Java Interview Questions - 1

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This document contains 30 questions related to important Java concepts: 1. It asks about platform independence, the JVM, differences between the JDK and JVM, object-oriented features like inheritance and encapsulation, primitive vs reference types, scoping rules, packages and access modifiers. 2. Questions range from basic Java keywords and syntax like main methods, final variables and methods to more advanced topics such as multiple inheritance, packages and class access levels. 3. The document covers core Java concepts and is a good reference for a beginner or intermediate Java developer to test their knowledge.

JAVA QUESTIONS 1
1. What is the most important feature of Java?
2. What do you mean by platform independence?
3. What is a JVM?
4. Are JVM's platform independent?
5. What is the difference between a JDK and a JVM?
6. What is a pointer and does Java support pointers?
7. What is the base class of all classes?
8. Does Java support multiple inheritance?
9. Is Java a pure object oriented language?
10.Are arrays primitive data types?
11.What are local variables?
12.What is difference between Path and Classpath?
13.What are instance variables?
14.How to define a constant variable in Java?
15.Should a main() method be compulsorily declared in all java classes?
16.What is the return type of the main() method?
17.Why is the main() method declared static?
18.What is the arguement of main() method?
19.Can a main() method be overloaded?
20.Can a main() method be declared final?
21.Does the order of public and static declaration matter in main() method?
22.Can a source file contain more than one class declaration?
23.What is a package?
24.Which package is imported by default?
25.Can a class declared as private be accessed outside it's package?
26.Can a class be declared as protected?
27.What is the access scope of a protected method?
28.What is the purpose of declaring a variable as final?
29.What is the impact of declaring a method as final?
30.I don't want my class to be inherited by any other class. What should i do?

This document contains 30 questions about Java concepts including: - Transient variables, border layout containers, and why threads block on I/O. - How Observer and Observable are used and what synchronization is/why it's important. - Changes to stop(), suspend(), and resume() methods in JDK 1.2 and if null is a keyword. - Default component size, container layout specification, FlowLayout containers, and thread termination state. - The Collections API, valid identifier characters, and the List interface. - Integer overflow/underflow handling, the Vector class, and inner class modifiers. - The Iterator interface, difference between >> and >>> operators, and Component set position/size method

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Java Interview Questions - 1

1. JAVA QUESTIONS 1 1. What is the most important feature of Java? 2. What do you mean by platform independence? 3. What is a JVM? 4. Are JVM's platform independent? 5. What is the difference between a JDK and a JVM? 6. What is a pointer and does Java support pointers? 7. What is the base class of all classes? 8. Does Java support multiple inheritance? 9. Is Java a pure object oriented language? 10.Are arrays primitive data types? 11.What are local variables? 12.What is difference between Path and Classpath? 13.What are instance variables? 14.How to define a constant variable in Java? 15.Should a main() method be compulsorily declared in all java classes? 16.What is the return type of the main() method? 17.Why is the main() method declared static? 18.What is the arguement of main() method? 19.Can a main() method be overloaded? 20.Can a main() method be declared final? 21.Does the order of public and static declaration matter in main() method? 22.Can a source file contain more than one class declaration? 23.What is a package? 24.Which package is imported by default? 25.Can a class declared as private be accessed outside it's package? 26.Can a class be declared as protected? 27.What is the access scope of a protected method? 28.What is the purpose of declaring a variable as final? 29.What is the impact of declaring a method as final? 30.I don't want my class to be inherited by any other class. What should i do?

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