<h1 id="immutable-class">Immutable Class<a aria-hidden="true" class="anchor-heading icon-link" href="#immutable-class"></a></h1>
<p>Cannot be changed (mutated)</p>
<p>Whenever changed - a new instance is created</p>
<h2 id="what-makes-a-class-immutable">What makes a class immutable?<a aria-hidden="true" class="anchor-heading icon-link" href="#what-makes-a-class-immutable"></a></h2>
<ul>
<li>Instance variable is final (value can't be changed)</li>
<li>class = final - So subclass can't be created</li>
<li>No setters</li>
</ul>
<h2 id="how-to-create-an-immutable-class">How to create an immutable class<a aria-hidden="true" class="anchor-heading icon-link" href="#how-to-create-an-immutable-class"></a></h2>
<ul>
<li>Create <strong>final</strong> class with all <strong>final data members</strong>.</li>
<li>You can make a class immutable using builder pattern.</li>
</ul>
<h2 id="references">References<a aria-hidden="true" class="anchor-heading icon-link" href="#references"></a></h2>
<p><a href="https://www.journaldev.com/1432/java-immutable-class-builder">Java Immutable Class - Builder Pattern</a></p>
<hr>
<strong>Backlinks</strong>
<ul>
<li><a href="/cs/notes/vqbisdumti23oeq2xk6oml5">String (cs)</a></li>
<li><a href="/cs/notes/rhm2ueynmzepd2gxd9tj0sx">Wrapper Classes (cs)</a></li>
</ul>

Immutable Class



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## References

- Hierarchy inpiration - [Map of Computer Science](https://www.flickr.com/photos/95869671@N08/36231833334/in/photostream/lightbox/)