Java实现日期随意跳转

项目开发过程中。须要进行订单提醒日期的设置。主要包含设置每月指定的日期或者指定的天数，代码例如以下：

public static String DateOperation(String type, Date myDate, int num) {

String date = null;

SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMdd");

try {

Calendar c = Calendar.getInstance();

c.setTime(myDate);

if (type.equals("0")){

c.add(Calendar.MONTH, 1);

myDate = c.getTime();

date = formatter.format(myDate);

String dt = date.substring(date.length()-2,date.length());

System.out.println("截取后的日期:[" + dt + "]");

int days = num - Integer.parseInt(dt);

System.out.println("相差天数:" + days);

c.add(Calendar.DATE, days);

myDate = c.getTime();

date = formatter.format(myDate);

}else if (type.equals("1")){

c.add(Calendar.DATE, num);

myDate = c.getTime();

date = formatter.format(myDate);

}

System.out.println("订单下次提醒日期:[" + date + "]");

} catch (Exception e1) {

e1.printStackTrace();

}

return date;

}