utilMDE
Class ClassFileVersion

Object
  ClassFileVersion

public class ClassFileVersion
extends Object

Given a list of .class files, print the class file version and also the JDK/JRE version required to run it. A .jar file can also be supplied, in which case each .class file within it is procesed. Example use: java ClassFileVersion MyClass.class

Supplying the "-min JDKVER" argument suppresses output except for .class files that require at least that JDK version. For instance, to list all the .class/.jar files that require JDK 6 or later, in this or any subdirectory, run find . \( -name '*.class' -o -name '*.jar' \) -print | xargs java ClassFileVersion -min 6

Constructor Summary

ClassFileVersion()

Method Summary

static void	main(String[] args)
static void	processClassFile(String filename, InputStream is)
static double[]	versionNumbers(InputStream is) Returns null if there is an error or the input isn't a class file.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ClassFileVersion

public ClassFileVersion()

Method Detail

main

public static void main(String[] args)
                 throws Exception

Throws:

Exception

processClassFile

public static void processClassFile(String filename,
                                    InputStream is)

versionNumbers

public static double[] versionNumbers(InputStream is)

Returns null if there is an error or the input isn't a class file.