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

public void METHOD_1 ( TYPE_1 VAR_1 ) { if ( ( VAR_1 != null ) && ( ! ( this . VAR_2 . contains ( VAR_1 ) ) ) ) this . VAR_2 . add ( VAR_1 ) ; } 
