java list 分页，方便分批处理整个list的数据

java list 分页，方便分批处理整个list的数据

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import java.util.Arrays; import java.util.Collections; import java.util.List;   public class ListPageUtil<T> {            /**       * 每页显示条数       */      private int pageSize;            /**       * 总页数       */      private int pageCount;            /**       * 原集合       */      private List<T> data;        public ListPageUtil(List<T> data, int pageSize) {          if (data == null || data.isEmpty()) {              throw new IllegalArgumentException( "data must be not empty!" );          }            this .data = data;          this .pageSize = pageSize;          this .pageCount = data.size()/pageSize;          if (data.size()%pageSize!= 0 ){              this .pageCount++;          }      }        /**       * 得到分页后的数据       *       * @param pageNum 页码       * @return 分页后结果       */      public List<T> getPagedList( int pageNum) {          int fromIndex = (pageNum - 1 ) * pageSize;          if (fromIndex >= data.size()) {              return Collections.emptyList();          }            int toIndex = pageNum * pageSize;          if (toIndex >= data.size()) {              toIndex = data.size();          }          return data.subList(fromIndex, toIndex);      }        public int getPageSize() {          return pageSize;      }        public List<T> getData() {          return data;      }        public int getPageCount() {          return pageCount;      }        public static void main(String[] args) {          Integer[] array = { 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 };          List<Integer> list = Arrays.asList(array);            ListPageUtil<Integer> pager = new ListPageUtil<Integer>(list, 10 );                   System.out.println(pager.getPageCount());            List<Integer> page1 = pager.getPagedList( 1 );          System.out.println(page1);            List<Integer> page2 = pager.getPagedList( 2 );          System.out.println(page2);            List<Integer> page3 = pager.getPagedList( 3 );          System.out.println(page3);      } }

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