pagect.java

主要是描述的同学录系统

package com.page;
import java.util.*;

public class PageCt
{
private long l_start; //开始纪录
private long l_end; //结束纪录
private long l_curpage; //当前页数 
private long l_totalnum;//总记录数
private int int_num=5; //每页5条
private long l_totalpage; //总的页数

public void Init(long currentpage,long totalnum)
{
l_curpage = currentpage;
l_totalnum = totalnum;

if (currentpage>=0)
{
if (currentpage>=(long)Math.ceil((double)l_totalnum/(double)int_num))
l_curpage = (long)Math.floor((double)l_totalnum/(double)int_num);
else
l_curpage = currentpage;
}
else
{
l_curpage = 0;
}

l_start = l_curpage * int_num;
l_end = l_start + int_num;

if (l_end > l_totalnum)
l_end = l_totalnum;

l_totalpage = (long)Math.ceil((double)l_totalnum/(double)int_num); 

}

public long getCurpage()
{
return l_curpage;
}
public long getPrepage()
{
if (l_curpage-1>=0)
{
return l_curpage-1;
}
else
{
return 0;
}
}
public long getNextpage()
{
if (l_curpage+1<=l_totalpage)
{
return l_curpage+1;
}
else
{
return l_totalpage;
}
}
public long getTotalnum()
{
return l_totalnum;
}
public long getTotalpage()
{
return l_totalpage;
}
public long getStart()
{
return l_start;
}
public long getEnd()
{
return l_end;
}

};