protected void METHOD_1 ( TYPE_1 listener ) { if ( ! ( this . VAR_1 . contains ( listener ) ) ) { this . VAR_1 . add ( listener ) ; } } 

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