void deregisterSpring(Spring spring){
  if (spring == null) {
    throw new IllegalArgumentException("spring is required");
  }
  mActiveSprings.remove(spring);
  mSpringRegistry.remove(spring.getId());
}

void deregisterSpring ( Spring spring ) { if ( spring == null ) { throw new IllegalArgumentException ( "spring is required" ) ; } mActiveSprings . remove ( spring ) ; mSpringRegistry . remove ( spring . getId ( ) ) ; }
deregisters a spring from this basespringsystem , so it won ' t be iterated anymore . the spring should not be used anymore after doing this .
