main() Method in Java Interview Questions and Answers for freshers

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 executing a program by calling the main() method. Without a main() method with the correct signature, a Java program cannot run.

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

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

3. Can the main() method be private?

   • Answer: No, the main() method cannot be private. The JVM needs to access it, and private methods are only accessible within the same class.

4. Can the main() method be final?

   • Answer: Yes, the main() method can be declared as final, preventing it from being overridden in subclasses.

5. Can the main() method be abstract?

   • Answer: No, the main() method cannot be abstract because the JVM needs a concrete implementation to execute the program.

6. Can the main() method be synchronized?

   • Answer: Yes, the main() method can be synchronized, although it's rarely necessary unless you are dealing with multi-threaded access to shared resources within the main() method itself.

7. Can the main() method throw an exception?

   • Answer: Yes, the main() method can declare that it throws exceptions using a throws clause. For example: public static void main(String[] args) throws Exception { ... }

8. What is the purpose of the String[] args parameter in main()?

   • Answer: The String[] args parameter allows you to pass command-line arguments to your Java program. Each argument is a string, and they are stored in the array.

9. How do you access command-line arguments?

   • Answer: You access command-line arguments using the elements of the args array. For example, args[0] would be the first argument, args[1] the second, and so on.

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