Longest Common Prefix

public class Solution {
    public String longestCommonPrefix(String[] strs) {
        //http://www.cnblogs.com/springfor/p/3872316.html
        if(strs==null || strs.length==0|| strs[0].length()==0) return "";
        for(int i=0;i<strs[0].length();i++){
            char x = strs[0].charAt(i);
            for(int j=1;j<strs.length;j++){
                if(strs[j].length()==i||strs[j].charAt(i)!=x)
                    return strs[0].substring(0,i);
            }
        }
        return strs[0];
    }
}