Java黑皮书课后题第10章：10.2（BMI类）将下面的新构造方法加入BMI类中
Java黑皮书课后题第10章：10.2（BMI类）将下面的新构造方法加入BMI类中
- 题目
- 程序说明
- 题目槽点
- 代码：Test2_BMI.java
- 运行实例
题目
程序说明
Test2_BMI.java：BMI类程序
这里我们参考编程练习题3.6的代码
题目槽点
题目内容表述的非常简略，简略得已经有很多地方省略了
刚开始根本搞不清楚出题人到底想干什么
后来才逐渐意识到应该把给出的构造方法和测试程序放在一起
我个人想到在前面本来也有求BMI的题，所以用到3.6的内容
代码：Test2_BMI.java
import java.util.Scanner;public class Test2_BMI {double weight, height_feet, height_inches;String name;int age;private static double KILOGRAMS_PER_POUND = 0.45359237;private static double METERS_PER_FEET = 0.3048;private static double METERS_PER_INCH = 0.0254;public Test2_BMI(String name, int age, double weight, double feet, double inches){this.age = age;this.name = name;this.weight = weight;height_feet = feet;height_inches = inches;}public double getBMI(){// Compute BMIdouble weightInKilograms = weight * KILOGRAMS_PER_POUND;double heightInMeters = height_feet * METERS_PER_FEET + height_inches * METERS_PER_INCH;return weightInKilograms / (Math.pow(heightInMeters,2));}public static void main(String[] args){Scanner input = new Scanner(System.in);// Prompt the user to enter weight in poundsSystem.out.print("Enter weight in pounds: ");double weight = input.nextDouble();// Prompt the user to enter height in feetSystem.out.print("Enter feet: ");double height_feet = input.nextDouble();// Prompt the user to enter height in inchesSystem.out.print("Enter inches: ");double height_inches = input.nextDouble();System.out.print("Enter name: ");String name = input.next();System.out.print("Enter age: ");int age = input.nextInt();Test2_BMI tb = new Test2_BMI(name, age, weight, height_feet, height_inches);double bmi = tb.getBMI();// Display resultSystem.out.println("BMI is "+bmi);if(bmi < 18.5)System.out.println("Underweight");else if(bmi < 25)System.out.println("Normal");else if(bmi < 30)System.out.println("Overweight");elseSystem.out.println("Obese");}
}
运行实例
Enter weight in pounds: 140
Enter feet: 5
Enter inches: 10
Enter name: liming
Enter age: 20
BMI is 20.087702275404553
Normal
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