The main method in Figure’s ListExecutionTimes program contains this local variable declar...

The main method in Figure’s ListExecutionTimes program contains this local variable declaration and initialization:

ArrayList<Double> list = new ArrayList<>();

After determining

ArrayList

execution times, we modified the program by replacing the above statement with this:

LinkedList<Double> list = new LinkedList<>();

Declare the

list

variable in a way that allows you to assign an

ArrayList

object to it initially and then later assign a

LinkedList

object to it. Write the initial declaration and assignment statement, and also write the later assignment statement. Why can you assign either an

ArrayList

object or a

LinkedList

object to this same variable?

Figure ListExecutionTimes program-part A

Figure ListExecutionTimes program-part B