新手求教大神:用java实现

我的应该符合了

 import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Scanner;



public class Test {
    public static void main(String[] args) throws IOException {

        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入数字,空格键分开:");
        String stringNumbers = scanner.nextLine();  
        //String num[] = stringNumbers.split("  ");
        int index = 0;
        for(index = 0; index < stringNumbers.length(); index++){
            if(stringNumbers.charAt(index) == ' ')
                break;
        }       
        int result= 0;
        int num1 = stoi(stringNumbers.substring(0, index));
        int num2 = stoi(stringNumbers.substring(index + 1, stringNumbers.length()));
        String s = String.format("数字和为:%d", num1 + num2);
        System.out.println(s);
    }

    public static int stoi(String s){
        int res = 0;
        for(int i = 0; i < s.length(); i++)
            res = res * 10 + s.charAt(i) - '0';
        return res;
    }
}

不知道这个到底怎么回事

String[] a = str.split(" ");
return a[0]+a[1];
这个意思么？

String[] a = str.split(" ");
return a[0]+a[1];
这个意思么？

.split(" ");

.split(" ");