valueOf(ROUNDING_OFF.format(value)));
    }

    /**
     * 功能描述:
     * 〈是否是圆柱体〉
     *
     * @params : [r, highth]
     * @return : boolean
     * @author : cwl
     * @date : 2019/6/3 18:01
     */
    public static boolean isCylinder(double r,double highth){
        if(r == 0 || highth == 0){
            throw new IllegalArgumentException("This isn't Cylinder");
        }
        return true;
    }

    /**
     * 功能描述:
     * 〈获取圆柱体表面积〉
     *
     * @params : [r, highth]
     * @return : double
     * @author : cwl
     * @date : 2019/6/3 18:03
     */
    public static double getArea(double r,double highth){
        isCylinder(r,highth);
        return roundValue(2*Math.PI*r*highth);
    }

    /**
     * 功能描述:
     * 〈获取圆柱体体积〉
     *
     * @params : [r, highth]
     * @return : double
     * @author : cwl
     * @date : 2019/6/3 18:06
     */
    public static double getVolume(double r,double highth){
        isCylinder(r,highth);
        return calculateVolume(r,highth,false);
    }

    /**
     * 功能描述:
     * 〈计算是圆柱体还是圆锥体的体积〉
     *
     * @params : [r, highth, isCircularCone]
     * @return : double
     * @author : cwl
     * @date : 2019/6/4 10:56
     */
    private static double calculateVolume(double r, double highth, boolean isCircularCone) {
        if(isCircularCone){
            double proportion = 1 / 3;
            return roundValue(proportion*r*r*Math.PI*highth);
        }
        return roundValue(r*r*Math.PI*highth);
    }

    /**
     * 功能描述:
     * 〈获取圆柱体横截面积〉
     *
     * @params : [r, highth]
     * @return : double
     * @author : cwl
     * @date : 2019/6/4 10:10
     */
    public static double getCAS(double r,double highth){
        isCylinder(r,highth);
        return roundValue(2*r*highth);
    }

    /**
     * 功能描述:
     * 〈获取圆锥体的体积〉
     *
     * @params : [r, highth]
     * @return : double
     * @author : cwl
     * @date : 2019/6/4 10:36
     */
    public static double getVolume(double r,double highth,boolean isCircularCone){
        isCylinder(r,highth);
        return calculateVolume(r,highth,isCircularCone);
    }

}