vb.net code to generate barcode THE JAVA COLLECTIONS FRAMEWORK in Java

Creating EAN 13 in Java THE JAVA COLLECTIONS FRAMEWORK

THE JAVA COLLECTIONS FRAMEWORK
Recognizing GS1 - 13 In Java
Using Barcode Control SDK for Java Control to generate, create, read, scan barcode image in Java applications.
Create EAN-13 In Java
Using Barcode drawer for Java Control to generate, create EAN-13 Supplement 5 image in Java applications.
[CHAP. 4
Recognizing EAN13 In Java
Using Barcode decoder for Java Control to read, scan read, scan image in Java applications.
Create Bar Code In Java
Using Barcode creator for Java Control to generate, create bar code image in Java applications.
Figure 4.9 The java.util.ListIterator interface
Barcode Recognizer In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
Create EAN-13 In Visual C#.NET
Using Barcode printer for Visual Studio .NET Control to generate, create UPC - 13 image in Visual Studio .NET applications.
The remove() and poll() methods delete and return the element at the front of the queue. The only difference between them is their behavior when the queue is empty: remove() throws a NoSuchElementException, while poll() returns null. The AbstractQueue class implements 5 of the 20 required methods of the Queue interface: add(), addAll(), clear(), element(), and remove(). The purpose of this class (as with all abstract classes) is to serve as a partial implementation, to be completed in a concrete extension by implementing the other required methods. The Javadoc for the AbstractQueue class states: A Queue implementation that extends this class must minimally define a method Queue.offer(E) which does not permit insertion of null elements, along with methods Queue.peek(), Queue.poll(), Collection.size(), and a Collection.iterator() supporting Iterator.remove(). EXAMPLE 4.11 Implementing a LinkedQueue Class
Create UPC - 13 In .NET
Using Barcode creation for ASP.NET Control to generate, create GTIN - 13 image in ASP.NET applications.
Paint EAN-13 In Visual Studio .NET
Using Barcode creator for VS .NET Control to generate, create EAN 13 image in VS .NET applications.
1 2 3 4 5 6
Make GS1 - 13 In VB.NET
Using Barcode encoder for .NET framework Control to generate, create EAN13 image in .NET applications.
UPCA Creator In Java
Using Barcode encoder for Java Control to generate, create UPC Code image in Java applications.
public class TestQueue { public static void main(String[] args) { Queue<String> queue = new LinkedQueue<String>(); Collections.addAll(queue, "AR", "BO", "CO", "EC"); System.out.println(queue); String firstOut = queue.remove();
Generating EAN 128 In Java
Using Barcode printer for Java Control to generate, create EAN128 image in Java applications.
Paint Code 39 Extended In Java
Using Barcode creator for Java Control to generate, create Code 39 Full ASCII image in Java applications.
CHAP. 4]
Generate USPS POSTNET Barcode In Java
Using Barcode creator for Java Control to generate, create USPS POSTal Numeric Encoding Technique Barcode image in Java applications.
Barcode Generation In None
Using Barcode maker for Software Control to generate, create barcode image in Software applications.
THE JAVA COLLECTIONS FRAMEWORK
Code 128 Code Set B Reader In .NET Framework
Using Barcode recognizer for .NET Control to read, scan read, scan image in VS .NET applications.
Encoding ANSI/AIM Code 39 In None
Using Barcode printer for Office Excel Control to generate, create Code 39 Full ASCII image in Excel applications.
Figure 4.10 Specialized methods specified by the java.util.Queue interface
Painting ECC200 In Java
Using Barcode generator for Android Control to generate, create ECC200 image in Android applications.
Bar Code Generator In Objective-C
Using Barcode printer for iPhone Control to generate, create bar code image in iPhone applications.
7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
Generate 2D Barcode In Visual Basic .NET
Using Barcode encoder for .NET framework Control to generate, create 2D Barcode image in .NET applications.
USS Code 39 Scanner In Visual Basic .NET
Using Barcode recognizer for VS .NET Control to read, scan read, scan image in .NET framework applications.
System.out.println(queue); System.out.printf("Removed %s%n", firstOut); queue.add("PE"); System.out.println(queue); String secondOut = queue.remove(); System.out.println(queue); System.out.printf("Removed %s%n", secondOut); } } class LinkedQueue<E> extends AbstractQueue<E> implements Queue<E> { private List<E> list = new LinkedList<E>(); public Iterator<E> iterator() { return list.iterator(); } public boolean offer(E e) { if (e == null) { return false; } else { list.add(e); return true; } }
THE JAVA COLLECTIONS FRAMEWORK
public E peek() { return list.get(0); } public E poll() { if (list.isEmpty()) { return null; } else { return list.remove(0); } } public int size() { return list.size(); } }
[CHAP. 4
33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48
The output is:
[AR, BO, CO, EC] [BO, CO, EC] Removed AR [BO, CO, EC, PE] [CO, EC, PE] Removed BO The LinkedQueue class uses a LinkedList to store its elements at line 18. This is called composition of classes; a LinkedQueue object is composed of a LinkedList object. It allows the composing class s methods to be implemented using the component class s methods. Thus, offer() uses list.add() at line 28, peek() uses list.get() at line 34, poll() uses list.remove() at line 41, and size() uses list.size() at line 46.
The action of the main() method illustrates the FIFO nature of a queue: Insert elements at the back and remove them from the front. Thus, the first in (AR) was the first out (at line 6), and the second in (BO) was the second out (at line 11).
THE PriorityQueue CLASS A priority queue is the same as an ordinary queue except for its removal algorithm: Instead of removing the element that has been in the queue the longest, it removes the element that has the highest priority. This of course, requires its elements to be prioritized. In other words, the elements have to have some ordering mechanism; either a natural order, such as alphabetic order for strings, or an order imposed by a Comparator object. (See page 79.) The PriorityQueue class extends the AbstractQueue class, implementing the Queue interface. To accommodate the priority protocol, it includes a constructor for specifying a Comparator, a constructor for specifying a SortedSet source of elements, and an accessor method for obtaining the elements comparator:
PriorityQueue(int initialCapacity, Comparator< super E> comparator) PriorityQueue(SortedSet< extends E> c) Comparator< super E> comparator() Note that the first of these two constructors requires the collection s initialCapacity to be specified. That is because the PriorityQueue class is implemented with a heap data structure,
which uses an array to store its elements. (See 13.)
CHAP. 4]
Copyright © OnBarcode.com . All rights reserved.