Java Interview Questions - Set 2: Core Principles

If you are fresher, then the core principles of Java is one of the favorite question that an interview may start your technical interview. Below is the list of questions that you should be able to answer.

Question 1: List the core principles on which Java is based

Answer:

1. Simple.
2. Robust.
3. Secure.
4. Architecture-Neutral.
5. Portable.
6. High Performance.
7. Interpreted.
8. Multi-Threaded.
9. Dynamic.

Question 2: Explain how Java is Simple?

Answer: Java has a straightforward syntax, making it easy to learn and write code efficiently. Java avoids complex features present in languages like C and C++ such as explicit pointers and operator overloading.

Question 3: What makes Java a Robust Language?

Answer: Java provides automatic memory management, this reducing the risk of memory leaks and other issues by not providing direct access to pointers.

Question 4: Explain how Java is Secure?

Answer: The Java's bytecode runs on the Java Virtual Machine (JVM) as a sandbox and implements a robust access control mechanism to protect against unauthorized access.

Question 5: Explain how Java is Architecture-Neutral?

Answer: The Java code (.java file) is compiled into bytecode, which can run on any device with a Java Virtual Machine (JVM), regardless of the underlying architecture which makes it Architecture-Neutral.

Question 6: Explain how Java is Portable?

Answer:

The Java's "Write Once, Run Anywhere" (WORA) principle allows compiled code to run on any device with a compatible JVM making it portable.

Question 7: What makes Java a high performance language?

Answer: JIT (Just-in-Time) compilation, efficient garbage collection algorithms and memory management makes java a high performance language.

Question 8: Why is Java called an Interpreted language?

Answer:

The Java code (.java file) is first compiled into an intermediate bytecode (.class file) and interpreted by the JVM at runtime for greater flexibility and adaptability.

Question 9: Explain why Java is Multi-Threaded?

Answer:

Java provides built-in support for multi-threading to efficiently handle concurrent execution, enabling parallel processing of tasks thus enhancing performance, and improving responsiveness in applications.

Question 10: What makes Java Dynamic programming language?

Answer: Java is called to be a dynamic programming language due to its support for dynamic memory allocation, allowing flexible object creation, and features like reflection that enable inspecting and modifying code at runtime.