java - 使用 Java 将一组月份转换为几天

Question

我正在尝试制作一种方法，您可以在其中输入参数、当前月份和要追溯的月份数量，并将所有这些转换为天数。例如，如果当前月份是 1 月，我想将过去 5 个月转换为天数，答案将是 153。我有以下信息可供使用。

    private Calendar cal;

    private int currentMonth;

    private final int JANUARY = 31;
    private final int FEBRUARY = 28;
    private final int MARCH = 31;
    private final int APRIL = 30;
    private final int MAY = 31;
    private final int JUNE = 30;
    private final int JULY = 31;
    private final int AUGUST = 31;
    private final int SEPTEMBER = 30;
    private final int OCTOBER = 31;
    private final int NOVEMBER = 30;
    private final int DECEMBER = 31;

    public Constructor(){
        cal = new GregorianCalendar();
        currentMonth = cal.get(Calendar.MONTH);
    }


    private int convertMonthsToDays(int currentMonth, int months){
        int days;
        return days;
}

Answer 1

将此代码用于您想要的

package test;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.hibernate.Criteria;
import org.hibernate.Session;
import org.hibernate.criterion.Restrictions;

import com.ibm.icu.util.Calendar;
import com.ibm.icu.util.GregorianCalendar;
import com.mPower.fw.dao.ClassMaster;
import com.mPower.fw.impl.DaoServiceIMPL;
import com.mPower.fw.util.hibernateUtil;

public class runT {

    public static void main(String[] args) throws IOException {
        try{
            Calendar calendar = new GregorianCalendar();
            int CURRENT_MONTH = 0;
            int MONTH_BACK = 5;

            int totalDays = 0;

        calendar.set(Calendar.MONTH, CURRENT_MONTH);

            for(int i=0;i<MONTH_BACK;i++){
                totalDays += calendar.getMaximum(java.util.Calendar.DAY_OF_MONTH);
                calendar.add(Calendar.MONTH, -1);
            }

            System.out.println(totalDays);

        }catch(Exception e){
            e.printStackTrace();
        }
    }

}

使用 calendar.add(Calendar.MONTH, -1);一个月前。

使用 calendar.add(Calendar.MONTH, 1); future 一个月。