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Queue

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Submitted on: 6/30/2003 8:51:45 AM
By: Fabian Jones 
Level: Beginner
User Rating: By 1 Users
Compatibility: Java (JDK 1.2)
Views: 6876
(About the author)
 
     This is a simple implementation of a FIFO Queue using a ArrayList delegate.
 
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//**************************************
// Name: Queue
// Description:This is a simple implementation of a FIFO Queue using a ArrayList delegate.
// By: Fabian Jones
//
//This code is copyrighted and has// limited warranties.Please see http://www.Planet-Source-Code.com/vb/scripts/ShowCode.asp?txtCodeId=3666&lngWId=2//for details.//**************************************

/*
 * Implementation of a polymorphic FIFO queue.
 */
import java.util.*;
public class Queue{
 private static int DEFAULT_CAPACITY = 8;
 private List elements;
 public Queue(){
 this(DEFAULT_CAPACITY);
 }
 public Queue(int capacity){
 elements = new ArrayList(capacity);
 }
 public void enqueue(Object o){
 elements.add(o);
 }
 public Object peek(){
 return elements.get(0);
 }
 public Object dequeue(){
 return elements.remove(0);
 }
 public boolean isEmpty(){
 return elements.isEmpty();
 }
 /******************Overloaded Object Methods******************/
 public boolean equals(Object o){
 if(o instanceof Queue){
Queue q = (Queue) o;
return q.elements.equals(this.elements);
 }
 return false;
 }
 public String toString(){
 return elements.toString();
 }
 public int hashCode(){
 return elements.hashCode();
 }
}


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7/2/2003 2:11:13 PMFabian Jones

Please leave a comment, I would like to know what others think. Thank you.
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