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    <p>There is no difference in this case.</p> <p>It's important to realize how references works, and that local variables are distinct from the objects they are referring to. The memory required by local variables themselves are insignificant; you should never hesitate from declaring local variables if it makes the code more readable.</p> <p>Consider for example the following code:</p> <pre><code>String s1 = "a very long string..."; String s2 = s1; </code></pre> <p>This code declares two <code>String</code> references, but they both refer to the same <code>String</code> object. The memory requirement is not doubled in cases like this.</p> <p>You should never underestimate how smart the compiler can be at optimizing codes. Consider the following for example:</p> <pre><code>System.out.println("Hello world!"); System.out.println("Hello world!"); System.out.println("Hello world!"); </code></pre> <p>The above snippet in fact does <em>NOT</em> store the string object <code>"Hello world!"</code> three times in memory! The literal is <em>interned</em> and only stored once in memory.</p> <h3>References</h3> <p><a href="http://docs.oracle.com/javase/specs/jls/se5.0/html/lexical.html#3.10.5" rel="nofollow noreferrer">JLS 3.10.5 String Literals</a></p> <blockquote> <p>Each string literal is a reference to an instance of <code>class String</code>. <code>String</code> objects have a constant value. String literals --or, more generally, strings that are the values of constant expressions-- are "interned" so as to share unique instances, using the method <a href="http://java.sun.com/javase/6/docs/api/java/lang/String.html#intern%28%29" rel="nofollow noreferrer"><code>String.intern</code></a>.</p> </blockquote> <h3>Related questions</h3> <ul> <li><a href="https://stackoverflow.com/questions/3359829/what-is-the-advantage-of-string-object-as-compared-to-string-literal">what is the advantage of string object as compared to string literal</a> <ul> <li>On <code>"string"</code> vs <code>new String("string")</code></li> </ul></li> <li><a href="https://stackoverflow.com/questions/1091045/is-it-good-practice-to-use-java-lang-string-intern">Is it good practice to use java.lang.String.intern()?</a></li> <li><a href="https://stackoverflow.com/questions/1530864/java-why-doesnt-my-string-comparison-work">Java: Why doesn’t my string comparison work?</a></li> <li><a href="https://stackoverflow.com/questions/767372/java-string-equals-versus"> Java String.equals versus == </a></li> </ul>
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