public synchronized void add ( final TYPE_1 VAR_1 ) { this . VAR_2 . add ( VAR_1 ) ; METHOD_1 ( ) ; } 

public synchronized void add ( final TYPE_1 VAR_1 ) { if ( this . VAR_2 . contains ( VAR_1 ) ) { return ; } this . VAR_2 . add ( VAR_1 ) ; METHOD_1 ( ) ; } 
