code: void addInterfaces(Deque<String> intfs, ClassFile cf)
              throws ConstantPoolException {
          int count = cf.interfaces.length;
          for (int i = 0; i < count; i++) {
              intfs.addLast(cf.getInterfaceName(i));
          }
      }
docs: Adds all interfaces from this class to the deque of interfaces.
  
  @param intfs the deque of interfaces
  @param cf the ClassFile of this class
  @throws ConstantPoolException if a constant pool entry cannot be found