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AccessController doPrivileged(new PrivilegedAction() )

import java.io.File; import java.security.AccessController; import java.security.PrivilegedAction; public class Main {      static long getLastModified(final File f) {       return ((Long)               AccessController.doPrivileged(new PrivilegedAction() {                   public Object run() {                       return new Long(f.lastModified());                   }               })).longValue();   }    }