Java黑皮書課后題第10章：10.2（BMI類）將下面的新構造方法加入BMI類中

• 題目
• • 程序說明
  • 題目槽點
• 代碼：Test2_BMI.java
• 運行實例

題目

程序說明

Test2_BMI.java：BMI類程序
這里我們參考編程練習題3.6的代碼

題目槽點

題目內容表述的非常簡略，簡略得已經有很多地方省略了
剛開始根本搞不清楚出題人到底想干什么
后來才逐漸意識到應該把給出的構造方法和測試程序放在一起
我個人想到在前面本來也有求BMI的題，所以用到3.6的內容

代碼：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");} }

運行實例

Enter weight in pounds: 140 Enter feet: 5 Enter inches: 10 Enter name: liming Enter age: 20 BMI is 20.087702275404553 Normal

總結

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