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Q:

I want to print "Hello" even before main() is executed. How will you acheive that?

Answer Print the statement inside a static block of code. Static blocks get executed when the class gets loaded into the memory and even before the creation of an object. Hence it will be executed before the main() method. And it will be executed only once.
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Subject: Java

Q:

I do not want my class to be inherited by any other class. What should i do?

Answer You should declared your class as final. But you can't define your class as final, if it is an abstract class. A class declared as final can't be extended by any other class.
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Subject: Java

Q:

What is the impact of declaring a method as final?

Answer A method declared as final can't be overridden. A sub-class can't have the same method signature with a different implementation.
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Subject: Java

Q:

What is the purpose of declaring a variable as final?

Answer A final variable's value can't be changed. final variables should be initialized before using them.
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Subject: Java

Q:

What is the access scope of a protected method?

Answer A protected method can be accessed by the classes within the same package or by the subclasses of the class in any package.
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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:

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:

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