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copied!<p>I think the original problem has been <a href="https://stackoverflow.com/questions/464216/strange-classes-passed-from-matlab-to-java#466400">updated by the OP</a>, so I'll take the chance to summarize our findings so far:</p> <ul> <li><p>We have established that the sample code in the original question produces the expected behavior. <strong>MATLAB passes data as primitives to Java, and Java performs the appropriate autoboxing to Objects.</strong> As pointed out in <a href="https://stackoverflow.com/questions/464216/strange-classes-passed-from-matlab-to-java#466086">Matthew Simoneau's reply</a>, MATLAB explains how it matches its data types to Java data types in the "<a href="http://www.mathworks.com/help/matlab/matlab_external/passing-data-to-a-java-method.html" rel="nofollow noreferrer">Passing Data to a Java Method</a>" section of its documentation. The surprising thing is that a single MATLAB data type may match different Java data types, e.g. <code>logical</code> matches <code>boolean</code>, <code>byte</code>, <code>short</code>, <code>int</code>, <code>long</code>, <code>float</code>, and <code>double</code>, in that order of precedence.</p></li> <li><p>The <code>NoSuchMethodError</code> that the OP initially encountered was caused by the use of a wrong method. This is <a href="https://stackoverflow.com/questions/464216/strange-classes-passed-from-matlab-to-java#466400">no longer a problem</a>. <strong>Using <code>double[]</code> as the method argument works.</strong> </p></li> <li><p><strong>The "strange" class names (<code>[D</code> and <code>[Z</code>) are actually notations used by Java to describe arrays of primitive types.</strong> The API explains the usage in <a href="http://java.sun.com/javase/6/docs/api/java/lang/Class.html#getName()" rel="nofollow noreferrer">Class.getName()</a>.</p></li> </ul> <p>Case closed =)</p>

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