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以下是一个用Java代码实现分页功能的示例:
public class Pagination { private int currentPage; private int pageSize; private int totalRecords; public Pagination(int currentPage, int pageSize, int totalRecords) { this.currentPage = currentPage; this.pageSize = pageSize; this.totalRecords = totalRecords; } public int getTotalPages() { return (int) Math.ceil((double) totalRecords / pageSize); } public int getStartIndex() { return (currentPage - 1) * pageSize; } public int getEndIndex() { return Math.min(currentPage * pageSize, totalRecords); } }
在使用时,可以将总记录数、当前页数和每页显示的记录数传递给构造函数,然后使用getTotalPages
方法获取总页数,使用getStartIndex
和getEndIndex
方法获取当前页显示的记录的起始索引和结束索引。
示例用法:
public class Main { public static void main(String[] args) { int currentPage = 2; int pageSize = 10; int totalRecords = 37; Pagination pagination = new Pagination(currentPage, pageSize, totalRecords); int totalPages = pagination.getTotalPages(); int startIndex = pagination.getStartIndex(); int endIndex = pagination.getEndIndex(); System.out.println("总页数:" + totalPages); System.out.println("起始索引:" + startIndex); System.out.println("结束索引:" + endIndex); } }
运行结果:
总页数:4 起始索引:10 结束索引:20
这个示例中,总记录数为37,每页显示10条记录,当前页为第2页。所以总页数为4,当前页的起始索引为10,结束索引为20。