public void METHOD_1 ( java.util.List < TYPE_1 > VAR_1 ) { if ( ( this . VAR_2 ) == null ) this . VAR_2 = new java.util.ArrayList < TYPE_1 > ( ) ; this . VAR_2 . METHOD_2 ( VAR_1 ) ; } 

public void METHOD_1 ( java.util.List < TYPE_1 > VAR_1 ) { if ( ( this . VAR_2 ) == null ) this . VAR_2 = new java.util.ArrayList < TYPE_1 > ( ) ; synchronized ( VAR_2 ) { this . VAR_2 . METHOD_2 ( VAR_1 ) ; } } 
