I would actually recommend taking a look at maven.
It is a tool that helps you manage your builds, dependencies, ...
This way if you ever want to check your code into a source code repository you don't need to also commit your jar files, and it makes it much easier to update your files.
Quick sample:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.kanescharles.iniProject</groupId>
<artifactId>iniProject</artifactId>
<packaging>war</packaging>
<version>1.0-SNAPSHOT</version>
<name>iniTest</name>
<url>http://www.kanecharles.com/iniTest</url>
<build>
<finalName>iniTest</finalName>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>org.ini4j</groupId>
<artifactId>ini4j</artifactId>
<version>0.5.2</version>
</dependency>
</dependencies>
</project>
For Eclipse you have the m2eclipse plugin, and if you want to look up dependencies I would recommend mvnRepository