Question

我有一个主要类来运行BMI计算器类，它计算BMI信息（体重指数），其中包含姓名，年龄，性别，身高和体重的字段。还有一个WaistToHip计算器类来计算腰部与臀部的比率腰部和臀部。但是，当我想创建一个 BodyFat计算器我需要两个班级的身高和腰围。我怎么想在我的身体脂肪计算器类中为我的公式调用这些？

public class body_fat_calculation {
    private double neck;
    private double CBF;
    waist_to_hip_ratio waist;
    bmiCalculator height;

    public body_fat_calculation(double neck) {
        super();
        this.neck = neck;
    }

    public double getCBF() {
        return CBF;
    }

    public void setCBF(double cBF) {
        CBF = cBF;
    }

    public double getNeck() {
        return neck;
    }

    public void setNeck(double neck) {
        this.neck = neck;
    }

    public double Round(double Rval, int Rpl){
        double p = Math.pow(10, Rpl);
        Rval=Rval*p;
        double tmp = Math.round(Rval);
        return tmp/p;
    }

    public void calculateWTHR(){
        CBF= Round((495/(1.0324 - 0.19077 * Math.log10((waist)-(neck)) + 0.15456 * Math.log10(height)) - 450),2);
    }
}

Answer 1

你为什么不这样做？如果你注意到我在BodyFatCalculator类中添加了两个参数 - 腰围和身高。

 public class Main {
    public static void main(string[] args){

    // I assume you will want to use a scanner to get user input to set these variables dynamically
    // for the sake of the example, I have set them myself.
    double height = 1.82; // meters
    double weight = 170.0;
    double waist = 35.0;
    double hip = 40.0;
    double neck = 7.1;
    String name = "Dave";
    String sex = "M";
    int age = 20;

    // create new BMI Calculator to figure out body mass index
    BMICalculator bmiCalc = new BMICalculator(name, age, sex, height, weight);
    double bmi = bmiCalc.calculateBmi(); // calculate body mass index

    WaistToHipCalculator waistHipCalc = new WaistToHipCalculator(waist, hip);
    double whr = waistHipCalc.calculateWhr(); // calculate waist to hip ratio

    BodyFatCalculator bfCalc = new BodyFatCalculator(neck, height, waist);
    double bf = bfCalc.calculateBf(); // calculate body fat

    // print results
  }
}

Answer 2

类是更多的名词。动词应该是一种方法。有一个名为BodyFatCalculation的类，我认为你很难使用很多类。只需将一个Body（名词）类与calculateBodyMassIndex和calculateBodyFat（动词）作为方法。您可以创建一个Dimensions类，其中包含高度和腰围（根据需要使用getter和setter）并在Body类中保留一个实例，但这样做太过分了。

从不同的类中调用对象

2 个答案: