Programming Clojure, 2nd Edition

Creating Java Classes in Clojure

Clojure’s objects all implement reasonable Java interfaces:

• Clojure functions implement interfaces from Runnable and Callable.
• Clojure data structures implement the Java Collections API.

In addition to these generic interfaces, you will occasionally need domain-specific interfaces. Often this comes in the form of callback handlers for event-driven APIs such as Swing or some XML parsers. Clojure can easily generate one-off proxies or classes on disk when needed, using a fraction of the lines of code necessary in Java.

Creating Java Proxies

To interoperate with Java, you will often need to implement Java interfaces. A good example is parsing XML with a Simple API for XML (SAX) parser. To get ready for this example, ...