java中简单的翻页功能的实现（PageManager）

package util;
import java.util.List;

public class PageManager
{
    private List allRecords = null;//collection储存同一类型的对象的集合
    private int currentPage = 0;//当前页码
    private int totalPage = 0;//总页数
    private int recordPerPage = -1;//每页的对象数
    private int totalCount=0;//总的对象数
 //初始化
 public PageManager(List allRecords, int recordPerPage)
    {
        if (allRecords == null || recordPerPage < 1) return;

        this.allRecords = allRecords;
        this.recordPerPage = recordPerPage;
        this.totalCount=allRecords.size();
        if (allRecords.size() % recordPerPage == 0)
        &nb