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New JarOutputStream(OutputStream out)

import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.InputStream; import java.util.jar.JarOutputStream; import java.util.jar.Pack200; import java.util.zip.GZIPInputStream; public class Main {   public static void main(String[] args) throws Exception {     String inName = args[0];     String outName;     if (inName.endsWith(".pack.gz")) {       outName = inName.substring(0, inName.length() - 8);     } else if (inName.endsWith(".pack")) {       outName = inName.substring(0, inName.length() - 5);     } else {       outName = inName + ".unpacked";     }     JarOutputStream out = null;     InputStream in = null;     Pack200.Unpacker unpacker = Pack200.newUnpacker();     out = new JarOutputStream(new FileOutputStream(outName));     in = new FileInputStream(inName);     if (inName.endsWith(".gz"))       in = new GZIPInputStream(in);     unpacker.unpack(in, out);     out.close();   } }