Question

每当我运行扫描仪时，它会在重量后跳过高度（双）循环。它也会在年龄之后跳过级别（int）循环。

这是我的扫描仪课程。

import java.util.Scanner;

 public class HowHealthy
 {
   public static void main(String[] args)
    {
   String aGender = "";

   //New healthy objec tis created
   Healthy person = new Healthy();

   //Scanner object is created
   Scanner in = new Scanner(System.in);

   String name = "";
   while(!person.setName(name))
   {
       System.out.print("Person's name: ");
       name = in.nextLine();
       if(!person.setName(name))
       {
           System.out.println("Invalid name - must be at least one character!");
       }
   }

   char gender = '\0';
   while(!person.setGender(gender))
   {
       System.out.print(name + ", are you male of female (M/F): ");
       gender = in.nextLine().toUpperCase().charAt(0);
       if(!person.setGender(gender))
       {
           System.out.println("Invalid gender - must be M or F (upper or lower case)":
       }
    }

   double weight = 0;
   while(!person.setWeight(weight))
   {
       System.out.print(name + "'s weight (pounds): ");
       weight = in.nextDouble();
       in.nextLine();
       if(!person.setWeight(weight))
       {
           System.out.println("Invalid weight - must be at least 100 pounds!");
       }
    }

   double height = 0;
   while(!person.setHeight(height))
   {
       System.out.print(name + "'s height (inches): ");
       height = in.nextDouble();
       if(!person.setHeight(height))
       {
           System.out.println("Invalid height - must be 60..84, inclusively!");
       }
   }

   int age = 0;
   while(!person.setAge(age))
   {
       System.out.print(name + "'s age (years): ");
       age = in.nextInt();
       in.nextLine();
       if(!person.setAge(age))
       {
           System.out.println("Invalid age - must be at least 18!");
        }
   }

   System.out.println();

   System.out.println("Activity Level: Use these categories:");
   System.out.println("\t1 - Sedentary (little or no exercise, desk job)");
   System.out.println("\t2 - Lightly active (little exercise / sports 3-5 days/wk");
   System.out.println("\t3 - Moderately active(moderate exercise / sports 3-5
   System.out.println("\t4 - Very active (hard exercise / sports 6 -7 day/wk)");
   System.out.println("\t5 - Extra active (hard daily exercise / sports \n\t physica2X)

    int level = 0;
   while(!person.setLevel(level))
   {
       System.out.print("How active are you? ");
       level = in.nextInt();
       if(!person.setLevel(level))
       {
           System.out.println("Invalid acitvity level - must be 1..5, inclusively!");
        }
   }


   System.out.println();

   //Creates a new Healthy object and prints values based on user's input

   System.out.println(person.getName()+ "'s information");
   System.out.printf("Weight: %.1f %s \n", person.getWeight(), "pounds");
   System.out.printf("Height: %.1f %s \n", person.getHeight(), "inches");
   System.out.println("Age: " + person.getAge() + " years");

   if (gender == 'M')
   {
      aGender = "male";
   }      
   else
   {
      aGender = "female";
   }
   System.out.println("These are for a " + aGender);
   System.out.println();

   //Calculates the person's BMR, BMI and TDEE based on user input
   System.out.printf("BMR is %.2f \n", person.calcBMR());
   System.out.printf("BMI is %.2f \n", person.calcBMI());
   System.out.printf("TDEE is %.2f \n", person.calcTDEE());

   //Determines person's weight status based on BMI calculated
   double BMI = person.calcBMI();

   //Displays person's weight status
   System.out.println("Your BMI classifies you as " + person.calcWeightStatus());  

    }
   }

这是我的扫描仪课程。

Answer 1

在这两种情况下，执行in.nextLine()后都会遗漏in.nextInt()。如果所有其他代码行都在使用in.nextDouble()后跟in.nextLine()这样的内容，那么我的猜测是缺少的。

Answer 2

由于它完全跳过循环，因此setHeight（）和setLevel（）的方法有问题。

while(!person.setHeight(height))

如果它正在跳过这个循环，那么它必须意味着当setHeight（height）返回false时返回true，或者你需要摆脱'！'

我的扫描仪跳过我的下一个双下一个整数？

2 个答案: