Java Interview Q&A

Java Interview Q&A

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Java is a programming language originally developed by James Gosling at Sun Microsystems (now part of Oracle Corporation) and released in 1995 as a core component of Sun Microsystems' Java platform. The language derives much of its syntax from C and C++ but has a simpler object model and fewer low-level facilities. Java applications are typically compiled to bytecode (class file) that can run on any Java Virtual Machine (JVM) regardless of computer architecture. Java is a general-purpose, concurrent, class-based, object-oriented language that is specifically designed to have as few implementation dependencies as possible. It is intended to let application developers "write once, run anywhere." Java is currently one of the most popular programming languages in use, particularly for client-server web applications.

One characteristic of Java is portability, which means that computer programs written in the Java language must run similarly on any hardware/operating-system platform. This is achieved by compiling the Java language code to an intermediate representation called Java bytecode, instead of directly to platform-specific machine code. Java bytecode instructions are analogous to machine code, but are intended to be interpreted by a virtual machine (VM) written specifically for the host hardware. End-users commonly use a Java Runtime Environment (JRE) installed on their own machine for standalone Java applications, or in a Web browser for Java applets.

Standardized libraries provide a generic way to access host-specific features such as graphics, threading, and networking.

A major benefit of using bytecode is porting. However, the overhead of interpretation means that interpreted programs almost always run more slowly than programs compiled to native executables would. Just-in-Time compilers were introduced from an early stage that compile bytecodes to machine code during runtime.

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Limited Trail version has been removed, You can read full version now. Covering interview questions and answers on all the topics. No more Limited version.

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Comments and ratings for Java Interview Q&A
  • (58 stars)

    by Jason sutter on 02/12/2013

    Sounds pretty cool....

  • (58 stars)

    by Paul Mirkovich on 02/12/2013

    I like to learn through this

  • (58 stars)

    by Serge Hunanyan on 24/11/2013

    Useful application

  • (58 stars)

    by Rajashekar Reddy on 11/11/2013

    Y u ned excess permissions

  • (58 stars)

    by Rashid Hussain on 29/10/2013

    Why you need permissions to access my phone status and my gps location??? Please explain.

  • (58 stars)

    by Mukesh Ahirwar on 23/10/2013

    Mast h

  • (58 stars)

    by siddhesh Markad on 06/10/2013

    Good