【Leetcode】Implement strStr()

题目链接：https://leetcode.com/problems/implement-strstr/

题目：

Implement strStr().

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

算法：

1. public int strStr(String haystack, String needle) {  
2. char h[] = haystack.toCharArray();  
3. char n[] = needle.toCharArray();  
4. int i = 0, j = 0;  
5. while (i < h.length && j < n.length) {  
6. if (h[i] == n[j]) {  
7.             j++;  
8.             i++;  
9. else {  
10. 1;  
11. 0;  
12.         }  
13.   
14.     }  
15. if (j == n.length) {  
16. return i - needle.length();  
17. else {  
18. return -1;  
19.     }  
20. }