如何在 Processing 中导入外部库？

Question

I tried to import commons-io-2.6.jar and commons-lang-2.6.jar (Availablehere ) into a Processing sketch.

I put these jars in the libraries folder located at the root of my Processing, but Processing didn't recognize my imports:

import commons-lang-2.6;
import commons-io-2.6;

How do I import an external jar like Apache in Processing?

Answer 1

These import statements don't look valid to me:

import commons-lang-2.6;
import commons-io-2.6;

Import statements should reference packages or class names, not jar files. You probably want something like this:

import org.apache.commons.lang3.StringUtils;

With this import statement, you could then use the StringUtils class in your sketch.

By the way, the easiest way to add a jar file to a sketch is to drag it onto the Processing editor directly. Processing handles putting the file in the right place for you, so you don't have to manually do it. Shameless self-promotion: here is a tutorial on using libraries in Processing.