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Java developers benefit from using Groovy, but so can you who don't already know Java. If you want to access the power of the Java Virtual Machine and Development Kit libraries when programming, but don't want to learn the Java Language, you can use Groovy instead. Or maybe you do want to learn Java, but do so the easy way: you can learn Groovy first. You'll be productive sooner, and can go on to learn more about Java at your own pace.

Much of the documentation on this website at Codehaus is for those who already know Java. These pages are for you who don't, so you can learn enough of the Groovy basics to easily use the other documentation on this website. They introduce Groovy's core classes and syntax together. All code examples have been tested using Groovy 1.0 or later inside a script. It's aimed at you who have already programmed before, just not in Java, maybe in PHP, Perl, or Visual Basic. Do note that although this documentation is correct and detailed, it's still a little raw because it's still being written.

<a href="http://groovy.codehaus.org/JN0025-Starting">Getting Started</a> - enough background to dive into the tutorials that follow

1. Numeric Processing 
    <a href="http://groovy.codehaus.org/JN0515-Integers">Integer Math</a> - choose from many types of integers

<a href="http://groovy.codehaus.org/JN0525-Decimals">Decimal Math</a> - for high-precision decimal math

<a href="http://groovy.codehaus.org/JN0535-Floats">Floating Point Math</a> - for high-speed decimal math

<a href="http://groovy.codehaus.org/JN0545-Dates">Dates and Times</a> - enabling complex date manipulations

2. Collections 
    <a href="http://groovy.codehaus.org/JN1015-Collections">Lists and Sets</a> - group various items into a collection

<a href="http://groovy.codehaus.org/JN1025-Arrays">Arrays</a> - fixed-size arrays for faster collections

<a href="http://groovy.codehaus.org/JN1035-Maps">Maps</a> - assign collected values to keys

3. Text Processing 
    <a href="http://groovy.codehaus.org/JN1515-Characters">Characters</a> - access the full power of Unicode

<a href="http://groovy.codehaus.org/JN1525-Strings">Strings</a> - easily handle strings of characters

<a href="http://groovy.codehaus.org/JN1535-Patterns">String Pattern Matching</a> - find patterns within strings

4. Input and Output 
    <a href="http://groovy.codehaus.org/JN2015-Files">Files</a> - manipulate the file system easily

<a href="http://groovy.codehaus.org/JN2025-Streams">Streams, Readers, and Writers</a> - access data as a flow of information

5. Control Structures 
    <a href="http://groovy.codehaus.org/JN2515-Closures">Blocks, Closures, and Functions</a> - compose programs from many building blocks

<a href="http://groovy.codehaus.org/JN2525-Classes">Expandos, Classes, and Categories</a> - encapsulate program complexity

<a href="http://groovy.codehaus.org/JN2535-Control">Program Control</a> - various ways to structure program logic

6. Data Typing 
    <a href="http://groovy.codehaus.org/JN3015-Types">Static Typing and Interfaces</a> - put compile-time restrictions in programs

<a href="http://groovy.codehaus.org/JN3025-Inheritance">Inheritance</a> - use classes and methods for many purposes

<a href="http://groovy.codehaus.org/JN3035-Exceptions">Exceptions</a> - handle exception and error conditions simply

7. Meta-Programming 
    <a href="http://groovy.codehaus.org/JN3515-Interception">Interceptors</a> - intercept method calls

<a href="http://groovy.codehaus.org/JN3525-MetaClasses">MetaClasses</a> - add and modify behavior of objects

<a href="http://groovy.codehaus.org/JN3535-Reflection">Class Reflection</a> - examine and manipulate objects dynamically - IN PROGRESS

Other Topics Coming 
    Packages 
    Multi-Threading 
    Networking 
    Internationalization 
    Annotations 
    Enums 
    Builders 
    Class Loading 
    Permissions

To continue learning Groovy, you can now go on to: 
    <a href="http://java.sun.com">Java</a>, the engine behind Groovy's power and performance 
    <a href="http://java.sun.com/docs/books/tutorial/uiswing/index.html">Swing</a>, the graphical interface for Java, made easy with Groovy's own <a href="http://groovy.codehaus.org/Swing+Builder">SwingBuilder</a> 
    <a href="http://www.eclipse.org">Eclipse</a>, the free IDE with a <a href="http://groovy.codehaus.org/Eclipse+Plugin">Groovy plugin</a> to make managing your code easy 
    <a href="http://groovy.codehaus.org/Modules">useful Groovy modules</a>, such as <a href="http://groovy.codehaus.org/Gant">Gant</a>, which extend the Groovy system 
    <a href="http://www.grails.org">Grails</a>, bringing the power of Groovy to website development and deployment