admin管理员组

文章数量:1636896

Implement strStr().

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

Subscribe to see which companies asked this question

题目要求求字符串needle第一次在haystack中出现的位置

------------------------------------------------------------------------------------------------------------------------------------------------------------

public class Solution {
    public int strStr(String haystack, String needle) {
        if (needle.length() == 0) {
            return 0;
        }
        if (haystack.length() == 0) {
            return -1;
        }
        int result = -1;
        point:
        for (int index = 0; index <= haystack.length() - needle.length(); index++){
            for(int i = 0; i < needle.length(); i++) {
                if (haystack.charAt(index + i) != needle.charAt(i)){
                    break;
                }
                if (i == needle.length() - 1) {
                    result = index;
                    break point;
                }
            }
        }
        return result;
    }
}


本文标签: LeetCodeimplementJavastrStr