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<!DOCTYPE HTML>
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<title>Complexity of the JDK8</title>
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<h1>Visualizing Java 8</h1>
<p>
The following is a visualization of the relative size of the packages – measured in terms of the number of bytecode instructions – of Oracle JDK 1.8.0's runtime jar (rt.jar) for Mac OS X.
As you can see, the <code>java</code> package and its subpackages contains a major part of the code.
Another major package is (more or less as expected) the <code>javax</code> package. (JavaFX is stored in another jar and is not considered here.)
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However, it is very interesting that more than half of the code belongs to packages (<code>com</code> and <code>sun</code>) that are not intended to be used by the regular Java developer.
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To get more detailed information on a package and its sub-packages just <emph>left-click</emph> on the package. If you want to get more abstract information <emph>right click</emph> on the package.
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The visualization was created using: <a href="https://philogb.github.io/jit/">JavaScript InfoVis Toolkit</a>.
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<p>
The analysis was written using the OPAL Bytecode toolkit and is shown next (5 lines of boilerplate and 12 lines for the analysis).
<pre><code>object InstructionStatistics extends AnalysisApplication {
val analysis = new Analysis[URL, BasicReport] {
def description: String = "Collects information about the number of instructions per package."
def analyze(project: Project[URL], parameters: Seq[String]) = {
import scala.collection.mutable.{ HashSet, HashMap }
// FQPN = FullyQualifiedPackageName
val instructionsPerFQPN = HashMap.empty[String, Int]
for {
classFile <- project.allClassFiles
packageName = classFile.thisType.packageName
MethodWithBody(body) <- classFile.methods
} {
instructionsPerFQPN.update(
packageName,
instructionsPerFQPN.getOrElse(packageName, 0) + body.programCounters.size)
}
val json : String = // generate the JSON
BasicReport(json)
}
}
}</code></pre>
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