main() Method in Java Interview Questions and Answers for 5 years experience

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Java main() Method Interview Questions

  1. What is the main() method in Java?

    • Answer: The main() method is the entry point of execution for a Java program. The Java Virtual Machine (JVM) starts execution from the main() method. It's where the program's logic begins.

  2. What is the signature of the main() method?

    • Answer: public static void main(String[] args). public means it's accessible from anywhere. static allows it to be called without creating an object. void indicates it doesn't return a value. String[] args provides an array of command-line arguments.

  3. Can the main() method be overloaded?

    • Answer: Yes, you can have multiple methods with the name `main`, but only one with the exact signature public static void main(String[] args) will be considered the entry point by the JVM. Others will be treated as regular methods.

  4. Can the main() method be private?

    • Answer: No. The JVM requires the main method to be public. A private main method will prevent the JVM from locating and executing the application.

  5. Can the main() method be final?

    • Answer: Yes, the main method can be declared as `final`, preventing it from being overridden in subclasses. This is generally not a common practice.

  6. Can the main() method be abstract?

    • Answer: No. Abstract methods require implementation in subclasses, but the main method must have a concrete implementation to serve as the entry point.

  7. Can the main() method be synchronized?

    • Answer: Yes, but it's usually unnecessary unless you have specific thread synchronization needs within the main method itself.

  8. Can the main() method throw exceptions?

    • Answer: Yes, you can declare that the main method throws exceptions using a `throws` clause. For example: public static void main(String[] args) throws Exception {}. However, it's generally better to handle exceptions within the main method.

  9. What is the purpose of the String[] args parameter?

    • Answer: This parameter allows you to pass command-line arguments to your Java program. Each argument is a string, and they are stored in the array. You can access them using their index (e.g., args[0]).

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