JDK 7 code statistics
I wanted to get Java source statistics and find out how many parameters on average methods have, methods in classes, constructors, etc. The question is not completely idle, because based on this data, you can calculate the default default size for containers for these entities in the program code models (AST) to save memory. In particular, we are talking about the Spoon project. With the help of this library I conducted an analysis, by the way.
What could be more logical than testing the statistics of the source JDK, to make some assumptions about any Java-code. Along the way, I collected the most unusual instances - for example, methods with the largest number of parameters.
To see them google signature - the first link should be to Javadoc or to GrepCode. Or, if IntelliJ IDEA is open in front of you, simply paste in the name of the class or method after pressing Shift four times.
I limited myself to java. *, Javax. * And org. *, As well as JDK 7, not 8, because the bugs of the Eclipse compiler, on which Spoon is based, do not allow building AST.
')
From a statistical point of view, I consider it a good assumption that the numbers of all the entities under consideration are distributed according to the Poisson law , therefore the only number — the average value — describes the distribution quite well.
But, if you wish, you can conduct a more in-depth analysis, or test your project: gist.github.com/leventov/1f8d8d470b9632bc3cc3
Medium: 1,063
Medium: 0.010
Medium: 1,207
Medium: 0.001
Many do not even know that it happens. In the JDK, there were already four classes with parameterized constructors. Although I had occasion to try on this chip in practice, and, it seems, not even once.
Medium: 0.117
Unexpectedly, there was not a single class with more than three typical parameters. My personal best is 8.
Medium: 0.555
Medium: 0.057
Here, on the contrary, JDK authors like initialization blocks more than me. I never wrote more than one block per class.
Medium: 3,861
Medium: 1,467
Average: 8,003
Medium: 0.327
What could be more logical than testing the statistics of the source JDK, to make some assumptions about any Java-code. Along the way, I collected the most unusual instances - for example, methods with the largest number of parameters.
To see them google signature - the first link should be to Javadoc or to GrepCode. Or, if IntelliJ IDEA is open in front of you, simply paste in the name of the class or method after pressing Shift four times.
I limited myself to java. *, Javax. * And org. *, As well as JDK 7, not 8, because the bugs of the Eclipse compiler, on which Spoon is based, do not allow building AST.
')
From a statistical point of view, I consider it a good assumption that the numbers of all the entities under consideration are distributed according to the Poisson law , therefore the only number — the average value — describes the distribution quite well.
But, if you wish, you can conduct a more in-depth analysis, or test your project: gist.github.com/leventov/1f8d8d470b9632bc3cc3
Method parameters
Medium: 1,063
| Qty | Method |
|---|---|
| 12 | java.lang.String layoutCompoundLabel (javax.swing.JComponent, java.awt.FontMetrics, java.lang.String, javax.swing.Icon, int, int, int, int, java.awt.Rectangle, java.awt.Rectangle , java.awt.Rectangle, int) |
| 12 | void drawChunk (java.awt.Image, java.awt.Graphics, boolean, int, int, int, int, int, int, int, int, boolean) |
| 12 | java.lang.String layoutText (javax.swing.plaf.synth.SynthContext, java.awt.FontMetrics, java.lang.String, javax.swing.Icon, int, int, int, int, java.awt.Rectangle, java .awt.Rectangle, java.awt.Rectangle, int) |
| 14 | void paintRow (javax.swing.tree.TreeCellRenderer, javax.swing.tree.DefaultTreeCellRenderer, javax.swing.plaf. , java.awt.Insets, java.awt.Rectangle, java.awt.Rectangle, javax.swing.tree.TreePath, int, boolean, boolean, boolean) |
| 15 | void initMouseEvent (java.lang.String, boolean, boolean, org.w3c.dom.views.AbstractView, int, int, int, int, int, boolean, boolean, boolean, boolean, short, org.w3c.dom.events .EventTarget) |
| sixteen | void setRaster (int, int, int, int, int, int, int, int, int, int, int, int, int, int, int, int) |
Typical parameters of methods
Medium: 0.010
| Qty | method |
|---|---|
| 2 | <K, V> java.util.Map checkedMap (java.util.Map, java.lang.Class, java.lang.Class) |
| 2 | <K, V> K keyOrNull (java.util.TreeMap $ Entry) |
| 2 | <K, V> java.util.concurrent.ConcurrentHashMap $ HashEntry entryAt (java.util.concurrent.ConcurrentHashMap $ HashEntry [], int) |
| 2 | <U, W> java.util.concurrent.atomic.AtomicReferenceFieldUpdater newUpdater (java.lang.Class, java.lang.Class, java.lang.String) |
| 2 | <K, V> java.util.Map newHashMap () |
| 2 | <M, I> javax.swing.RowFilter andFilter (java.lang.Iterable) |
| 2 | <R, P> R accept (javax.lang.model.element.AnnotationValueVisitor, P) |
| 2 | <R, P> R accept (javax.lang.model.element.ElementVisitor, P) |
| 2 | <R, P> R accept (javax.lang.model.type.TypeVisitor, P) |
| 3 | <K, V, T> java.util.Collections $ CheckedMap $ CheckedEntrySet $ CheckedEntry checkedEntry (java.util.Map $ Entry, java.lang.Class) |
Constructor Parameters
Medium: 1,207
| Qty | Constructor |
|---|---|
| 12 | java.awt.LinearGradientPaintContext (java.awt.LinearGradientPaint, java.awt.image.ColorModel, java. awt.geom.Point2D, java.awt.geom.Point2D, float [], java.awt.Color [], java.awt.MultipleGradientPaint $ CycleMethod, java.awt.MultipleGradientPaint $ ColorSpaceType) |
| 12 | java.lang.management.ThreadInfo (java.lang.Thread, int, java.lang.Object, java.lang.Thread, long, long, long, long, java.lang.StackTraceElement [], java.lang.Object [ ], int [], java.lang.Object []) |
| 12 | javax.swing.event.MenuDragMouseEvent (java.awt.Component, int, long, int, int, int, int, int, int, boolean, javax.swing.MenuElement [], javax.swing.MenuSelectionManager) |
| 13 | java.awt.event.MouseWheelEvent (java.awt.Component, int, long, int, int, int, int, int, int, boolean, int, int, int) |
| 13 | java.util.SimpleTimeZone (int, java.lang.String, int, int, int, int, int, int, int, int, int, int, int) |
| 14 | java.awt.event.MouseWheelEvent (java.awt.Component, int, long, int, int, int, int, int, int, boolean, int, int, int, double) |
| 15 | java.awt.RadialGradientPaintContext (java.awt.RadialGradientPaint, java.awt.image.ColorModel, java.awt.Rectangle, java. float, float, float, float, float [], java.awt.Color [], java.awt.MultipleGradientPaint $ CycleMethod, java.awt.MultipleGradientPaint $ ColorSpaceType) |
| sixteen | javax.imageio.spi.ImageReaderWriterSpi (java.lang.String, java.lang.String, java.lang.String [], java.lang.String [], java.lang.String [], java.lang.String, boolean, java.lang.String, java.lang.String, java.lang.String [], java.lang.String [], boolean, java.lang.String, java.lang.String, java.lang.String [ ], java.lang.String []) |
| 18 | javax.imageio.spi.ImageReaderSpi (java.lang.String, java.lang.String, java.lang.String [], java.lang.String [], java.lang.String [], java.lang.String, java.lang.Class [], java.lang.String [], boolean, java.lang.String, java.lang.String, java.lang.String [], java.lang.String [], boolean, java. lang.String, java.lang.String, java.lang.String [], java.lang.String []) |
| 18 | javax.imageio.spi.ImageWriterSpi (java.lang.String, java.lang.String, java.lang.String [], java.lang.String [], java.lang.String [], java.lang.String, java.lang.Class [], java.lang.String [], boolean, java.lang.String, java.lang.String, java.lang.String [], java.lang.String [], boolean, java. lang.String, java.lang.String, java.lang.String [], java.lang.String []) |
Typical parameters of constructors
Medium: 0.001
Many do not even know that it happens. In the JDK, there were already four classes with parameterized constructors. Although I had occasion to try on this chip in practice, and, it seems, not even once.
| Qty | Constructor |
|---|---|
| one | javax.management.StandardEmitterMBean (T, java.lang.Class, boolean, javax.management.NotificationEmitter) |
| one | javax.management.StandardMBean (T, java.lang.Class) |
| one | javax.management.openmbean.OpenMBeanAttributeInfoSupport (java.lang.String, java.lang.String, javax.management.openmbean.OpenType, boolean, boolean, boolean, T) |
| one | javax.management.openmbean.OpenMBeanParameterInfoSupport (java.lang.String, java.lang.String, javax.management.openmbean.OpenType, T) |
Typical class parameters
Medium: 0.117
Unexpectedly, there was not a single class with more than three typical parameters. My personal best is 8.
| Qty | Class |
|---|---|
| 2 | class javax.swing.DefaultRowSorter |
| 2 | class javax.swing.DefaultRowSorter $ ModelWrapper |
| 2 | class javax.swing.RowFilter |
| 2 | class javax.swing.RowFilter $ AndFilter |
| 2 | class javax.swing.RowFilter $ Entry |
| 2 | class javax.swing.RowFilter $ NotFilter |
| 2 | class javax.swing.RowFilter $ OrFilter |
| 2 | class javax.swing.SwingWorker |
| 2 | class javax.xml.bind.annotation.adapters.XmlAdapter |
| 3 | class java.util.Collections $ CheckedMap $ CheckedEntrySet $ CheckedEntry |
Implemented interfaces
Medium: 0.555
| Qty | Class |
|---|---|
| 6 | class javax.swing.plaf.basic.BasicComboBoxUI $ Handler |
| 6 | class javax.swing.plaf.basic.BasicTabbedPaneUI $ Handler |
| 6 | class javax.swing.plaf.basic.BasicTableUI $ Handler |
| 6 | class javax.swing.text.JTextComponent $ AccessibleJTextComponent |
| 7 | class javax.swing.JTable |
| 7 | class javax.swing.JTable $ AccessibleJTable |
| 7 | class javax.swing.plaf.basic.BasicInternalFrameUI $ Handler |
| 7 | class javax.swing.plaf.basic.BasicListUI $ Handler |
| ten | class javax.swing.plaf.basic.BasicTreeUI $ Handler |
| 17 | class java.awt.AWTEventMulticaster |
Anonymous initialization blocks
Medium: 0.057
Here, on the contrary, JDK authors like initialization blocks more than me. I never wrote more than one block per class.
| Qty | Class |
|---|---|
| 2 | class javax.management.remote.rmi.RMIConnector |
| 2 | class javax.swing.text.html.HTML |
| 3 | class java.lang.invoke.CallSite |
| 3 | class java.lang.invoke.MethodHandle |
| 3 | class java.lang.invoke.MethodHandleNatives |
| 3 | class java.math.BigInteger |
| 3 | class java.net.InetAddress |
| 3 | class java.util.zip.ZipFile |
| 3 | class javax.swing.text.rtf.RTFReader |
| 6 | class java.lang.invoke.LambdaForm |
Fields
Medium: 3,861
| Qty | Class |
|---|---|
| 84 | class java.awt.Event |
| 84 | class java.util.Calendar |
| 93 | class javax.swing.plaf.nimbus.InternalFrameTitlePaneMaximizeButtonPainter |
| 98 | class java.awt.Component |
| 99 | enum java.lang.Character $ UnicodeScript |
| 130 | class java.awt.color.ICC_Profile |
| 140 | class javax.swing.plaf.nimbus.FileChooserPainter |
| 209 | class java.awt.event.KeyEvent |
| 213 | class java.lang.Character $ UnicodeBlock |
| 223 | class java.awt.PageAttributes $ MediaType |
Constructors
Medium: 1,467
| Qty | Class |
|---|---|
| ten | class java.lang.invoke.MemberName |
| ten | class java.net.Socket |
| ten | class java.sql.BatchUpdateException |
| 12 | class java.math.BigInteger |
| 13 | class java.util.Scanner |
| 14 | class java.awt.Dialog |
| sixteen | class java.util.Formatter |
| sixteen | class javax.swing.JDialog |
| 17 | class java.lang.String |
| 17 | class java.math.BigDecimal |
Methods
Average: 8,003
| Qty | Class |
|---|---|
| 137 | class javax.swing.plaf.synth.ParsedSynthStyle $ DelegatingPainter |
| 143 | class javax.swing.plaf.nimbus.SynthPainterImpl |
| 143 | class javax.swing.plaf.synth.ImagePainter |
| 145 | class java.awt.Window |
| 147 | class javax.swing.JTree |
| 148 | class javax.swing.plaf.nimbus.FileChooserPainter |
| 152 | class java.awt.Container |
| 187 | class javax.swing.JComponent |
| 196 | class javax.swing.JTable |
| 331 | class java.awt.Component |
Nested classes
Medium: 0.327
| Qty | Class |
|---|---|
| 20 | class javax.swing.plaf.metal.MetalBorders |
| 20 | class javax.swing.text.html.CSS |
| 21 | class javax.swing.plaf.basic.BasicTreeUI |
| 21 | class javax.swing.text.html.HTMLDocument $ HTMLReader |
| 27 | class java.beans.MetaData $ java_util_Collections |
| thirty | class javax.swing.plaf.metal.MetalIconFactory |
| 33 | class javax.swing.text.DefaultEditorKit |
| 36 | class java.util.Collections |
| 48 | class java.beans.MetaData |
| 59 | class java.util.regex.Pattern |
Source: https://habr.com/ru/post/258641/
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