java
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jMonkeyEngine-wiki
镜像来自 https://github.com/jMonkeyEngine/wiki.git


			
				
					
						
						
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<body class="article toc2 toc-left">
<div id="header">
<h1>What&#8217;s an IDE?</h1>
<div id="toc" class="toc2">
<div id="toctitle">Table of Contents</div>
<ul class="sectlevel1">
<li><a href="#the-past-a-world-without-ides">The Past: A World Without IDEs</a></li>
<li><a href="#the-present-the-world-with-ides">The Present: The world with IDEs</a></li>
<li><a href="#your-future-a-world-with-jmonkeyengine-sdk">Your Future: A World With jMonkeyEngine SDK</a></li>
</ul>
</div>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p>IDE stands for Integrated Development Environment. It&#8217;s a software tool for developers.</p>
</li>
<li>
<p>NetBeans IDE, Eclipse, IntelliJ are examples of development environments (=IDEs) for developers who are writing Java applications.</p>
</li>
<li>
<p>Java is a programming language.</p>
<div class="ulist">
<ul>
<li>
<p>“Java Beans is just a funny way of naming a certain type of data object that you can write in Java.<br>
(Java = coffee… coffee beans, get it? No, developers aren’t very funny.)<br>
<em>Java Beans have nothing to do with this topic or NetBeans!</em></p>
</li>
</ul>
</div>
</li>
<li>
<p>jMonkeyEngine is a game engine written in Java. You use it by putting a JAR library on the class path, and calling its <abbr title="Application Programming Interface">API</abbr> from your Java code.</p>
</li>
<li>
<p>The jMonkeyEngine <a href="sdk.html">SDK</a> (Software Development Kit) is a customized NetBeans IDE that has special tools that help you develop 3D Java games.</p>
</li>
</ul>
</div>
<div class="imageblock" style="text-align: center">
<div class="content">
<img src="images/sdk/jme3-jmonkeyplatform.png" alt="jme3-jmonkeyplatform.png" height="400">
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="the-past-a-world-without-ides">The Past: A World Without IDEs</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Let&#8217;s say you have no IDE. The typical stuff that you need for game development is:</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Install the Java SDK (“JDK 6) from Sun/Oracle.</p>
<div class="ulist">
<ul>
<li>
<p>The JDK includes essential development tools, such as the Java compiler (<code>javac</code>) and Java runtime (<code>java</code>).</p>
</li>
</ul>
</div>
</li>
<li>
<p>Install the jMonkeyEngine JAR libraries.</p>
<div class="ulist">
<ul>
<li>
<p>These libraries include the special classes that you need for game development.</p>
</li>
<li>
<p>As with all Java applications, you put JAR libraries on the classpath. (<code>java -cp “bla.jar;foo.jar myapp</code>…)</p>
</li>
</ul>
</div>
</li>
<li>
<p>Get a text editor to write .java and .xml files.</p>
</li>
<li>
<p>Get a 3D model editor to preview 3D models and arrange them in scenes.</p>
</li>
<li>
<p>Create Java project:</p>
<div class="olist loweralpha">
<ol class="loweralpha" type="a">
<li>
<p>create directories for Java packages,</p>
</li>
<li>
<p>create more directories for textures and sound files and 3D models,</p>
</li>
<li>
<p>write an Ant build script,</p>
</li>
<li>
<p>move JAR files around and check the classpath…</p>
</li>
</ol>
</div>
</li>
<li>
<p>Write code:</p>
<div class="olist loweralpha">
<ol class="loweralpha" type="a">
<li>
<p>write code in text editor,</p>
</li>
<li>
<p>look up javadoc in the web browser,</p>
</li>
<li>
<p>compile and then run code in the terminal,</p>
</li>
<li>
<p>when you get error output in the terminal, go find the file and line back in text editor…</p>
</li>
</ol>
</div>
</li>
<li>
<p>Repeat.</p>
</li>
</ol>
</div>
<div class="paragraph">
<p>Basically, you switch back and forth between terminal, 3D model editor, web browser, and text editor a lot. You have to repeat lots of manual fine-tuning for every new file and project.</p>
</div>
<div class="paragraph">
<p>Some people got annoyed by these maintenance tasks, and that&#8217;s why they invented the IDE.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="the-present-the-world-with-ides">The Present: The world with IDEs</h2>
<div class="sectionbody">
<div class="paragraph">
<p>An IDE is a source code editor that developers use to write applications and manage projects. It replaces the text editor – and all the switching between browser and terminal and text editors.
The essential word here is <strong>integrated</strong>: An IDE integrates all development tools (listed above) in one window.</p>
</div>
<div class="ulist">
<ul>
<li>
<p>There are New Project and New File menu items that create directories and packages. It creates a professional Ant script. It manages the classpath for you. These formerly manual tasks are always the same for you – now they are automated in the “Project window.</p>
</li>
<li>
<p>The “Editor window lets you edit Java and XML files. (more details below)</p>
</li>
<li>
<p>You can drag and drop commonly used code snippets from a “Palette window into your Java files.</p>
</li>
<li>
<p>A “Navigator window gives you a quick overview of long Java classes, and lets you jump to methods and fields.</p>
</li>
<li>
<p>The Build button starts the JDK6 compiler (<code>ant</code> and <code>javac</code>), the Clean button runs <code>ant clean</code>, the Run button runs the application (<code>ant run</code> and <code>java</code>) – all these tasks are now once-click actions in a toolbar or context menu.</p>
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<li>
<p>After building and running, the IDE opens the “Application window. This window is what end-users of your applications will see. Here you can test your gameplay.</p>
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</ul>
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<div class="paragraph">
<p><strong>The Editor</strong> is the heart of the IDE, and it has tons of great additional capabilties:</p>
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<div class="ulist">
<ul>
<li>
<p>The IDE tries to compile in the background what you write in the Editor. If you made a horrible, but obvious, mistake (forgot semicolon, mixed up data types, made a typo in a method call…) it tells you so immediately through warning colors and icons. This is called syntactic and semantic code highlighting.</p>
<div class="ulist">
<ul>
<li>
<p>You still get Terminal output for errors and warnings (in the “Output window inside the IDE), but this way you erradicate tiny typos and compiletime errors immediately, and you can focus on serious runtime errors in the Output window.</p>
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</li>
<li>
<p>The number of commands in the Java <abbr title="Application Programming Interface">API</abbr> is limited. So while you type a method or class name, there is only a limited number of things it can be. If you temporarily forgot what a method was called, the Editor pops up a list of options (plus javadoc comments), and you can simply select it.</p>
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<li>
<p>Similarly, every class and method only has a limited number of arguments. Again, the IDE pops up a list of expected arguments, so you don&#8217;t need to search for them in the javadoc.</p>
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<div class="sect1">
<h2 id="your-future-a-world-with-jmonkeyengine-sdk">Your Future: A World With jMonkeyEngine SDK</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The jMonkeyEngine SDK is the same as NetBeans IDE, plus</p>
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<div class="ulist">
<ul>
<li>
<p>The New Project Wizards automatically adds the jMonkeyEngine libraries on the classpath and creates a build script.</p>
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<p>The javadoc popup dispalys Standard Java and jMonkeyEngine APIs in the editor.</p>
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<li>
<p>The Palette contains special code snippets from the jMonkeyEngine <abbr title="Application Programming Interface">API</abbr> for loading and saving 3D objects, input handling, nodes, lights, materials, rotation constants, etc.</p>
</li>
<li>
<p>The Projects, SceneComposer, and SceneExplorer windows let you convert, preview, and arrange 3D models before you load them in your Java code.</p>
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<li>
<p>And more…</p>
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<div class="imageblock" style="text-align: center">
<div class="content">
<img src="images/sdk/jmonkeyplatform-docu-1.png" alt="jmonkeyplatform-docu-1.png" height="">
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<div class="paragraph">
<p>You see how such a unique IDE can speed up your development process drastically, it&#8217;s worth giving it a try!</p>
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<div class="ulist">
<ul>
<li>
<p><a href="http://www.youtube.com/watch?v=cTErYjsJ_Yk">Video: jMonkeyEngine3 - Intro</a></p>
</li>
<li>
<p><a href="sdk/comic.html">jMonkeyEngine SDK - the Comic</a></p>
</li>
</ul>
</div>
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Last updated 2016-05-21 23:44:18 UTC
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