JAVA----List 简单分页工具方法_private list data; private int total;

List 简单分页工具方法 ListPageUtils

public class ListPageUtils<T> {
    private List<T> data;
    private int lastPage;
    private int currentPage;
    private int nextPage;
    private int pageSize;
    private int totalPage;
    private int totalCount;

    public ListPageUtils(List<T> data, int currentPage, int pageSize) {
        if (data == null || data.isEmpty()) {
            throw new IllegalArgumentException("data must be not empty!");
        }

        this.data = data;
        this.pageSize = pageSize;
        this.currentPage = currentPage;
        this.totalCount = data.size();
        this.totalPage = (totalCount + pageSize - 1) / pageSize;
        this.lastPage = currentPage - 1 > 1 ? currentPage - 1 : 1;
        this.nextPage = currentPage >= totalPage ? totalPage : currentPage + 1;

    }

    /**
     * 得到分页后的数据
     *
     * @return 分页后结果
     */
    public int getPageSize() {
        return pageSize;
    }

    public List<T> getData() {
        int fromIndex = (currentPage - 1) * pageSize;
        if (fromIndex >= data.size()) {
            return Collections.emptyList();//空数组
        }
        if (fromIndex < 0) {
            return Collections.emptyList();//空数组
        }
        int toIndex = currentPage * pageSize;
        if (toIndex >= data.size()) {
            toIndex = data.size();
        }
        return data.subList(fromIndex, toIndex);
    }

    public int getLastPage() {
        return lastPage;
    }

    public int getCurrentPage() {
        return currentPage;
    }

    public int getNextPage() {
        return nextPage;
    }

    public int getTotalPage() {
        return totalPage;
    }

    public int getTotalCount() {
        return totalCount;
    }
}