#Manually compiling java code code#
But to be useful, that code needs to be organized in such a way that the Java programmer can access the components to solve the problem at hand. What is a library?Ī library, of course, must contain some useful code. But first, I'll review the important bits and pieces of a library. This article looks at using such an interface to connect to a PostgreSQL database and get some interesting information.
For example, Apache Commons "is an Apache project focused on all aspects of reusable Java components" and provides a collection of some 43 open source libraries (as of this writing) covering a range of capabilities either outside the Java core (such as geometry or statistics) or that enhance or replace capabilities in the Java core (such as math or numbers).Īnother common type of Java library is an interface to a system component-for example, to a database system. Given the richness of this core set of libraries, it's often easy to find the necessary bits and pieces to reduce the amount of code a programmer must write to solve a problem.Įven so, there are a lot of interesting Java libraries created by people who find gaps in the core libraries. Java comes with a core set of libraries, including those that define commonly used data types and related behavior, like String or Date utilities to interact with the host operating system, such as System or File and useful subsystems to manage security, deal with network communications, and create or parse XML.
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