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A list is a collection of elements that are accessible sequentially: the first element, followed by the second element, followed by the third element, and so on. This is called sequential access or linked access (as opposed to direct or indexed access). A good example is a line of train cars on a track: To get to the fourth car from the first car, you have to go through the second and third cars in that order. This example also illustrates how insertions and deletions are managed in a list. The only changes needed are to the two cars that are adjacent to location where the insertion or deletion is made. None of the other cars is affected. THE JCF List INTERFACE The List interface specified by the Java Collections Framework is outlined on page 85. It adds 10 methods to the 15 methods specified by the Collection interface that it extends. From the JCF inheritance hierarchy shown in Figure 4.1 on page 70, you can see that the Queue, Deque, and Set interfaces all extend the List interface. Consequently, all of the List, Queue, Deque, and Set classes implement the List interface. This includes the concrete classes outlined in 4: ArrayList, Vector, LinkedList, PriorityQueue, ArrayDeque, EnumSet, HashSet, LinkedHashSet, and TreeSet. As Table 4.1 on page 70 shows, the JCF provides both linked and indexed implementations of the List interface: the LinkedList class uses sequential access, while the ArrayList class provides direct access. EXAMPLE 7.1 Testing a List Class

This program illustrates some of the methods specified by the List interface:

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public class TestStringList { public static void main(String[] args) { List<String> list = new ArrayList<String>(); Collections.addAll(list, "GB", "DE", "FR", "ES"); System.out.println(list); list.add(3, "DE"); System.out.println(list); System.out.println("list.get(3): " + list.get(3)); System.out.println("list.indexOf(\"DE\"): " + list.indexOf("DE")); System.out.println("list.indexOf(\"IE\"): " + list.indexOf("IE")); System.out.println("list.subList(1, 5): " + list.subList(1, 5)); list.remove("DE"); System.out.println(list); } }

Important!

The output is:

A final approach to entering the BEx Analyzer workbook is to use the BEx function Open | Open Workbook in the Analysis Mode toolbox. This allows you access to existing

[GB, DE, FR, ES] [GB, DE, FR, DE, ES] list.get(3): DE list.indexOf("DE"): 1 list.indexOf("IE"): -1 list.subList(1, 5): [DE, FR, DE, ES] [GB, FR, DE, ES] The list object is created at line 3 as an ArrayList of String objects. It uses the static addAll() method of the Collections class at line 4 to load four strings into it. The two-argument add() method is tested at line 6, inserting the string "DE" as element number 2. Note that, unlike sets, lists allow duplicate

elements. At line 8, the get() method is used to obtain element number 3. Lines 9 10 illustrate the indexOf() method, returning the index number of the specified element. Note that it returns the index of the first occurrence of the element; DE occurs at both index 1 and index 3. The call list.subList(1, 5) at line 11 returns the sublist of elements indexed from 1 up to (but not including) 5. As long as the two indexes are in range, the size of the sublist will always be their difference; in this case, 5 1 = 4 elements. At line 12, the call list.remove("DE") removes the first occurrence of DE.

THE RANGE-VIEW OPERATION sublist() The sublist() method illustrated in Example 7.1 is far more powerful than what that example suggests. It provides a view into its list, against which other List methods may be applied. When used in the chained-invocation mode, like this

list.sublist(1, 5).get(2)

The multiplier is extremely important in explaining how strong an impact one person s actions can have upon the economy.

it allows the attached method to apply to the list itself while restricting its context to the sublist. Thus, that call, for example, would return element number 2 of the sublist, which is actually element number 3 of the list itself. EXAMPLE 7.2 Using the sublist() Method as a Range-View Operation

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public class TestSubList { public static void main(String[] args) { List<String> list = new ArrayList<String>(); Collections.addAll(list, "A","B","C","D","E","F","G","H","I","J"); System.out.println(list); System.out.println("list.subList(3,8): " + list.subList(3,8)); System.out.println("list.subList(3,8).get(2): " + list.subList(3,8).get(2)); System.out.println("list.subList(3,8).set(2,\"B\"):"); list.subList(3,8).set(2, "B"); System.out.println(list); System.out.println("list.indexOf(\"B\"): " + list.indexOf("B")); System.out.println("list.subList(3,8).indexOf(\"B\"): " + list.subList(3,8).indexOf("B")); System.out.println(list); System.out.println("Collections.reverse(list.subList(3,8)):"); Collections.reverse(list.subList(3,8)); System.out.println(list); System.out.println("Collections.rotate(list.subList(3,8), 2):"); Collections.rotate(list.subList(3,8), 2); System.out.println(list);

CHAP. 7]

The value of the multiplier (k) is found by relating the change in output ( Y) to the initial change in aggregate spending. The value of the multiplier can also be found from the equation k = 1/(1 MPC). Thus, the multiplier is 5 if the MPC = 0.80.

System.out.println("Collections.fill(list.subList(3,8), \"X\"):"); Collections.fill(list.subList(3,8), "X"); System.out.println(list); list.subList(3,8).clear(); System.out.println(list);

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The output is: