题解 | #最长公共前缀#

import java.util.*;


public class Solution {
    /**
     * 
     * @param strs string字符串一维数组 
     * @return string字符串
     */
    public String longestCommonPrefix (String[] strs) {
        // write code here
        if (strs == null || strs.length == 0) {
            return "";
        }
        if (strs.length == 1) {
            return strs[0];
        }
        String first = strs[0];
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < first.length(); i++) {
            for (int j = 1; j < strs.length; j++) {
                if (strs[j].length() < (i+1) || strs[j].charAt(i) != first.charAt(i)) {
                    return sb.toString();
                }
            }
            sb.append(first.charAt(i));
        }
        return sb.toString();
    }
}