public void add ( TYPE_1 VAR_1 ) throws TYPE_2 { assert VAR_1 != null ; if ( contains ( VAR_1 ) ) { throw new TYPE_2 ( ) ; } VAR_2 . add ( VAR_1 ) ; } 

public void add ( TYPE_1 VAR_1 ) throws TYPE_2 { assert VAR_1 != null ; VAR_2 . add ( VAR_1 ) ; } 
