Java 什么'；这种方法有什么错。。。？

当输入为“1，2，3，4，5，a”时，我认为它没有读取输入5，结果总和=10，平均值=2！为什么会这样？ 顺便说一下，这只是一个方法，而不是整个代码

当scanner.nextInt（）提供“5”时，下一行scanner.hasNextInt（）为false。只需更改订单即可

import java.util.Scanner;

public class InputCalculator {
    public static void inputThenPrintSumAndAverage(){
        Scanner scanner = new Scanner(System.in);

        boolean first = true;

        int sum = 0;
        int count = 0;
        int avg = 0;
        while(true){
            int number = scanner.nextInt();
            boolean isAnInt = scanner.hasNextInt();

            if(isAnInt){
                sum += number;
                count++;
                avg = Math.round((sum)/count);
            }else{
                System.out.println("SUM = " + sum + " AVG = " + avg);
                break;
            }
            scanner.nextLine();
        }
        scanner.close();
    }
}

您还可以像这样清理代码

import java.util.Scanner;

public class InputCalculator {
    public static void inputThenPrintSumAndAverage(){
        Scanner scanner = new Scanner(System.in);

        boolean first = true;

        int sum = 0;
        int count = 0;
        int avg = 0;

        while(true){
            boolean isAnInt = scanner.hasNextInt();

            if(isAnInt){
                int number = scanner.nextInt();
                sum += number;
                count++;
                avg = Math.round((sum)/count);
            }else{
                System.out.println("SUM = " + sum + " AVG = " + avg);
                break;
            }
            scanner.nextLine();
        }
        scanner.close();
    }
}

当scanner.nextInt（）为您提供“5”时，下一行“scanner.hasNextInt（）为false”。只需更改订单即可

import java.util.Scanner;

public class InputCalculator {
    public static void inputThenPrintSumAndAverage(){
        Scanner scanner = new Scanner(System.in);

        boolean first = true;

        int sum = 0;
        int count = 0;
        int avg = 0;
        while(true){
            int number = scanner.nextInt();
            boolean isAnInt = scanner.hasNextInt();

            if(isAnInt){
                sum += number;
                count++;
                avg = Math.round((sum)/count);
            }else{
                System.out.println("SUM = " + sum + " AVG = " + avg);
                break;
            }
            scanner.nextLine();
        }
        scanner.close();
    }
}

您还可以像这样清理代码

import java.util.Scanner;

public class InputCalculator {
    public static void inputThenPrintSumAndAverage(){
        Scanner scanner = new Scanner(System.in);

        boolean first = true;

        int sum = 0;
        int count = 0;
        int avg = 0;

        while(true){
            boolean isAnInt = scanner.hasNextInt();

            if(isAnInt){
                int number = scanner.nextInt();
                sum += number;
                count++;
                avg = Math.round((sum)/count);
            }else{
                System.out.println("SUM = " + sum + " AVG = " + avg);
                break;
            }
            scanner.nextLine();
        }
        scanner.close();
    }
}