Question

我是Java新手，现在正在学习我的第一个Java课程。我正在尝试添加一个接收用户输入的数组，而不仅仅是用预定数字填充数组。获取数组总和的代码是否与预定数组相同？这是我的代码。

import java.util.Scanner;

public class Main {

public static void main(String[] args)
{

Scanner scan = new Scanner(System.in);

    int[] monthSales = new int[12];

    String[] monthNames = new String[12];
       monthNames[0] = "January";
       monthNames[1] = "February";
       monthNames[2] = "March";
       monthNames[3] = "April";
       monthNames[4] = "May";
       monthNames[5] = "June";
       monthNames[6] = "July";
       monthNames[7] = "August";
       monthNames[8] = "September";
       monthNames[9] = "October";
       monthNames[10] = "November";
       monthNames[11] = "December";

    int i = 0;

    while (i <= 11) 
    {
    System.out.println("What was the sales for the month of " + monthNames[i] + ": ");
    monthSales[i] = scan.nextInt();
    i++;

    }       
}
}

Answer 1

对数组求和的两种方法：

1）在Java 8中你可以这样做（假设数组被称为“monthSales”）：

int sum = IntStream.of(monthSales).sum();
System.out.println("The sum is " + sum);

2）或者你也可以这样做：

int sum = 0;

for (int i : monthSales)
    sum += i;

Answer 2

是的，它只是喜欢：

int sum = 0;
for (int i=0; i<monthSales.length; i++)
    sum += monthSales[i];

请注意：

使用for循环代替while，这将是非常易读，通用并使用i < monthNames.length代替i <= 11

Answer 3

只需遍历数组并将值添加到变量

int sum = 0;
for(int value: monthSales)
    sum += value;

在Java中获取数组的总和

3 个答案: