Chapter 6. Using Java from Jython
This chapter covers the use of Java classes from Jython code. From Jython, you have access to all the Java classes in all standard libraries, any third-party libraries, and, of course, your own Java code. Jython leverages Python’s object-oriented structures and support to integrate smoothly with Java.
Basic Object Usage
In Importing Java Classes in Chapter 4, we showed how you can retrieve Java
classes using the
import statement. The Jython
runtime wraps both Java classes and instances inside proxy objects,
which offer a natural and intuitive mix between what you expect from
Java semantics and what you have learned so far about user-defined
Python classes. Using these objects, Jython provides a number of
automatic conversions when passing objects back and forth between Jython
and Java code.
When using a Java class in Jython, you can, by default, access all
inner classes, static fields, static methods, and instance methods—as
long as they are defined as
public. If you need to
get access to protected or private members, you can set the Jython
false, an option used mainly for testing. The following code
shows how you can import and then use Java classes and methods from the
>>> from java.lang import System >>> System.out.println("print would be more pythonic") print would be more pythonic
You construct Java instances the same way you construct Python instances, by calling the class ...