Windows command prompt basics commands like ping, telnet, dir, cd, ipconfig and tools like Task Manager, Services, Registry.

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How to prepare a Windows Java Development Machine using Eclipse, NetBeans, Ant, Maven, MySQL, MongoDB, GIT, SVN.

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In a application you can have resources that are limited or time consuming to create a new one. e.g. a connection to a database, a new thread. A solution is to create a the limited resource once and reuse it. To address this problem the object pool pattern was introduced. The object pool design will have the mechanism to create a new object to keep the objects and to destroy the objects if necessary.

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