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  1. PO
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    <p>I understand that by "implement" you mean that you want to take this sample code and run it.</p> <p>Each Java file contains a top-level class that's named the same as the file. In this case, the class's name is <code>QuickFileUserCount</code> and the file should be named <code>QuickFileUserCount.java</code>. If the file had a "package" statement at the top, then that would specify the directory that the file is in; since it doesn't, it'll be in whatever your working directory is.</p> <p>Java programs start by calling the <code>main</code> method on some class. Any class can have a <code>main</code> method, and so you specify the class that you want to start running in.</p> <p>One detail that makes this example a little more involved is the <code>import</code> from the Apache Commons. This tells Java that the <code>QuickFileUserCount</code> class uses the <code>Base64</code> class from <a href="http://commons.apache.org/proper/commons-codec/" rel="nofollow" title="Apache Commons Codec">Apache Commons Codec</a>. You'll need the Commons Codec library to compile or run this example.</p> <p>It's usually easiest to use an IDE such as Eclipse to develop Java applications, but for a simple trial of this example:</p> <ul> <li>Download the Commons Codec library from the Apache Web site. Unpack <code>commons-codec-1.8.jar</code> into a temporary directory.</li> <li>Save the example with the filename <code>QuickFileUserCount.java</code>.</li> <li><p>Compile it with the following command (you'll need to have the Java Development Kit installed):</p> <pre><code>javac -classpath commons-codec-1.8.jar QuickFileUserCount.java </code></pre> <p>The "classpath" option tells the Java compiler to look for the Base64 class inside that jar file.</p></li> <li><p>Run it using the following command:</p> <pre><code>java -classpath commons-codec-1.8.jar QuickFileUserCount </code></pre> <p>Note that you don't use the ".java" this time. You should see the usage statement printed out.</p></li> </ul>
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    1. POImplementing Java API Sample Code
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    1. USchrylis
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    1. COthank you very much. I will try this. Two questions: The last command you posted that I should run, where do i run in from and how will the output look like? Do I run it from within eclipse? Also, I am downloading eclipse now, is Eclipse Standard 4.33 sufficient together with the JDK?
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      1. USDavid Van Staden
    2. CORegular Eclipse will not have any difficulties with this code, but you will still need to import the Commons Codec jar into your project. Use the steps in @Jace's answer. If you're running from Eclipse instead of from the command line, you can right-click on the class in the Navigator and Run As->Java Application. Eclipse will compile it, and the output will appear in the Console view. If you need more information, search for an introduction to writing console Java applications.
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