LeetCode----14. Longest Common Prefix

Write a function to find the longest common prefix string amongst an array of strings.

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判断所有字符串的公共前序；

Runtime Error Message:Line 9: java.lang.StringIndexOutOfBoundsException: String index out of range: 2

Last executed input:["aaa","aa","aaa"]

为null判断

public class Solution {    public static String longestCommonPrefix(String[] strs) {       if(strs==null||strs.length==0){return "";}       String s=strs[0];       for(int i=1;i<strs.length;i++){           int j=0,index=0;           if(s.length()==0||s==null||strs[i]==null||strs[i].length()==0){return "";}           while(j<strs[i].length()&&j<s.length()&&s.charAt(j)==strs[i].charAt(j)){j++;}           s=s.substring(0,j);       }       return s;    }}