Java 我的扫描仪跳过下一个双精度和下一个整数？

每当我运行扫描仪时，它会在称重后跳过高度（双）环。它还可以跳过年龄后的级别（int）循环

这是我的扫描器课

导入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());  

    }
   }

---

这是我的扫描器课

在这两种情况下，在.nextLine（）中执行

操作后，.nextLine（）中缺少
。如果所有其他代码行都使用类似于.nextDouble（）

中的

in.nextLine（）

然后是.nextLine（）中的

in.nextLine（）

的东西工作，我猜这就是缺少的地方。

因为它完全跳过了循环，所以setHeight（）和setLevel（）的方法有问题

while（！person.setHeight（height））

---

若它跳过这个循环，那个么它一定意味着setHeight（height）在返回false时返回true，或者您需要去掉“！”

in.nextLine（）不起作用。我建议大家看看Sotirios Delimanolis发布的内容，因为他们似乎遇到了类似的问题。看起来可能是换行符“/n”造成的。