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[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
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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.
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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
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list.sublist(1, 5).get(2)
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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);
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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:
[A, B, C, D, E, F, G, H, I, J] list.subList(3,8): [D, E, F, G, H] list.subList(3,8).get(2): F list.subList(3,8).set(2,"B"): [A, B, C, D, E, B, G, H, I, J] list.indexOf("B"): 1 list.subList(3,8).indexOf("B"): 2 [A, B, C, D, E, B, G, H, I, J] Collections.reverse(list.subList(3,8)): [A, B, C, H, G, B, E, D, I, J] Collections.rotate(list.subList(3,8), 2): [A, B, C, E, D, H, G, B, I, J] Collections.fill(list.subList(3,8), "X"): [A, B, C, X, X, X, X, X, I, J] [A, B, C, I, J] The call list.subList(3,8) at line 6 returns the sublist [D, E, F, G, H]. The call list.subList(3,8).get(2) at line 8 returns F, which is element number 2 in that sublist. The call list.subList(3,8).set(2,"B") at line 10 replaces that element with B in the list. The call list.indexOf("B") at line 12 returns 1 because the first B in the list is element number 1. The call list.subList(3,8).indexOf("B") at line 14 returns 2 because the first B in that sublist is
element number 2 of the sublist. The call Collections.reverse(list.subList(3,8)) at line 17 reverses the five-element sublist [D,E,B,G,H] within the original list, changing [A,B,C,D,E,B,G,H,I,J] to [A,B,C,H,G,B,E,D,I,J]. The call Collections.rotate(list.subList(3,8),2) at line 20 rotates the five-element sublist [H,G,B,E,D] to [E,D,H,G,B], changing the whole list to [A,B,C,E,D,H,G,B,I,J]. The call Collections.fill(list.subList(3,8),"X") at line 23 replaces the five-element sublist [E,D,H,G,B] to [X,X,X,X,X], changing the whole list to [A,B,C,X,X,X,X,X,I,J]. The call list.subList(3,8).clear() at line 25 deletes the five-element sublist [X,X,X,X,X] from the list, changing it to [A,B,C,I,J].
LIST ITERATORS Collection iterators are outlined on page 77. The JCF defines the ListIterator interface as an extension of the Iterator interface. It specifies an additional six methods that reflect the bidirectional nature of a list iterator. All nine methods are shown in Figure 7.1 on page 135. The standard way to obtain a list iterator on a list is to invoke its listIterator() method, just as invoking its iterator() method returns an ordinary (unidirectional) iterator. EXAMPLE 7.3 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"); System.out.println(list);
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