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Q:

Can a source file contain more than one class declaration?

Answer Yes a single source file can contain any number of Class declarations but only one of the class can be declared as public.
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Subject: Java

Q:

Does the order of public and static declaration matter in main() method?

Answer No. It doesn't matter but void should always come before main().
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Subject: Java

Q:

Can a main() method be declared final?

Answer Yes. Any inheriting class will not be able to have it's own default main() method.
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Subject: Java

Q:

What is the argument of main() method?

Answer main() method accepts an array of String object as arguement.
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Subject: Java

Q:

Should a main() method be compulsorily declared in all java classes?

Answer No not required. main() method should be defined only if the source class is a java application.
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Subject: Java

Q:

What is the return type of the main() method?

Answer Main() method doesn't return anything hence declared void.
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Subject: Java

Q:

Why is the main() method declared static?

Answer

main() method is called by the JVM even before the instantiation of the class, hence it is declared as static.

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Subject: Java

Q:

Are arrays primitive data types?

Answer In Java, Arrays are objects.
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Subject: Java