public void METHOD_1 ( TYPE_1 expr ) { if ( null == ( VAR_1 ) ) { VAR_1 = expr ; } else { VAR_1 = TYPE_2 . METHOD_2 ( VAR_1 , expr ) ; } } 

public void METHOD_1 ( TYPE_1 expr ) { if ( null == expr ) { return ; } if ( null == ( VAR_1 ) ) { VAR_1 = expr ; } else { VAR_1 = TYPE_2 . METHOD_2 ( VAR_1 , expr ) ; } } 
