Java 改进计算器循环的建议？

如果满足某些条件，我只想运行两个内部do while循环。如果运行程序，则始终显示错误消息。如何更正循环，使其仅在不满足条件时运行

整个程序的do while根据字符串答案重复循环。如果程序当前正在运行，循环将重复，但不允许输入dogName。只适合配重。我如何纠正这个问题

 public static void main(String[] args) {
 System.out.println(" Welcome to Chiecoman's Dog Age Calculator");
 System.out.println();


//variables for user input
String dogName;
int dogWeight=0; 
double dogAge, humanAge =0;
Scanner keyboard = new Scanner (System.in);
String answer;

do{
// User input begins
System.out.println("Please enter your dog's name:");
dogName = keyboard.nextLine();

System.out.println("Please enter your dog's age (1-16).");
dogAge = keyboard.nextDouble();
// do-while loop to repeat until condition is met
do
 {    
 System.out.println("Error: Age is out of Range");
 System.out.println("Please enter the actual dog age (1-16)");
 dogAge= keyboard.nextDouble();    
 }        
 while (dogAge <1 || dogAge >16);

System.out.println("Please enter your dog's weight in lbs");
dogWeight = keyboard.nextInt();
// do-while loop to repeat until condition is met
do
{
 System.out.println("Error: Weight must be greater than zero");
 System.out.println("Please enter your dog's weight in lbs");
}    
while (dogWeight <1);
// how dog age is calculated
if (dogAge ==1)
humanAge=15;
else if (dogAge >=2 && dogAge <=5)
  humanAge = 4 * dogAge +15;
else if (dogAge >= 6 && dogAge <= 16 && dogWeight <20 )
  humanAge = 4 * dogAge + 16;
else if (dogAge >= 6 && dogAge <= 16 && dogWeight >= 21 &&
     dogWeight <= 50)
  humanAge = 4.5 * dogAge + 15;
else if (dogAge >= 6 && dogAge <=16 && dogWeight > 50)
  humanAge = 7.5 * dogAge;
 // displays dog age
System.out.println(dogName + "'s age in human years is " +
  humanAge);
// ask user to calculate more dog ages
System.out.println("Would you like to calculate the age of another" +
  "dog (Y/N)?");
answer = keyboard.next();
}
while (answer.equalsIgnoreCase("y"));

publicstaticvoidmain（字符串[]args）{
System.out.println（“欢迎使用Chiecoman的狗龄计算器”）；
System.out.println（）；
//用于用户输入的变量
字符串dogName；
int体重=0；
双狗龄，人龄=0；
扫描仪键盘=新扫描仪（System.in）；
字符串回答；
做{
//用户输入开始
System.out.println（“请输入您的狗的名字：”）；
dogName=keyboard.nextLine（）；
System.out.println（“请输入您的狗的年龄（1-16）”；
dogAge=keyboard.nextDouble（）；
//执行while循环以重复，直到满足条件
做
{    
System.out.println（“错误：年龄超出范围”）；
System.out.println（“请输入实际犬龄（1-16）”；
dogAge=keyboard.nextDouble（）；
}        
而（16岁）；
System.out.println（“请以磅为单位输入您的狗的体重”）；
dogWeight=keyboard.nextInt（）；
//执行while循环以重复，直到满足条件
做
{
System.out.println（“错误：重量必须大于零”）；
System.out.println（“请以磅为单位输入您的狗的体重”）；
}    
while（dogWeight=2&&dogAge=6&&dogAge请记住，在do-while中，第一次迭代总是发生的。虽然对于代码来说不是最优的，但您可以在下面看到如何解决异常情况

import java.util.Scanner;

public class DogAgeCalc {

    public static void main(String[] args) {
        System.out.println(" Welcome to Chiecoman's Dog Age Calculator");
        System.out.println();


//variables for user input
        String dogName;
        int dogWeight = 0;
        double dogAge, humanAge = 0;
        Scanner keyboard = new Scanner(System.in);
        String answer;

        do {
// User input begins
            System.out.println("Please enter your dog's name:");
            dogName = keyboard.nextLine();
// do-while loop to repeat until condition is met
            boolean firstAgeInput = true;
            do {
                if (!firstAgeInput) System.out.println("Error: Age is out of Range");
                System.out.println("Please enter the actual dog age (1-16)");
                dogAge = keyboard.nextInt();
                firstAgeInput = false;
            }
            while (dogAge < 1 || dogAge > 16);


// do-while loop to repeat until condition is met
            boolean firstWtInput = true;
            do {
                if (!firstWtInput) System.out.println("Error: Weight must be greater than zero");
                System.out.println("Please enter your dog's weight in lbs");
                dogWeight = keyboard.nextInt();
                firstWtInput = false;
            }
            while (dogWeight < 1);

            // how dog age is calculated
            if (dogAge == 1)
                humanAge = 15;
            else if (dogAge >= 2 && dogAge <= 5)
                humanAge = 4 * dogAge + 15;
            else if (dogAge >= 6 && dogAge <= 16 && dogWeight < 20)
                humanAge = 4 * dogAge + 16;
            else if (dogAge >= 6 && dogAge <= 16 && dogWeight >= 21 &&
                    dogWeight <= 50)
                humanAge = 4.5 * dogAge + 15;
            else if (dogAge >= 6 && dogAge <= 16 && dogWeight > 50)
                humanAge = 7.5 * dogAge;
            // displays dog age
            System.out.println(dogName + "'s age in human years is " + humanAge);
// ask user to calculate more dog ages
            System.out.println("Would you like to calculate the age of another dog (Y/N)?");
            answer = keyboard.next();
        }
        while (answer.equalsIgnoreCase("y"));
    }
}

import java.util.Scanner；
公共类DogAgeCalc{
公共静态void main（字符串[]args）{
System.out.println（“欢迎使用Chiecoman的狗龄计算器”）；
System.out.println（）；
//用于用户输入的变量
字符串dogName；
int体重=0；
双狗龄，人龄=0；
扫描仪键盘=新扫描仪（System.in）；
字符串回答；
做{
//用户输入开始
System.out.println（“请输入您的狗的名字：”）；
dogName=keyboard.nextLine（）；
//执行while循环以重复，直到满足条件
布尔值firstAgeInput=true；
做{
如果（！firstAgeInput）System.out.println（“错误：年龄超出范围”）；
System.out.println（“请输入实际犬龄（1-16）”；
dogAge=keyboard.nextInt（）；
firstAgeInput=false；
}
而（狗龄<1 | |狗龄>16）；
//执行while循环以重复，直到满足条件
布尔输入=真；
做{
if（！firstWtInput）System.out.println（“错误：权重必须大于零”）；
System.out.println（“请以磅为单位输入您的狗的体重”）；
dogWeight=keyboard.nextInt（）；
firstWtInput=false；
}
而（体重<1）；
//如何计算狗的年龄
如果（dogAge==1）
人龄=15岁；
否则，如果（dogAge>=2&&dogAge=6&&dogAge=6&&dogAge=21&&
小狗体重=6（50只）
人龄=7.5*狗龄；
//显示狗的年龄
System.out.println（dogName+“，在人类年龄中的年龄是“+人类年龄）；
//请用户计算更多狗的年龄
System.out.println（“您想计算另一只狗的年龄（Y/N）？”；
答案=键盘。下一步（）；
}
while（答案：等信号情况（“y”））；
}
}
（1）如果不满足条件，可以使用while循环
（2） 你需要跳过空行

public static void main(String[] args) {
    System.out.println(" Welcome to Chiecoman's Dog Age Calculator");
    System.out.println();
    
    
    //variables for user input
    String dogName;
    int dogWeight=0; 
    double dogAge, humanAge =0;
    Scanner keyboard = new Scanner (System.in);
    String answer;
    
    do{
        // User input begins
        System.out.println("Please enter your dog's name:");
        dogName = keyboard.nextLine();
    
        System.out.println("Please enter your dog's age (1-16).");
        dogAge = keyboard.nextDouble();
        // do-while loop to repeat until condition is met
        while(dogAge <1 || dogAge >16){
            System.out.println("Error: Age is out of Range");
            System.out.println("Please enter the actual dog age (1-16)");
            dogAge= keyboard.nextDouble(); 
        }
    
        System.out.println("Please enter your dog's weight in lbs");
        dogWeight = keyboard.nextInt();
        // do-while loop to repeat until condition is met
        while(dogWeight <1){
            System.out.println("Error: Weight must be greater than zero");
            System.out.println("Please enter your dog's weight in lbs");
            dogWeight= keyboard.nextInt(); 
        }
        // how dog age is calculated
        if (dogAge ==1)
        humanAge=15;
        else if (dogAge >=2 && dogAge <=5)
            humanAge = 4 * dogAge +15;
        else if (dogAge >= 6 && dogAge <= 16 && dogWeight <20 )
            humanAge = 4 * dogAge + 16;
        else if (dogAge >= 6 && dogAge <= 16 && dogWeight >= 21 &&
                dogWeight <= 50)
            humanAge = 4.5 * dogAge + 15;
        else if (dogAge >= 6 && dogAge <=16 && dogWeight > 50)
            humanAge = 7.5 * dogAge;
        // displays dog age
        System.out.println(dogName + "'s age in human years is " + humanAge);
        // ask user to calculate more dog ages
        System.out.println("\nWould you like to calculate the age of another dog (Y/N)?");
        answer = keyboard.next();
        keyboard.skip("(\r\n)");  //to skip blank lines
    }
    while (answer.equalsIgnoreCase("y"));
}

publicstaticvoidmain（字符串[]args）{
System.out.println（“欢迎使用Chiecoman的狗龄计算器”）；
System.out.println（）；
//用于用户输入的变量
字符串dogName；
int体重=0；
双狗龄，人龄=0；
扫描仪键盘=新扫描仪（System.in）；
字符串回答；
做{
//用户输入开始
System.out.println（“请输入您的狗的名字：”）；
dogName=keyboard.nextLine（）；
System.out.println（“请输入您的狗的年龄（1-16）”；
dogAge=keyboard.nextDouble（）；
//执行while循环以重复，直到满足条件
while（16岁）{
System.out.println（“错误：年龄超出范围”）；
System.out.println（“请输入实际犬龄（1-16）”；
dogAge=keyboard.nextDouble（）；
}
System.out.println（“请以磅为单位输入您的狗的体重”）；
dogWeight=keyboard.nextInt（）；
//执行while循环以重复，直到满足条件
while（dogWeight=2&&dogAge=6&&dogAge确保您的重量输入在do-while循环的内部，如下所示

    bool initialWeightInput=true; // to avoid run into error message on first iteration
    // do-while loop to repeat until condition is met
    do
    {
      if(!initialWeightInput)
        System.out.println("Error: Weight must be greater than zero");

      initialWeightInput=false;
      System.out.println("Please enter your dog's weight in lbs");
      dogWeight = keyboard.nextInt();
    }    
    while (dogWeight <1);

bool initialWeightInput=true；//避免在第一次迭代时遇到错误消息
//执行while循环以重复，直到满足条件
做
{
如果（！initialWeightInput）
System.out.println（“错误：重量必须大于零”）；
initialWeightInput=false；
System.out.println（“请以磅为单位输入您的狗的体重”）；
dogWeight=keyboard.nextInt（）；
}    
（配重）