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Home :: Java :: Tips and Tutorials :: General Java :: Frequently Asked Questions

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Java Examples - Learn Java Programming by Examples

	Kode Java website provides beginners to Java programming some examples of how to use the Java API (Application Programming Interface) to develop an application. Learning by following some examples will hopefully decrease the amount of time needed to begin to code in Java.
Free Version: n/a Platform(s): linux, windows, freebsd, osx, sun Updated: Wed Aug 22 2007

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What is Polymorphism

	Polymorphism means any forms. In OOPS, it refers to the capability of objects to react differently to the same method. Polymorphism can be implemented in the Java language in the form of multiple methods having the same name. Java code uses a late-binding technique to support polymorphism; the method to be invoked is decided at runtime.
Free Version: 1.0.0 Platform(s): linux, windows, sun Updated: Thu May 24 2007

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Difference between HashMap and HashTable

	Both provide key-value access to data. The Hashtable is one of the original collection classes in Java. HashMap is part of the new Collections Framework, added with Java 2, v1.2. The key difference between the two is that access to the Hashtable is synchronized on the table while access to the HashMap isn't. You can add it, but it isn't there by default.
Free Version: 1.0.0 Platform(s): linux, windows, sun Updated: Thu May 24 2007

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Explain garbage collection

Garbage collection is one of the most important feature of Java. Garbage collection is also called automatic memory management as JVM automatically removes the unused variables/objects (value is null) from the memory. User program can’t directly free the object from memory, instead it is the job of the garbage collector to automatically free the objects that are no longer referenced by a program.

Free Version: 1.0.0 Platform(s): linux, windows, sun Updated: Thu May 24 2007

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What is the difference between JDK and JRE

	The "JDK" is the Java Development Kit. i.e., the JDK is bundle of software that you can use to develop Java based software. The "JRE" is the Java Runtime Environment. i.e., the JRE is an implementation of the Java Virtual Machine which actually executes Java programs.
Free Version: 1.0.0 Platform(s): linux, windows, sun Updated: Thu May 24 2007

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What do you understand by Synchronization

Synchronization is a process of controlling the access of shared resources by the multiple threads in such a manner that only one thread can access one resource at a time. In non synchronized multithreaded application, it is possible for one thread to modify a shared object while another thread is in the process of using or updating the object's value. Synchronization prevents such type of data corruption.

Free Version: 1.0.0 Platform(s): linux, windows, sun Updated: Thu May 24 2007

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What is Object Serialization

	Serialization is a way of flattening, pickling, sizzling, serializing, or freeze-drying Objects so that they can be stored on disk, and later read back and reconstituted, with all the links between Objects intact Object serialization is the process of saving an object's state to a sequence of bytes, as well as the process of rebuilding those bytes into a live object at some future time
Free Version: 1.0.0 Platform(s): linux, windows, freebsd, osx, sun Updated: Thu May 17 2007

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.NET and J2EE - A Comparsion Study

	This tutorial compares .NET and J2EE, discussing various features of both the technolgoies and summarising when and where these technologies are suitable to use for entriprise application.
Free Version: n/a Platform(s): linux, windows, freebsd, osx, sun Updated: Sun Jun 4 2006

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Java Interview Questions

Java Interview Questions: Get the Interview Questions and Frequently Asked Questions in Java related Technologies. Over 1000 Questions and Answers in J2EE subjects like Java Interview Questions, JDBC Interview Questions, EJB Interview Questions, Struts Interview Questions, JMS Interview Questions, JSP Interview Questions, Servlets Interview Questions, Core Java Interview Questions and OOPS Interview Questions. Discuss each Question in detail and prepare for your Interview.

Free Version: n/a Platform(s): linux, windows, freebsd, osx, sun Updated: Mon Aug 29 2005

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JDK More Flexible, Scalable Locking

Multithreading and concurrency are nothing new, but one of the innovations of the Java language design was that it was the first mainstream programming language to incorporate a cross-platform threading model and formal memory model directly into the language specification. While this simplifies the development of platform-independent concurrent classes, it by no means makes writing concurrent classes trivial -- just easier.

Version: n/a Platform(s): n/a Updated: Tue Nov 23 2004

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Java Q & A

	Here are a selection of common questions and answers about Java programming. Question categories are grouped by Applets, AWT / Graphics, I/O & Files, Language questions, Data type issues, Keywords, Operators, Networking, Java.util package and more.
Version: n/a Platform(s): n/a Updated: Tue Sep 21 1999

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Java Programmer's FAQ

	The Java FAQs here are intended for people who already have some programming experience, though maybe not in the JavaTM programming language.
Version: n/a Platform(s): n/a Updated: Tue Sep 21 1999

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