Add Top 100 Java Interview Questions document

[Copilot]

Create a comprehensive technical document covering the top 100 Java interview questions organized by category with code examples, difficulty levels, and best practices.

Note: This PR is incomplete due to technical issues during implementation. The interview-questions.md file needs to be populated with:

• Introduction - Java's industry importance and interview preparation guidance
• Categorized Questions (1-100):
  • Core Java Basics
  • Object-Oriented Programming
  • Java Collections Framework
  • Exception Handling
  • Multithreading & Concurrency
  • Memory Management & GC
  • Java I/O & Serialization
  • Java 8+ Features (Streams, Lambdas)
  • JVM Internals & Performance
• Question Format: Answer, code snippets, pitfalls, difficulty level (Beginner/Intermediate/Advanced)
• Best Practices Section - Interview strategies
• Conclusion

Document should follow repository conventions: 80-char lines, modern Java 25 features, instance main methods, implicit imports.

Original prompt

On interview-questions.md, Create a detailed technical document listing and explaining the Top 100 Java Interview Questions.
The document should include:

1. Introduction

   • Briefly explain the importance of Java in the software industry.
   • Highlight why interview preparation is crucial for Java developers.

2. Organization of Questions

   • Divide the 100 questions into clear categories:
     • Core Java Basics
     • Object-Oriented Programming (OOP)
     • Java Collections Framework
     • Exception Handling
     • Multithreading & Concurrency
     • Java Memory Management & Garbage Collection
     • Java I/O & Serialization
     • Java 8+ Features (Streams, Lambdas, Functional Interfaces)
     • JVM Internals & Performance

3. Question Format

   • Each question should be followed by:
     • A concise, clear answer.
     • Code snippets where relevant.
     • Notes on common pitfalls or misconceptions.
     • Real-world use cases or examples (where applicable).

4. Examples of Questions

   • Core Java: "What is the difference between == and .equals() in Java?"
   • Collections: "Explain the difference between HashMap and ConcurrentHashMap."
   • Concurrency: "What is the difference between synchronized and Lock interface?"
   • Java 8+: "How do Streams differ from traditional loops?"
   • JVM: "Explain the role of the ClassLoader in Java."

5. Difficulty Levels

   • Mark questions as Beginner, Intermediate, or Advanced.
   • Ensure a balanced distribution across levels.

6. Best Practices Section

   • Provide tips on how to approach Java interview questions.
   • Suggest strategies for answering conceptual vs. coding questions.
   • Include advice on demonstrating problem-solving and communication skills.

7. Conclusion

   • Summarize the importance of mastering these 100 questions.
   • Encourage continuous learning beyond interviews.

Formatting Requirements:

• Use numbered lists for questions (1–100).
• Group questions under category headings.
• Include code examples in proper formatting.
• Write in a professional, educational tone suitable for interview preparation.
• Ensure the document is cohesive, well-organized, and easy to follow.

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