Java Blog für Programmierer

Average number of lines per method in the JDK

14.02.2015 · Christian Ullenboom

The JDK itself can help us to count the lines of code, we just need to parse the source and get the method bodies in a String representation–then we can count the lines. A quick statistic from the new Java 8 Stream API will give us the numbers.

Code first:

import java.io.IOException;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.*;
import javax.tools.JavaCompiler;
import javax.tools.JavaCompiler.CompilationTask;
import javax.tools.StandardJavaFileManager;
import javax.tools.ToolProvider;
import com.sun.source.tree.CompilationUnitTree;
import com.sun.source.tree.MethodTree;
import com.sun.source.util.JavacTask;
import com.sun.source.util.TreeScanner;

public class AverageNumberOfLinesInJDKFinder {
  public static void main( String[] args ) throws IOException {

    String[] files = findAllJavaSourceFiles( "C:/Program Files/Java/jdk1.8.0/src/" );
    JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();

    try ( StandardJavaFileManager fileManager = compiler.getStandardFileManager( null, null, null ) ) {
      CompilationTask task = compiler.getTask( null, fileManager, null, null, null,
                                               fileManager.getJavaFileObjects( files ) );

      JavacTask javacTask = (JavacTask) task;
      Iterable

Kategorien: Allgemein