Interview Questions Java


1. What do you know about Java?
Java is a high-level programming language originally developed by Sun Microsystems and released in 1995. Java runs on a variety of platforms, such as Windows, Mac OS, and the various versions of UNIX.

2. What if the main method is declared as private?
The program compiles properly but at runtime it will give ?Main method not public.? message.

3. What are the important features of Java 8 release?
Java 8 has been released in March 2014, so it?s one of the hot topic in java interview questions. If you answer this question clearly, it will show that you like to keep yourself up-to-date with the latest technologies.
Java 8 has been one of the biggest release after Java 5 annotations and generics. Some of the important features of Java 8 are:
A. Interface changes with default and static methods
B. Functional interfaces and Lambda Expressions
C. Java Stream API for collection classes
D. Java Date Time API

4. What are the supported platforms by Java Programming Language?
Java runs on a variety of platforms, such as Windows, Mac OS, and the various versions of UNIX/Linux like HP-Unix, Sun Solaris, Redhat Linux, Ubuntu, CentOS, etc.

5. List any five features of Java?
Some features include Object Oriented, Platform Independent, Robust, Interpreted, Multi-threaded

6. Why is Java Architectural Neutral?
It?s compiler generates an architecture-neutral object file format, which makes the compiled code to be executable on many processors, with the presence of Java runtime system.

7. How Java enabled High Performance?
Java uses Just-In-Time compiler to enable high performance. Just-In-Time compiler is a program that turns Java bytecode, which is a program that contains instructions that must be interpreted into instructions that can be sent directly to the processor.

8. What Java is considered dynamic?
It is designed to adapt to an evolving environment. Java programs can carry extensive amount of run-time information that can be used to verify and resolve accesses to objects on run-time.

9. What is Java Virtual Machine and how it is considered in context of Java?s platform independent feature?
When Java is compiled, it is not compiled into platform specific machine, rather into platform independent byte code. This byte code is distributed over the web and interpreted by virtual Machine (JVM) on whichever platform it is being run

10. List two Java IDE?s?
Netbeans, Eclipse, etc.