如何从扫描仪获取多个整数输入并将每个整数存储在单独的数组中？

Question

我正在尝试创建一个程序，该程序允许用户添加任意​​数量的数字对，方法是首先接受用户输入询问他们想要完成多少总和（2 个数字的加法），此后创建两个用户输入的任何大小的数组，然后要求用户在一行上输入他们想要添加的每对数字，并将第一个值存储在一个数组中，将第二个值存储在第二个数组中每个输入。这就是我卡住的地方，我不知道如何将用户输入作为每行上的两个 int 值并将它们存储在每个数组的相应索引中，以便稍后添加。请看下面我的代码：

import java.util.Scanner;

public class SumsInLoop {

public static void main(String[] args) {

    Scanner sc = new Scanner(System.in);

    System.out.println("Enter the amount of sums you would like to calculate: ");
    int n = sc.nextInt();

    int a[] = new int[n];
    int b[] = new int[n];

    String[] input = new String[2];
    System.out.println("Please enter the values you would like to sum as pairs of two numbers: ");
    for (int i = 0; i < a.length; i++) {
        input = sc.nextLine().split(" ");
            int[] intinput = Arrays.asList(input).stream().mapToInt(Integer::parseInt).toArray();
a = intinput[0];
b = intinput[1];
}
}

Answer 1

我认为您需要以这种方式更改 2 行：

a[i] = intinput[0];
b[i] = intinput[1];

Answer 2

您正在使用 nextLine() 方法，该方法对字符串输入很有用，但它不是整数或其他原始数据的最佳解决方案。

另外，这行代码是错误的：

a = intinput[0];

因为您将整数值存储为整数数组。 为了尊重变量类型，您必须将该值存储在 a[i] 中。

我会这样做：

public class SumsInLoop {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        System.out.println("Enter the amount of sums you would like to calculate: ");
        int n = sc.nextInt();

        int a[] = new int[n];
        int b[] = new int[n];

        for (int i = 0; i < a.length; i++) {
            System.out.println("Please enter the values you would like to sum as pairs of two numbers: ");
            // Read pair and store it inside i-th position of a and b arrays 
            System.out.println("Enter first number: ");
            a[i] = sc.nextInt();
            System.out.println("Enter second number: ");
            b[i] = sc.nextInt();
        }
        // Close scanner
        sc.close();

        // Prints every sum
        for(int i = 0; i < a.length; i++){
            System.out.println(i + "-th sum is: " + (a[i] + b[i]));
        }
    }
}

在这里，您可以使用特定于整数数据的 nextInt() 读取每一对。

每次你将项目存储在数组的第 i 个位置，所以最后你可以将 a[i] 和 b[i] 相加。

结果示例：

Enter the amount of sums you would like to calculate: 
4
Please enter the values you would like to sum as pairs of two numbers: 
Enter first number: 
2
Enter second number: 
1
Please enter the values you would like to sum as pairs of two numbers: 
Enter first number: 
3
Enter second number: 
4
Please enter the values you would like to sum as pairs of two numbers: 
Enter first number: 
5
Enter second number: 
6
Please enter the values you would like to sum as pairs of two numbers: 
Enter first number: 
7
Enter second number: 
8
0-th sum is: 3
1-th sum is: 7
2-th sum is: 11
3-th sum is: 15

Answer 3

只需使用扫描仪的nextInt() 方法读取对，它使用所有空格符号，如分隔符（不仅是行尾）：

public class SumsInLoop {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        System.out.println("Enter the amount of sums you would like to calculate: ");
        int n = sc.nextInt();

        int a[] = new int[n];
        int b[] = new int[n];

        System.out.println("Please enter the values you would like to sum as pairs of two numbers: ");
        for (int i = 0; i < a.length; i++) {
            a[i] = sc.nextInt();
            b[i] = sc.nextInt();
        }
    }
}