Chapter 18, Problem 7E

Explanation of Solution

Method:

//define a method

public String toString() {

    //condition initialized to check whether the string is empty or not

    if (isEmpty()) {

        //return statement

        return "[]";

    } else {

        //declare the required variables

        String result = "[";

       //loop initialized to verify the value of "front"

        for (Node front : elementData) {

           //assign the value

            Node current = front;

             //loop initialized till the value of current is not equal to null

            while (current != null) {

                //condition initialized to check whether the length of the result is greater than 1

                if (result.length() > 1) {

                    //assign the value

                    result += ", ";

                }

                //evaluate the values

                result += current...