package day01;

import java.util.ArrayList;
import java.util.List;

/**
 * List分頁測試
 * 
 * @author Jandy 2011-6-7 14:50:25
 */
public class Page {

	public static void main(String[] args) throws Exception {
		List<Object> p = new ArrayList<Object>();
		for (int i = 1; i <= 10; i++) {
			p.add(i);
			System.out.println(i + "-" + p.get(i - 1));
		}
		List<Object> result = page(3, 15, p);
		for (int i = 0; i < result.size(); i++) {
			System.out.println(result.get(i));
		}
	}

	/**
	 * @param pageNo 當前頁碼
	 * @param pageSize 頁數
	 * @param list 所有集合
	 * @return
	 * @throws Exception
	 */
	public static List<Object> page(int pageNo, int pageSize, List<Object> list)throws Exception {
		List<Object> result = new ArrayList<Object>();
		if (list != null && list.size() > 0) {
			int allCount = list.size();
			int pageCount = (allCount + pageSize - 1) / pageSize;
			if (pageNo >= pageCount) {
				pageNo = pageCount;
			}
			int start = (pageNo - 1) * pageSize;
			int end = pageNo * pageSize;
			if (end >= allCount) {
				end = allCount;
			}
			for (int i = start; i < end; i++) {
				result.add(list.get(i));
			}
		}
		return (result != null && result.size() > 0) ? result : null;
	}
}