package cn.edu.cauc.crab.ossimulate;import java.util.*;/** * <p>Title: OS simulate</p> * <p>Description: This is my home work.</p> * <p>Copyright: Copyleft (c) 2004</p> * <p>Company: CAUC</p> * @author Crab * @version 0.1 *//** * page be used for page replacement. * * @author Crab * @version 0.1 */class Page {    int number;// the page number}/** * To simulate page replacement. * * @author Crab * @version 0.1 */abstract public class PageReplacement {    List memory;    int memoryBig;    List pageList;    /** Construct a PageReplacement.     * @param memoryBig set the page number of the memory.     */    public PageReplacement(int memoryBig) {        this.memoryBig = memoryBig;        memory = new LinkedList();        pageList = new LinkedList();    }    /**     * add a page with the number to pageList.     * @param number     */    public void addPage(int number) {        Page page = new Page();        page.number = number;        pageList.add(page);    }    abstract public void start();    boolean inMemory(Page page) {        Iterator p = memory.iterator();        while (p.hasNext()) {            Page pg = (Page)p.next();            if (pg.number == page.number) {                reuturn true;            }        }        return false;    }    /*    public static void main(String[] args) {        PageReplacement p = new PageReplacement(3);        System.out.println("" + p.memoryBig);        p.addPage(3);        Page page = new Page();        page.number = 3;        Page page1 = new Page();        page1.number = 3;        p.pageList.add(page);        System.out.println("" + p.pageList.contains(page1));    }*/}