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    <p>Short-circuiting is where an expression is stopped being evaluated as soon as its outcome is determined. So for instance:</p> <pre><code>if (a == b || c == d || e == f) { // Do something } </code></pre> <p>If <code>a == b</code> is true, then <code>c == d</code> and <code>e == f</code> are <strong>never evaluated at all</strong>, because the expression's outcome has already been determined. if <code>a == b</code> is false, then <code>c == d</code> is evaluated; if <em>it's</em> true, then <code>e == f</code> is never evaluated. This may not seem to make any difference, but consider:</p> <pre><code>if (foo() || bar() || baz()) { // Do something } </code></pre> <p>If <code>foo()</code> returns true, then <code>bar</code> and <code>baz</code> are <strong>never called</strong>, because the expression's outcome has already been determined. So if <code>bar</code> or <code>baz</code> has some other effect than just returning something (a <em>side effect</em>), those effects never occur.</p> <p>One great example of short-circuiting relates to object references:</p> <pre><code>if (a != null &amp;&amp; a.getFoo() != 42) { // Do something } </code></pre> <p><code>a.getFoo()</code> would normally throw a <code>NullPointerException</code> if <code>a</code> were <code>null</code>, but because the expression short-circuits, if <code>a != null</code> is <code>false</code>, the <code>a.getFoo()</code> part never happens, so we don't get an exception.</p> <p>Note that not all expressions are short-circuited. The <code>||</code> and <code>&amp;&amp;</code> operators are short-circuited, but <code>|</code> and <code>&amp;</code> are not, nor are <code>*</code> or <code>/</code>; in fact most operators are not.</p>
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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