Merge "Remove incorrect/misleading irrelevancies from example code." (d2f24616) · Commits · e / os / android_frameworks_base

docs/html/guide/practices/design/performance.jd

+7 −13

Original line number	Diff line number	Diff line
		@@ -356,25 +356,19 @@ for loop syntax will be exactly equivalent to explicit iterator usage.</p>

		<p>There are several alternatives for iterating through an array:</p>

		<pre>public class Foo {
		<pre> static class Foo {
		int mSplat;
		}
		public class ArrayBenchmark {
		Foo[] mArray = new Foo[27];
		{
		for (int i = 0; i < mArray.length; ++i) {
		mArray[i] = new Foo();
		}
		}
		Foo[] mArray = ...

		public static void zero() {
		public void zero() {
		int sum = 0;
		for (int i = 0; i < mArray.length; ++i) {
		sum += mArray[i].mSplat;
		}
		}

		public static void one() {
		public void one() {
		int sum = 0;
		Foo[] localArray = mArray;
		int len = localArray.length;
		@@ -384,13 +378,13 @@ public class ArrayBenchmark {
		}
		}

		public static void two() {
		public void two() {
		int sum = 0;
		for (Foo a : mArray) {
		sum += a.mSplat;
		}
		}
		}</pre>
		</pre>

		<p><strong>zero()</strong> is slowest, because the JIT can't yet optimize away
		the cost of getting the array length once for every iteration through the