Servlet NewJavaServlet Test

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 CONTENTS  
 
viii 
Summary ....................................................................................................................................... 112


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Chapter 6: Object-Oriented Jython .............................................................................................113 
Basic Syntax .................................................................................................................................. 113


Object Attribute Lookups ................................................................................................................ 117


Inheritance and Overloading........................................................................................................... 119


Underscore Methods ...................................................................................................................... 121


Protocols........................................................................................................................................ 123


Default Arguments ......................................................................................................................... 127


Runtime Binding of Methods .......................................................................................................... 128


Caching Attribute Access ............................................................................................................... 128


Summary ....................................................................................................................................... 131


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Chapter 7: Exception Handling and Debugging..........................................................................133 
Exception Handling Syntax and Differences with Java .................................................................... 133


Catching Exceptions................................................................................................................... 134


Raising Exceptions..................................................................................................................... 142


Defining Your Own Exceptions........................................................................................................ 143


Issuing Warnings ........................................................................................................................... 143


Assertions and Debugging.............................................................................................................. 148


Context Managers.......................................................................................................................... 148


Summary ....................................................................................................................................... 150


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Chapter 8: Modules and Packages for Code Reuse ...................................................................151 
Imports for Reuse .......................................................................................................................... 151


Import Basics............................................................................................................................. 151


breakfast.py........................................................................................................................... 151


The Import Statement ................................................................................................................ 153


An Example Program...................................................................................................................... 153


greetings.py........................................................................................................................... 154


greet/__init__.py................................................................................................................... 154


greet/hello.py......................................................................................................................... 154


greet/people.py...................................................................................................................... 154


Trying Out the Example Code ..................................................................................................... 154


Types of Import Statements ........................................................................................................... 155


From Import Statements ............................................................................................................ 155


Relative Import Statements ........................................................................................................ 156


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 CONTENTS  
 
 
 
ix 
Aliasing Import Statements ........................................................................................................ 156


Hiding Module Names ................................................................................................................ 157


Module Search Path, Compilation, and Loading.............................................................................. 157


Java Import Example ................................................................................................................. 157


Module Search Path and Loading............................................................................................... 158


Java Package Scanning ................................................................................................................. 158


How Jython Finds the Jars and Classes to Scan ......................................................................... 159


Compilation ............................................................................................................................... 160


Python Modules and Packages versus Java Packages.................................................................... 160


sys.path..................................................................................................................................... 160


Naming Python Modules and Packages...................................................................................... 160


Proper Python Naming ............................................................................................................... 161


Advanced Import Manipulation ....................................................................................................... 161


Import Hooks ............................................................................................................................. 161


sys.path_hooks.......................................................................................................................... 161


sys.meta_path ........................................................................................................................... 162


Summary ....................................................................................................................................... 162


Part II: Using the Language .............................................................................................................163 
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Chapter 9: Scripting With Jython................................................................................................165 
Getting the Arguments Passed to a Script ...................................................................................... 165


Searching for a File ........................................................................................................................ 166


Manipulating Files.......................................................................................................................... 167


Making a Script a Module .............................................................................................................. 168


Parsing Commandline Options ....................................................................................................... 169


Compiling Java Source................................................................................................................... 170


Example Script: Builder.py ............................................................................................................. 170


HelloWorld.java .............................................................................................................................. 172


Summary ....................................................................................................................................... 173


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Chapter 10: Jython and Java Integration ...................................................................................175 
Using Java Within Jython Applications ........................................................................................... 175


Using Jython Within Java Applications ........................................................................................... 178


Object Factories......................................................................................................................... 179


One-to-One Jython Object Factories ...................................................................................... 179


Summary of One-to-One Object Factory................................................................................. 182


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