Java 如何防止程序在用户每次输入数字时要求用户输入数字？

当我运行代码时，当用户输入一个数字，并希望输入另一个数字时，每次都会弹出此窗口，请输入一个介于0和100之间的值，或-1退出：

例如： 请输入一个介于0和100之间的值，或输入-1退出： 100 请输入一个介于0和100之间的值，或输入-1退出： 0 请输入一个介于0和100之间的值，或输入-1退出： -1 平均值为：50.0 最大值为：100.0 最小值为：0.0

我希望能够让用户输入一个enter列表，而不使用此选项。请输入一个介于0和100之间的值，或-1退出：每次弹出

例如： 100 0 -1 平均值为：50.0 最大值为：100.0 最小值为：0.0

请帮帮我。

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编程新手

只需删除第一个while循环中打印该消息的行，该行位于输入之前的第一个while循环末尾。

更改循环样式，使用do while循环而不是while循环

基本上，您希望至少进入循环一次，例如

import java.util.Scanner;

public class AverageMaxMin 
{
    @SuppressWarnings("resource")
    public static void main(String[] arg)
    {
        int count = 0;
        double sum = 0;
        double maxium = 0;
        double minium = 100;

        Scanner kb = new Scanner(System.in);

        System.out.println("Please enter a value between 0 and 100, or -1 to quit： ");
        double input = kb.nextDouble();

         while (input != -1)
            {

             while ((input > 100) || (input <= -1))
              {
                 System.out.println(" Invalid! Please enter a value between 0 and 100, -1 to show the result: ");
                 input = kb.nextDouble();
              }

                count++;             
                sum += input; 

                if (maxium < input)
                {
                    maxium = input;
                }

                if (minium > input)
                {
                    minium = input;
                }


                System.out.println("Please enter a value between 0 and 100, or -1 to quit： ");
                input = kb.nextDouble();

            }
                double average = (sum / count);  
                System.out.println("The average is: " + average);
                System.out.println("The maxium is: " + maxium);
                System.out.println("The minium is: " + minium);

    }

}

import java.util.Scanner;

public class Test {

    @SuppressWarnings("resource")
    public static void main(String[] arg) {
        int count = 0;
        double sum = 0;
        double maxium = 0;
        double minium = 100;

        Scanner kb = new Scanner(System.in);

        double input = -1;
        // Main processing loop...
        do {

            // Validation loop...
            do {
                System.out.println("Please enter a value between 0 and 100, or -1 to quit: ");
                input = kb.nextDouble();
                kb.nextLine();
            } while (input > 100);

            if (input > -1) {
                count++;
                sum += input;

                if (maxium < input) {
                    maxium = input;
                }

                if (minium > input) {
                    minium = input;
                }
            }
        } while (input != -1);

        double average = (sum / count);

        System.out.println(
                        "The average is: " + average);
        System.out.println(
                        "The maxium is: " + maxium);
        System.out.println(
                        "The minium is: " + minium);

    }

}

这确实使用了两个循环，您可以将其减少为一个，并忽略任何超出范围的值，例如

import java.util.Scanner;

public class AverageMaxMin 
{
    @SuppressWarnings("resource")
    public static void main(String[] arg)
    {
        int count = 0;
        double sum = 0;
        double maxium = 0;
        double minium = 100;

        Scanner kb = new Scanner(System.in);

        System.out.println("Please enter a value between 0 and 100, or -1 to quit： ");
        double input = kb.nextDouble();

         while (input != -1)
            {

             while ((input > 100) || (input <= -1))
              {
                 System.out.println(" Invalid! Please enter a value between 0 and 100, -1 to show the result: ");
                 input = kb.nextDouble();
              }

                count++;             
                sum += input; 

                if (maxium < input)
                {
                    maxium = input;
                }

                if (minium > input)
                {
                    minium = input;
                }


                System.out.println("Please enter a value between 0 and 100, or -1 to quit： ");
                input = kb.nextDouble();

            }
                double average = (sum / count);  
                System.out.println("The average is: " + average);
                System.out.println("The maxium is: " + maxium);
                System.out.println("The minium is: " + minium);

    }

}

import java.util.Scanner;

public class Test {

    @SuppressWarnings("resource")
    public static void main(String[] arg) {
        int count = 0;
        double sum = 0;
        double maxium = 0;
        double minium = 100;

        Scanner kb = new Scanner(System.in);

        double input = -1;
        // Main processing loop...
        do {

            // Validation loop...
            do {
                System.out.println("Please enter a value between 0 and 100, or -1 to quit: ");
                input = kb.nextDouble();
                kb.nextLine();
            } while (input > 100);

            if (input > -1) {
                count++;
                sum += input;

                if (maxium < input) {
                    maxium = input;
                }

                if (minium > input) {
                    minium = input;
                }
            }
        } while (input != -1);

        double average = (sum / count);

        System.out.println(
                        "The average is: " + average);
        System.out.println(
                        "The maxium is: " + maxium);
        System.out.println(
                        "The minium is: " + minium);

    }

}

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你认为System.out.println是做什么的？他说他不想每次都打印消息。这就是我的答案。我没有输入代码，因为我正在使用android应用程序，我不知道是否可以。但我本可以说得更清楚。