leetcode 最长公共前缀

easy

public String longestCommonPrefix(String[] strs) {
        if (strs == null || strs.length == 0) {
            return "";
        }
        StringBuffer buffer = new StringBuffer();


        int i = 0;

        while (true) {
            char c;
            if (strs[0].length() == i) {
                break;
            } else {
                c = strs[0].charAt(i);
            }
            boolean same = true;
            for (String s : strs) {
                if (s.length() == i) {
                    same = false;
                    break;
                }
                if (c != s.charAt(i)) {
                    same = false;
                    break;
                }
            }
            if (!same) {
                break;
            }
            buffer.append(c);
            i++;
        }
        return buffer.toString();
    }