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javaeclipseclasspathapache-commons

How to import org.apache.commons.lang.time.StopWatch in my Eclipse Java project?

How to use StopWatch from apache commons? What do I download/install to use this class in my project?

Solution

  • If you have no build system such as Ant, Maven e.t.c. In Eclipse you should use: Project properties -> Java Build Path -> Libraries -> Add External Jar -> Choose Downloaded Apache Common Jar. This option will add your jar to the project's classpath. It means Java compiler and JVM know where find classes when you reference this class in your code. It will not additional cost in runtime if you have giant jar file because will load only those classes need to executing code(all you refer from your code and referred by library code).

    Also, you may download sources file to attach for jar in IDE. After you are able to look library source code and javadoc in your IDE.

    Also, you may consider Guava stopwatch implementation if you already have this one in your classpath.