專案開發中，碰見每週更新三道題的需求，不能多於三道題

package test;

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.List;

public class Test {

	// 獲得本週一與當前日期相差的天數
    public static  int getMondayPlus() {
        Calendar cd = Calendar.getInstance();
        int dayOfWeek = cd.get(Calendar.DAY_OF_WEEK);
        //由於Calendar提供的都是以星期日作為週一的開始時間
        if (dayOfWeek == 1) {
            return -6;
        } else {
            return 2 - dayOfWeek;
        }
    }
    
    // 獲得當前周- 週一的日期
    public static  Long getCurrentMonday() {
        int mondayPlus = getMondayPlus();
        GregorianCalendar currentDate = new GregorianCalendar();
        currentDate.add(GregorianCalendar.DATE, mondayPlus);
        Date monday = currentDate.getTime();
        return monday.getTime();
    }
    
    // 獲得當前周- 週日  的日期
    public static Long  getPreviousSunday() {
        int mondayPlus = getMondayPlus();
        GregorianCalendar currentDate = new GregorianCalendar();
        currentDate.add(GregorianCalendar.DATE, mondayPlus +6);
        Date monday = currentDate.getTime();
        return monday.getTime();
    }


    public static void main(String[] args) throws Exception {
    	
        Long start = Test.getCurrentMonday();
        Long end = Test.getPreviousSunday();
        //模擬查出最新的3個
        List<String> list = new ArrayList<String>();
        list.add("2018-07-30 23:30:01");
        list.add("2018-07-30 14:30:27");
        list.add("2018-07-31 13:50:55");
        boolean flag = false;
        for(int i=0;i<list.size();i++){
        	Date date = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(list.get(i).toString());
        	if(date.getTime() > start && date.getTime() < end){}else{flag = true; break;}
        }
        if(flag){
        	System.out.println("可以建立");
        }else{
        	System.out.println("不能再建立");
        }
    }
    
}