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# LeetCode :-Implement strStr() with Solution

Hello DevCommunity

## Problem Statement

Implement strStr().

Given two strings needle and haystack, return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack.

Clarification:

What should we return when needle is an empty string? This is a great question to ask during an interview.

For the purpose of this problem, we will return 0 when needle is an empty string. This is consistent to C's strstr() and Java's indexOf().

Example 1:

Input: haystack = "hello", needle = "ll"
Output: 2
Example 2:

Input: haystack = "aaaaa", needle = "bba"
Output: -1

Constraints:

1 <= haystack.length, needle.length <= 104
haystack and needle consist of only lowercase English characters.

## Solution

``````class Solution {
public int strStr(String haystack, String needle) {
return haystack.indexOf(needle);
}
}
``````

### Conclusion

In this article, we learned way to solve LeetCode Problem Implement strStr() using java.