LeetCode第3题：为何我的无重复字符最长子串代码在LeetCode平台和本地环境输出结果不同？

import java.util.*;
class Solution {
    public int lengthOfLongestSubstring(String s) {
        String temp1 = "";
        ArrayList<String> result = new ArrayList<String>();
        for (int i = 0; i < s.length(); i++) {
            boolean repeated = false;
            for (int j = 0; j < temp1.length(); j++) {
                if (temp1.charAt(j) == s.charAt(i)) {
                    repeated = true;
                    break;
                }
            }
            if (repeated) {
                result.add(temp1);
                temp1 = String.valueOf(s.charAt(i));
            } else {
                temp1 += String.valueOf(s.charAt(i));
            }
        }
        result.add(temp1); // 关键修正：添加最后一段子串
        int target = 0;
        for (int j = 0; j < result.size(); j++) {
            int t = result.get(j).length();
            if (t > target) {
                target = t;
            }
        }
        return target;
    }
}