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-<!DOCTYPE html>
-<html><head>
- <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
- <link rel="stylesheet" type="text/css" href="../../logi/reset.css" />
- <link rel="stylesheet" type="text/css" href="../features.css" />
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- <meta name="description" content="Spice up your java" />
- <title>EXPERIMENTAL - @ExtensionMethod</title>
-</head><body><div id="pepper">
- <div class="minimumHeight"></div>
- <div class="meat">
- <div class="header"><a href="../../index.html">Project Lombok</a></div>
- <h1>@Value</h1>
- <div class="byline">Immutable classes made very easy.</div>
- <div class="since">
- <h3>Since</h3>
- <p>
- <code>@Value</code> was introduced as experimental feature in lombok v0.11.4.
- </p><p>
- <code>@Value</code> no longer implies <code>@Wither</code> since lombok v0.11.8.
- </div>
- <div class="experimental">
- <h3>Experimental</h3>
- <p>
- Experimental because:
- <ul>
- <li>Various choices still have to be vetted as being the correct 'least surprise' choice: Should the class be made final by default, etc.</li>
- </ul>
- Current status: <em>positive</em> - Currently we feel this feature may move out of experimental status with no or minor changes soon.
- </div>
- <div class="overview">
- <h3>Overview</h3>
- <p>
- <code>@Value</code> is the immutable variant of <a href="../Data.html"><code>@Data</code></a>; all fields are made <code>private</code> and <code>final</code> by default, and setters are not generated. The class itself is also made <code>final</code> by default, because immutability is not something that can be forced onto a subclass. Like <code>@Data</code>, useful <code>toString()</code>, <code>equals()</code> and <code>hashCode()</code> methods are also generated, each field gets a getter method, and a constructor that covers every
- argument (except <code>final</code> fields that are initialized in the field declaration) is also generated.
- </p><p>
- In practice, <code>@Value</code> is shorthand for: <code>final @ToString @EqualsAndHashCode @AllArgsConstructor @FieldDefaults(makeFinal = true, level = AccessLevel.PRIVATE) @Getter</code>.
- </p><p>
- It is possible to override the final-by-default and private-by-default behaviour using either an explicit access level on a field, or by using the <code>@NonFinal</code> or <code>@PackagePrivate</code> annotations.<br />
- It is possible to override any default behaviour for any of the 'parts' that make up <code>@Value</code> by explicitly using that annotation.
- </p>
- </div>
- <div class="snippets">
- <div class="pre">
- <h3>With Lombok</h3>
- <div class="snippet">@HTML_PRE@</div>
- </div>
- <div class="sep"></div>
- <div class="post">
- <h3>Vanilla Java</h3>
- <div class="snippet">@HTML_POST@</div>
- </div>
- </div>
- <div style="clear: left;"></div>
- <div class="overview">
- <h3>Small print</h3><div class="smallprint">
- <p>
- Look for the documentation on the 'parts' of <code>@Value</code>: <a href="../ToString.html"><code>@ToString</code></a>, <a href="../EqualsAndHashCode.html"><code>@EqualsAndHashCode</code></a>, <a href="../Constructor.html"><code>@AllArgsConstructor</code></a>, <a href="FieldDefaults.html"><code>@FieldDefaults</code></a>, and <a href="../GetterSetter.html"><code>@Getter</code></a>.
- </p><p>
- For classes with generics, it's useful to have a static method which serves as a constructor, because inference of generic parameters via static methods works in java6 and avoids having to use the diamond operator. While you can force this by applying an explicit <code>@AllArgsConstructor(staticConstructor="of")</code> annotation, there's also the <code>@Value(staticConstructor="of")</code> feature, which will make the generated all-arguments constructor private, and generates a public static method named <code>of</code> which is a wrapper around this private constructor.
- </p>
- </div>
- </div>
- <div class="footer">
- <a href="index.html">Back to experimental features</a> | <a href="Wither.html">Previous feature (@Wither)</a> | <a href="onX.html">Next feature (onX)</a><br />
- <a href="../../credits.html" class="creditsLink">credits</a> | <span class="copyright">Copyright &copy; 2009-2013 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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