queue.java

JSP聊天系统

package org.ehotsoft.yekki.sql.pool;

import java.util.Vector;

public class Queue {

	private Vector v;

	public Queue() {

		v = new Vector();
	}

	public Queue( int size ) {

		v = new Vector( size );
	}

	public synchronized Object dequeue() {

		if( empty() )
			return null;
		else {

		  Object o = v.firstElement();
		  v.removeElementAt( 0 );
		  return o;
		}
	}

	public void enqueue(Object o) {

		v.addElement(o);
	}

	public int size() {

		return v.size();
	}

	public boolean empty() {

		return v.size() < 1;
	}

}