The code List myLs = new ArrayList( ); Uses a List interface variable to reference the concrete ArrayList object. The advantage of doing this is A) the class of the collection object can later be changed to LinkedList,or even Vector,without needing to change anything else in the program B) the class of the collection object can later be changed to LinkedList,Vector,TreeSet,or even HashSet,without needing to change anything else in the program C) the program compiles faster D) None of the above: the statement is a type error.

Question

The code List< String > myLs = new ArrayList< String >( ); Uses a List < String > interface variable to reference the concrete ArrayList< String > object. The advantage of doing this is A) the class of the collection object can later be changed to LinkedList,or even Vector,without needing to change anything else in the program B) the class of the collection object can later be changed to LinkedList,Vector,TreeSet,or even HashSet,without needing to change anything else in the program C) the program compiles faster D) None of the above: the statement is a type error.

Quizplus · Accepted Answer

Using the List interface allows for flexibility in changing the implementation to another List type like LinkedList or Vector without altering the rest of the code.

The Code List< String > MyLs = New ArrayList< String >( );