public void METHOD_1 ( TYPE_1 listener ) { VAR_1 . remove ( listener ) ; if ( ( VAR_1 . size ( ) ) == 0 ) VAR_1 = null ; } 

public void METHOD_1 ( TYPE_1 listener ) { if ( VAR_1 . contains ( listener ) ) VAR_1 . remove ( listener ) ; if ( ( VAR_1 . size ( ) ) == 0 ) VAR_1 = null ; } 
