问题描写叙述:
Implement strStr().
Returns a pointer to the first occurrence of needle in haystack, or null if needle is not part of haystack.
代码:
public class Implement_strStr { //java public String strStr(String haystack, String needle) { if(haystack == null || needle == null) return null; int pos = haystack.indexOf(needle); if(pos == -1) return null; return haystack.substring(pos); } }