獲取兩個日期間的所有月份

獲取兩個日期間的所有月份

public void getMonthOfYear() throws ParseException {
    	
    	String dateString1 = "2019-01";//開始日期，格式要根據getInitMonthMapWithZero2方法中的日期轉換格式匹配上
    	String dateString2 = "2020-09";//結束日期
    	
    	List<String> list = new ArrayList<String>();
    	
    	List<String> initMonthMapWithZero2 = getInitMonthMapWithZero2(list,dateString1,dateString2);
    	for (String string : initMonthMapWithZero2) {
			System.out.println(string);
		}
    	
    }

public List<String> getInitMonthMapWithZero2(List<String> myList,String beginTime,String endTime) throws ParseException {
    	List<String> list = myList;
    	
    	DateFormat dateFormat = new SimpleDateFormat("yyyy-MM");
    	Date endDate = dateFormat.parse(endTime);
    	
    	if(!myList.contains(beginTime)) {
    		Calendar c = Calendar.getInstance();
    		c.setTime(endDate);
    		for(int i = 0; i < 12; i ++){
    			int k = c.get(Calendar.YEAR);
    			int j = c.get(Calendar.MONTH) + 1 - i;
    			String date = "";
    			if(j >= 1){
    				date = k + "-" + (j >= 10 ? "" : "0") + j;
    			}else {
    				int p = 11 - i;//剩餘循環次數
    				int m = c.get(Calendar.YEAR) - 1;
    				int n = c.get(Calendar.MONTH) + 2 + p;
    				date = m + "-" + (n >= 10 ? "" : "0") + n;
    			}
    			
    			if(list.contains(endTime)&&endTime.equals(date)) {
    				continue;
    			}else {
    				list.add(date);
    			}
    			if(date.equals(beginTime)) {
    				return list;
    			}
    		}
    		
    		getInitMonthMapWithZero2(list,beginTime,list.get(list.size()-1));
    		
    	}

得到結果：
2020-09
2020-08
2020-07
2020-06
2020-05
2020-04
2020-03
2020-02
2020-01
2019-12
2019-11
2019-10
2019-09
2019-08
2019-07
2019-06
2019-05
2019-04
2019-03
2019-02
2019-01