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Reinier Zwitserloot
81 lines
3.5 KiB
HTML
81 lines
3.5 KiB
HTML
<!DOCTYPE html>
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<html><head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<link rel="stylesheet" type="text/css" href="../../logi/reset.css" />
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<link rel="stylesheet" type="text/css" href="../features.css" />
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<link rel="shortcut icon" href="../../favicon.ico" type="image/x-icon" />
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<meta name="description" content="Spice up your java" />
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<title>EXPERIMENTAL – @UtilityClass</title>
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</head><body><div id="pepper">
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<div class="minimumHeight"></div>
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<div class="meat">
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<div class="header"><a href="../../index.html">Project Lombok</a></div>
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<h1>@UtilityClass</h1>
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<div class="byline">Utility, metility, wetility! Utility classes for the masses.</div>
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<div class="since">
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<h3>Since</h3>
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<p>
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<code>@UtilityClass</code> was introduced as an experimental feature in lombok v1.16.2.
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</p>
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</div>
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<div class="experimental">
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<h3>Experimental</h3>
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<p>
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Experimental because:
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<ul>
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<li>Some debate as to whether its common enough to count as boilerplate.</li>
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</ul>
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Current status: <em>positive</em> - Currently we feel this feature may move out of experimental status with no or minor changes soon.
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</div>
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<div class="overview">
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<h3>Overview</h3>
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<p>
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A utility class is a class that is just a namespace for functions. No instances of it can exist, and all its members
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are static. For example, <code>java.lang.Math</code> and <code>java.util.Collections</code> are well known utility classes. This annotation automatically turns the annotated class into one.
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</p><p>
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A utility class cannot be instantiated. By marking your class with <code>@UtilityClass</code>, lombok will automatically
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generate a private constructor that throws an exception, flags as error any explicit constructors you add, and marks
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the class <code>final</code>. If the class is an inner class, the class is also marked <code>static</code>.
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</p><p>
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<em>All</em> members of a utility class are automatically marked as <code>static</code>. Even fields and inner classes.
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</p>
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</div>
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<div class="snippets">
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<div class="pre">
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<h3>With Lombok</h3>
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<div class="snippet">@HTML_PRE@</div>
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</div>
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<div class="sep"></div>
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<div class="post">
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<h3>Vanilla Java</h3>
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<div class="snippet">@HTML_POST@</div>
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</div>
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</div>
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<div style="clear: left;"></div>
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<div class="overview">
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<h3>Small print</h3><div class="smallprint">
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<p>
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There isn't currently any way to create non-static members, or to define your own constructor. If you want to instantiate
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the utility class, even only as an internal implementation detail, <code>@UtilityClass</code> cannot be used.
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</p>
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</div>
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</div>
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<div class="footer">
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<a href="index.html">Back to experimental features</a> | <a href="onX.html">Previous feature (onX)</a> | <a href="Helper.html">Next feature (@Helper)</a><br />
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<a href="../../credits.html" class="creditsLink">credits</a> | <span class="copyright">Copyright © 2009-2016 The Project Lombok Authors, licensed under the <a href="http://www.opensource.org/licenses/mit-license.php">MIT license</a>.</span>
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</div>
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<div style="clear: both;"></div>
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</div>
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