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import java.io.FileOutputStream;
import java.io.OutputStream;
import java.util.jar.JarFile;
import java.util.jar.Pack200;
public class Main {
public static void main(String[] args) throws Exception {
JarFile f = new JarFile("a.jar");
Pack200.Packer packer = Pack200.newPacker();
OutputStream out = new FileOutputStream("a.pack");
packer.pack(f, out);
out.close();
}
}
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