Implement StrStr ()

    /** 28.      Implement strStr (); * 2016-4-16 by Mingyang * Very simple thinking, just beginning to write their own messy, back to learn from the online concise code * using SUBSTRING to express the process of intercepting a string, very effective, * so learn from the subst Ring and other self-band functions*/      Public intstrStr1 (String haystack, string needle) {intlen1=haystack.length (); intLen2=needle.length (); if(len1==0){                returnLen2==0?0:-1; }            if(len2==0)                return0; if(len1<len2) {                return-1; }            //the len1-len2 here need to find a good             for(intI=0;i<= (LEN1-LEN2); i++){                intJ=0; intk=i;  while(j<len2&&k<len1) {                    if(Haystack.charat (k) = =Needle.charat (j)) {k++; J++; }Else{                         Break; }                }                if(j==len2) {                    returnI//It's a little easier here .                }            }            return-1; }     Public intstrStr (String haystack, string needle) {intL1 = Haystack.length (), L2 =needle.length (); if(L1 <L2) {            return-1; } Else if(L2 = = 0) {            return0; }        intthreshold = L1-L2;  for(inti = 0; I <= threshold; ++i) {if(Haystack.substring (i, i +L2). Equals (needle)) {returni; }        }        return-1; }

Implement StrStr ()