如何摆脱那个讨厌的领先加号？

我有一个基本上从文本文件中读取的代码.输出时有一个前导加号,因为答案是循环打印的.如何摆脱那个奇异的领先加号？我所能想到的就是将整个过程转换为字符串,然后取出前三个索引,但这太复杂了.有没有一种简单的方法来重新排列逻辑并做到这一点？

我的代码:

    /*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package importtextfiles;

/**
 *
 * @author Hana
 */
import java.io.*;
import java.util.*;
public class InputNumData {
    public static void main(String args[]) throws IOException
    {
        Scanner sf = new Scanner(new File("C:\\Users\\Hana\\SkyDrive\\CompSci\\Programming\\importTextFiles\\meow.txt"));
        int maxIndx = -1; //so the first index is 0

        String text[] = new String[1000];

        while(sf.hasNext()){
            maxIndx++;
            text[maxIndx] = sf.nextLine();
            System.out.println(text[maxIndx]);
        }

        sf.close();

        String answer = "";
        int sum;

        for(int j=0; j<=maxIndx; j++){
            Scanner sc = new Scanner(text[j]);
            sum = 0;
            answer = "";

            while(sc.hasNext()){
                int i = sc.nextInt();
                answer = answer + " + " + i;
                sum = sum + i;
            }
            answer = answer + " = " + sum;
            System.out.println(answer);
        }
    }
}

我的输出:

run:
12 10 3 5
18 1 5 92 6 8
2 9 3 22 4 11 7
 + 12 + 10 + 3 + 5 = 30
 + 18 + 1 + 5 + 92 + 6 + 8 = 130
 + 2 + 9 + 3 + 22 + 4 + 11 + 7 = 58
BUILD SUCCESSFUL (total time: 0 seconds)

meow.txt:

12 10 3 5
18 1 5 92 6 8
2 9 3 22 4 11 7

StackFlowed.. 5

只需将此行更改为

answer = answer.isBlank() ? i : answer + " + " + i;

有关它的工作原理是指更多的细节此.

只需将此行更改为

answer = answer.isBlank() ? i : answer + " + " + i;

有关它的工作原理是指更多的细节此.