Arrays : Jewels and Stones (Java Solution)

You're given strings jewels representing the types of stones that are jewels, and stones representing the stones you have.
Each character in stones is a type of stone you have.
You want to know how many of the stones you have are also jewels.

Letters are case sensitive, so "a" is considered a different type of stone from "A".

Example 1 :
Input : jewels = "aA", stones = "aAAbbbb"
Output : 3

Example 2 :
Input : jewels = "z", stones = "ZZ"
Output : 0

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