leetcode-14. 最长公共前缀

class Solution {
    public String longestCommonPrefix(String[] strs) {
        if(strs.length == 0){
            return "";
        }
        //公共前缀比所有字符串都短，从头开始
        String s = strs[0];
        for (String string : strs) {
            // string.startsWith(s) 以什么字符串开始
            while(!string.startsWith(s)){
                if(strs.length == 0){
                    return "";
                }
                //公共前缀不匹配就变短
                s = s.substring(0, s.length() - 1);
            }
        }
        return s;
    }
}