New snippets in Java

[SarvariHarshitha]

Description

-Added new Category named Data type conversions in Java
-Added 4 different code snippets

Type of Change

• ✅ ✨ New snippet
• 🛠 Improvement to an existing snippet
• 🐞 Bug fix
• 📖 Documentation update
• 🔧 Other (please describe):

Checklist

• ✅ I have tested my code and verified it works as expected.
• ✅ My code follows the style and contribution guidelines of this project.
• ✅ Comments are added where necessary for clarity.
• Documentation has been updated (if applicable).
• ✅ There are no new warnings or errors from my changes.

Related Issues

Closes #

Additional Context

Screenshots (Optional)

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[Mathys-Gasnier]

Thanks for the contribution, but we will not be able to move on with your snippets as they dont match our guidelines, as they dont provide anything more that a "documentation" over java features. Please take a look at the guidelines of snippets in CONTRIBUTING.md, they were updated very recently.