vb.net print barcode zebra THE JAVA COLLECTIONS FRAMEWORK in Java

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THE JAVA COLLECTIONS FRAMEWORK
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void void void void <T> void <T> void
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sort(Object[] a) sort(Object[] a, int fromIndex, int toIndex) sort(short[] a) sort(short[] a, int fromIndex, int toIndex) sort(T[] a, Comparator< super T> c) sort(T[] a, int fromIndex, int toIndex, Comparator< super T> c)
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(There is no sort() method for boolean arrays.) The eight different method() categories are:
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binarySearch() copyOf() copyOfRange() equals() fill() hashCode() sort() toString()
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In addition, there is a single asList() method that returns an ArrayList collection containing the elements passed to it, like this:
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List<String> list = Arrays.asList("CA", "US", "MX");
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THE Collections CLASS The java.util.Collections class provides over 50 static utility methods that implement algorithms for sorting, searching, shuffling, and maintaining collections, among other tasks. EXAMPLE 4.15 Using Utility Methods from the Collections Class
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This program illustrates the addAll(), swap(), sort(), binarySearch(), and reverse() methods that are defined in the Collections, class:
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public class TestCollections { public static void main(String[] args) { List g8 = new ArrayList(); Collections.addAll(g8, "US", "DE", "JP", "FR", "GB", "RU", "CA", "IT"); System.out.println(g8); Collections.swap(g8, 2, 4); System.out.println(g8); Collections.sort(g8); System.out.println(g8); int k = Collections.binarySearch(g8, "CN"); System.out.println(k); if (k < 0) { g8.add(-k - 1, "CN"); }; System.out.println(g8); Collections.reverse(g8); System.out.println(g8); } }
The output is:
[US, DE, JP, FR, GB, RU, CA, IT] [US, DE, GB, FR, JP, RU, CA, IT] [CA, DE, FR, GB, IT, JP, RU, US]
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THE JAVA COLLECTIONS FRAMEWORK
-2 [CA, CN, DE, FR, GB, IT, JP, RU, US] [US, RU, JP, IT, GB, FR, DE, CN, CA] At line 4, the addAll() method is used to load eight strings into the empty list g8. At line 6, the "JP" and "GB" elements are swapped, and then the list is sorted at line 8. At line 10, the binarySearch() method searches for the string "CN". The negative output signals that it is not there. The value of k tells where to insert it to keep the list sorted: at index k 1. Finally, at line 16, the reverse() method reverses the entire list.
AUTOBOXING Java 5.0 introduced autoboxing, which means that a primitive value can be added to a collection without explicitly wrapping it in an object; it will be wrapped, or boxed automatically. It will also be unwrapped when extracted. This is illustrated in Example 4.16. EXAMPLE 4.16 Using Autoboxing
This program creates a list of five integers as an ArrayList<Integer> object:
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import java.util.*; public class TestAutoboxing { public static void main(String[] args) { List<Integer> list = new ArrayList<Integer>(); Collections.addAll(list, 22, 33, 44, 55, 66); System.out.printf("list: %s%n", list); System.out.printf("list.size(): %s%n", list.size()); System.out.printf("list.get(2): %s%n", list.get(2)); int n = list.get(2); System.out.printf("n: %d%n", n); list.remove(2); System.out.printf("list: %s%n", list); System.out.printf("list.size(): %s%n", list.size()); list.remove(new Integer(66)); System.out.printf("list: %s%n", list); System.out.printf("list.size(): %s%n", list.size()); } }
The output is:
list: [22, 33, 44, 55, 66] list.size(): 5 list.get(2): 44 n: 44 list: [22, 33, 55, 66] list.size(): 4 list: [22, 33, 55] list.size(): 3 At line 6, the addAll() method from the Collections class inserts five Integer objects into list. The primitive int values, 22, 33, 44, 55, and 66 are boxed automatically, instantiating the five wrapper
objects to hold them. At line 10, the element at index 2, which is the Integer object that holds the primitive int value 44, is accessed by the get() method. It is automatically unboxed during its assignment to the int variable n. The remove() method is overloaded in the JCF: One version takes an int argument that specifies the position of the element to be removed, and one version takes a reference to an object that equals() the
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