How to paginate in java

public class Page {
 
    private long totalCount = 0;// 总记录数
    private int pageNumber = 1;//  当前页号，默认显示第一页
    private int pageSize = 20; // 每页大小，默认每页20条
    private int totalPage = 0;// 总页数，默认为0
    private int startRow = 0;// 起始记录行号，默认为从表头开始
 
    /**
    * 分页计算方法，由setTotalCount调用
    */
    public void pagination() {
                // 计算总页数
        if (this.totalCount % pageSize == 0)
            this.totalPage = new Long(this.totalCount / pageSize).intValue();
        else
            this.totalPage = new Long(this.totalCount / pageSize).intValue() + 1;
                // 排除错误页号
        if (this.pageNumber < 1)
            this.pageNumber = 1;
        if (this.pageNumber > this.totalPage)
            this.pageNumber = this.totalPage;
                // 计算起始行号
        this.startRow = (this.pageNumber - 1) * this.pageSize;
    }
    public long getTotalCount() {
        return totalCount;
    }
    public void setTotalCount(long totalCount) {
        this.totalCount = totalCount;
        this.pagination();
    }
    public int getPageNumber() {
        return pageNumber;
    }
    public void setPageNumber(int pageNumber) {
        this.pageNumber = pageNumber;
    }
    public int getPageSize() {
        return pageSize;
    }
    public void setPageSize(int pageSize) {
        this.pageSize = pageSize;
    }
    public int getTotalPage() {
        return totalPage;
    }
    public void setTotalPage(int totalPage) {
        this.totalPage = totalPage;
    }
    public int getStartRow() {
        return startRow;
    }
    public void setStartRow(int startRow) {
        this.startRow = startRow;
    }
}