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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:

How to define a constant variable in Java?

Answer The variable should be declared as static and final. So only one copy of the variable exists for all instances of the class and the value can't be changed also.
static final int PI = 2.14; is an example for constant.
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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 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:

Is Java a pure object oriented language?

Answer

Java uses primitive data types and hence is not a pure object oriented language.

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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:

Does Java support multiple inheritance?

Answer Java doesn't support multiple inheritance.
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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