added two hashing java code

[aasthak108]

🛠️ 1227(Issue Number) SSOC'2023

1227

1755 pull request number

👨‍💻 Changes proposed

I have added the more efficient code in hashing.

1. Union of two arrays
2. Intersection of two arrays

✔️ Check List (Check all the applicable boxes)

-[Yes ] My code follows the code style proposed

• [Yes ] This PR does not contain plagiarized content.
• [ Yes] The title of my pull request is a short description of the requested changes.

📄 Note to reviewers

If you want to check it go to repository->Algorithms->Java->Hashing You can runt it in any IDE which supports Java.

📷 Screenshots

[github-actions[bot]]

Thanks for your contribution we will soon check your PR @aasthak108 :)

[aasthak108]

@Kumar-laxmi please check this out! And if any changes required assign me the issue. Thank you!!

[github-actions[bot]]

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