将用户输入的值相加并打印

Question

我需要将此程序的用户输入字符串的值添加到一起作为 Java 项目。我尝试过解析，但它似乎不起作用，我想不出许多其他简单的方法来查找字符串值的总和并打印它们。

import java.util.Scanner;

public class Lab4 {

    public static void main(String[] args) {

        int length;
        int counter;
        int sum = 0;

        Scanner input = new Scanner(System.in);

        System.out.println("How many numbers will you enter"); // input prompt
        length = input.nextInt();

        String[] number = new String[length];

        for (counter = 0; counter < length; counter++) {
            System.out.print("Number " + (counter + 1) + ": ");
            number[counter] = input.next();
        }

        input.close();

        System.out.print("The summation of ");
        for (counter = 0; counter < length - 1; counter++) {
            System.out.print(number[counter] + ", ");
        }
        System.out.print("and " + number[counter] + " is: ");

        System.out.print(""); // How would I go about printing a sum ofthe values of the string?

    }
}

Answer 1

你可以写以下逻辑：

for(int i=0;i<number.length;i++){
    try{
        sum+=Integer.parseInt(number[i]);
    }
    catch( Exception e ) {

    }
}
System.out.println("The sum is:"+sum);

Answer 2

使用streams（Java 8 中引入）你可以得到一行代码：

int sum = Arrays.stream(number).mapToInt(Integer::valueOf).sum();

Answer 3

在你的 for 循环中包含：sum += Integer.parseInt(number[counter])，最后打印出来

for(counter = 0; counter < length-1; counter++){
  System.out.print(number[counter] + ", ");
  sum += Integer.parseInt(number[counter]);
 } 

System.out.print(sum); // How would I go about printing a sum ofthe values of the string?