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    <p>Making <code>immutable</code> return values in java is a matter of <em>either</em> returning already <code>immutable</code> objects types (such as <a href="http://download.oracle.com/javase/6/docs/api/java/lang/String.html" rel="noreferrer">String</a>) or returning a <strong>copy</strong> for non-immutable objects.</p> <hr> <p><strong>Sample 1</strong> - Already immutable object</p> <pre><code>public String getValue() { return value; } </code></pre> <p><strong>Sample 2</strong> - Collection of already immutable objects</p> <pre><code>public List&lt;String&gt; getValues() { return new ArrayList&lt;String&gt;(values); } </code></pre> <p><strong>Sample 3</strong> - Non-immutable object</p> <pre><code>public Complex getComplex() { return complex.clone(); } </code></pre> <p><strong>Sample 4</strong> - Collection of non-immutable objects</p> <pre><code>public List&lt;Complex&gt; getComplex() { List&lt;Complex&gt; copy = new ArrayList&lt;Complex&gt;(complexs.size()); for (Complex c : complexs) copy.add(c.clone()); return copy; } </code></pre> <p>Sample 3 and 4 are for conveniance based on that the complex type implements the <a href="http://download.oracle.com/javase/6/docs/api/java/lang/Cloneable.html" rel="noreferrer"><code>Cloneable</code></a> interface. </p> <p>Furthermore, to avoid subclasses overriding your immutable methods you can declare them <code>final</code>. As a side note, the <a href="http://javapapers.com/design-patterns/builder-pattern/" rel="noreferrer"><code>builder</code></a> pattern is typically useful for constructing immutable objects. </p>
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    1. POWhy getter & setter if return value is mutable?
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    1. USAlexandre Jacob
    1. USJohan Sjöberg
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    1. COHow do I make a return type immutable?
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      1. USateiob
    2. COWhy not just: `new ArrayList<String>(strings)`?
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      1. USTomasz Nurkiewicz
    3. CO@Tomasz, true for this case. Let me edit to exemplify using not already immutable objects.
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      1. USJohan Sjöberg
 

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