28. Implement strStr()

Implement strStr().

Returns the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack.

思路：对应检查char是否一样，不一样直接跳出检查下一组。用boolean来判断这组是不是符合，如果符合直接输出。

119/145

public class Solution {public int strStr(String haystack, String needle) {if(haystack==null&&needle==null||haystack.length()<needle.length()){return -1;}for(int i=0;i<=haystack.length()-needle.length();i++){boolean check=true;for(int j=0;j<needle.length();j++){if(needle.charAt(j)!=haystack.charAt(i+j)){check=false;break;}}if(check==true){return i;}}return -1;}
}

转载于:https://www.cnblogs.com/Machelsky/p/5944465.html

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