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Retrieves the manifest from a JAR file and writes the manifest contents to a file

import java.io.FileOutputStream; import java.io.OutputStream; import java.util.jar.JarFile; import java.util.jar.Manifest; public class Main {   public static void main(String[] argv) throws Exception {     JarFile jarfile = new JarFile("filename.jar");     Manifest manifest = jarfile.getManifest();     OutputStream fos = new FileOutputStream("manifest");     jarfile.getManifest().write(fos);     fos.close();   } }