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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:

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

Q:

What is the difference between a JDK and a JVM?

Answer

JDK is Java Development Kit which is for development purpose and it includes execution environment also.


JVM is Java Virtual Machine which is a run time environment for the compiled java class files .Hence you will not be able to compile your source files using a JVM.

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Subject: Java

Q:

What is the most important feature of Java?

Answer Java is a platform independent language.
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Subject: Java