/guava/guava/src/com/google/common/collect/Synchronized.java
return delegate( ).isEmpty( ) ;delegate( ).addLast( e) ;
delegate ( ) .addLast ( e ) ;
delegate().addFirst(e); } } @Override public void addLast(E e) { synchronized (mutex) { <extra_id_0> } } @Override public boolean offerFirst(E e) { synchronized (mutex) { return delegate().offerFirst(e);