@SuppressWarnings("rawtypes")
    public boolean removeAll(Collection c) {
        boolean flag = true;
        if (c == null)
            throw new NullPointerException(" null collection ! ");
        for ( Iterator it = c.iterator(); it.hasNext();	) {
           flag &= this.remove( it.next());
            
        }
        return flag;
    }
@ SuppressWarnings ( "rawtypes" ) public boolean removeAll ( Collection c ) { boolean flag = true ; if ( c == null ) throw new NullPointerException ( " null collection ! " ) ; for ( Iterator it = c . iterator ( ) ; it . hasNext ( ) ; ) { flag &= this . remove ( it . next ( ) ) ; } return flag ; }
Removing an SBB entity from a child relation initiates a cascading
removal of the SBB entity tree rooted by the SBB entity, similar to
invoking the remove method on an SBB local object that represents the SBB
entity.