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    <p>Your alternatives are:</p> <ul> <li><strong>Java 8</strong> introduces a <a href="https://docs.oracle.com/javase/8/docs/api/java/util/function/Consumer.html" rel="nofollow noreferrer"><code>Consumer</code></a> interface which you can <a href="https://docs.oracle.com/javase/8/docs/api/java/util/function/Consumer.html#andThen-java.util.function.Consumer-" rel="nofollow noreferrer">compose</a>.</li> <li><strong><a href="http://www.eclipse.org/xtend" rel="nofollow noreferrer">Xtend</a></strong>'s standard library contains <a href="http://download.eclipse.org/modeling/tmf/xtext/javadoc/2.3/org/eclipse/xtext/xbase/lib/Procedures.html" rel="nofollow noreferrer"><code>Procedures</code></a>.</li> <li><strong><a href="http://scala-lang.org/" rel="nofollow noreferrer">Scala</a></strong> has <a href="http://www.scala-lang.org/api/current/index.html#scala.Function1" rel="nofollow noreferrer"><code>Function*</code></a>; if a function's return type is <a href="http://www.scala-lang.org/api/current/index.html#scala.Unit" rel="nofollow noreferrer"><code>Unit</code></a>, it is considered a side effect.</li> </ul> <p>In all of these languages, you can use functional interfaces conveniently, so you could also use e.g. <a href="http://functionaljava.org/" rel="nofollow noreferrer">Functional Java</a>'s <a href="http://functionaljava.googlecode.com/svn/artifacts/3.0/javadoc/fj/Effect.html" rel="nofollow noreferrer"><code>Effect</code></a>.</p> <p><strong>Otherwise</strong>, you better rely on existing language constructs for performing side effects, e.g. the built-in <code>for</code> loop. Java &lt; 8 inflicts tremendous syntactic overhead when using lambdas. See <a href="https://stackoverflow.com/questions/9525951/anything-in-guava-similar-to-functional-javas-effect">this question</a> and <a href="http://code.google.com/p/guava-libraries/wiki/FunctionalExplained" rel="nofollow noreferrer">this discussion</a>.</p>
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