Java Interview Questions – Best Practices & Coding Standards

Q1: [Amazon] What are Java coding best practices?

Answer:

  • Use meaningful variable names.
  • Follow proper indentation.
  • Use try-with-resources for resource management.

Q2: [Google] How do you write clean code in Java?

Answer: Follow SOLID principles, remove duplicate code, and use design patterns.


Q3: [Microsoft] What are the SOLID principles?

Answer:

  1. Single Responsibility Principle (SRP)
  2. Open-Closed Principle (OCP)
  3. Liskov Substitution Principle (LSP)
  4. Interface Segregation Principle (ISP)
  5. Dependency Inversion Principle (DIP)

Q4: [Netflix] What is the DRY principle in Java?

Answer: Don’t Repeat Yourself – Avoid code duplication.


Q5: [Facebook] What is YAGNI in Java programming?

Answer: You Aren’t Gonna Need It – Don’t add features until they are required.


Q6: [Oracle] What is KISS in Java?

Answer: Keep It Simple, Stupid – Keep code simple and easy to understand.


Q7: [Uber] What are the common mistakes Java developers make?

Answer:

  • Ignoring exceptions.
  • Using == instead of .equals() for string comparison.
  • Creating unnecessary objects.

Q8: [Deloitte] What is SonarQube in Java?

Answer: SonarQube is a tool for code quality analysis and identifying vulnerabilities.


Q9: [JP Morgan] Why should you avoid using System.out.println() in production code?

Answer: It affects performance; use a logging framework instead.


Q10: [Goldman Sachs] What are Java code smells?

Answer: Bad code practices that indicate design problems (e.g., God Object, Long Methods).