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    <p>You've got <code>Comparable</code>, so if we has a <code>zero</code>, <code>a[0]&gt;0</code> could be replaced by <code>a[0].compareTo(zero) &gt; 0</code> (no, I think it's <code>&lt; 0</code>, I can never remember). But now we've run out of useful stuff from <code>Double</code> and the like.</p> <p>If <code>Double</code> and friends weren't <code>java.lang.Comparable</code> we could supply our own <code>java.util.Comparator</code>. That is we take the implementation of comparison outside of the data object. We can also do that addition and multiplication.</p> <pre><code>public interface Testor&lt;T&gt; { // Choose a better name... boolean isStriclyPositive(T value); T add(T lhs, T rhs); T square(T value); } static final Testor&lt;Integer&gt; INTEGER_TESTOR = new Testor&lt;&gt;() { // Java SE 7 diamond. public boolean isStriclyPositive(Integer value) { return value &gt; 0; } public Integer add(Integer lhs, Integer rhs) { return lhs + rhs; } public Integer square(Integer value) { return value*value; } } // ... same for Double, etc.; can't use an enum :( ... test(new Integer[] { 42, 1972, 86 }, INTEGER_TESTOR); public &lt;T&gt; void test(T[] a, Testor&lt;T&gt; testor) { T b = a[0]; if (testor.isStrictlyPositive(a[0])) { a[0] = testor.square(a[0]); b = testor.add(b, a[1]); } } </code></pre> <p>Note for things like <code>Short</code>, summing two of them will give you an <code>int</code>.</p> <p>(Usual Stack Overflow disclaimer: not so much as attempted to compile the code.)</p>
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    1. POHow to write a generic method in Java to support comparison and arithmetic operations
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    1. USTom Hawtin - tackline
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