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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:

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

Q:

What are instance variables?

Answer Instance variables are those which are defined at the class level. Instance variables need not be initialized before using them as they are automatically initialized to their default values.
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Subject: Java

Q:

Are arrays primitive data types?

Answer In Java, Arrays are objects.
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Subject: Java

Q:

What is difference between Path and Classpath?

Answer

PATH and CLASSPATH are operating system level environment variables. PATH is used to define where the system can find the executables (.exe) files whereas CLASSPATH is used to specify the location of .class files.

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Subject: Java

Q:

What do you mean by platform independence?

Answer

Platform independence means that we can write and compile the java code in one platform (Eg Windows) and can execute the class in any other supported platform (Eg Linux,Solaris,etc).

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Subject: Java