Languages-Java [3i Infotech Placement]: Sample Questions 139 - 139 of 141

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Question 139

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Essay▾

What are JVM, JRE, J2EE, and JNI?

Explanation

JVM:

  • Java virtual machine is an abstract machine.
  • Specification providing runtime environment in which java byecode can executed.
  • Available for many hardware and software platforms.

Perform following main tasks:

The Main Tasks

JRE:

  • Acronym for java runtime environment.
  • Implementation of JVM which physically exists.
  • Contains libraries other files JVM uses at runtime.
  • Implementation of JVMs is released by other companies besides Sun Micro Systems.

J2EE:

  • J2EE plate form describes the J2EE application model and best practices for using the J2EE plateform.
  • Application model provides a simplified approach to developing highly scalable and available applications.
  • Application model encapsulates the layer of functionality in specific types of components.
  • J2EE components provide competitive choices for enterprise developers and IT organizations.

JNI:

Understanding of JNI
  • Java native programming interface is part of the java software development kit.
  • Provides code and code libraries written in other languages as C and C ++ .
  • JNI enables embedding a java virtual machine into native applications.
  • Allows programmers to call java code from within native code.

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