package com.fs.utils;

public class DateUtils {
    public  static java.sql.Date changeDate(java.util.Date date){
        if (date ==null){
            throw new RuntimeException("date不能为空："+date);

        }
        return new java.sql.Date(date.getTime());


    }
}
//用如下测试

import com.fs.utils.DateUtils;

import java.util.Date;

public class test {
    public static void main(String[] args) {
        Date utilDate =new Date();
        java.sql.Date sqlDate = DateUtils.changeDate(utilDate);
        System.out.println(java.util.Date.class.isInstance(utilDate));
        System.out.println(java.util.Date.class.isInstance(sqlDate));
        System.out.println(java.sql.Date.class.isInstance(sqlDate));
        System.out.println(java.sql.Date.class.isInstance(utilDate));

    }
}