java获取时间段内的月份

//时间段内的月份
public static void main(String[] args) {
      String y1 = "2021-11";// 开始时间
      String y2 = "2022-05";// 结束时间
    try {
            Date startDate = new SimpleDateFormat("yyyy-MM").parse(y1); //开始时间 y1 2021-11
            Date endDate = new Date();  //结束时间 当前时间  2022-05

            Calendar calendar = Calendar.getInstance();
            calendar.setTime(startDate);
            // 获取开始年份和开始月份
            int startYear = calendar.get(Calendar.YEAR);
            int startMonth = calendar.get(Calendar.MONTH);
            // 获取结束年份和结束月份
            calendar.setTime(endDate);
            int endYear = calendar.get(Calendar.YEAR);
            int endMonth = calendar.get(Calendar.MONTH);
            //
            List<String> list = new ArrayList<String>();
            for (int i = startYear; i <= endYear; i++) {
                String date = "";
                if (startYear == endYear) {
                    for (int j = startMonth; j <= endMonth; j++) {
                        if (j < 9) {
                            date = i + "-0" + (j + 1);
                        } else {
                            date = i + "-" + (j + 1);
                        }
                        list.add(date);
                    }

                } else {
                    if (i == startYear) {
                        for (int j = startMonth; j < 12; j++) {
                            if (j < 9) {
                                date = i + "-0" + (j + 1);
                            } else {
                                date = i + "-" + (j + 1);
                            }
                            list.add(date);
                        }
                    } else if (i == endYear) {
                        for (int j = 0; j <= endMonth; j++) {
                            if (j < 9) {
                                date = i + "-0" + (j + 1);
                            } else {
                                date = i + "-" + (j + 1);
                            }
                            list.add(date);
                        }
                    } else {
                        for (int j = 0; j < 12; j++) {
                            if (j < 9) {
                                date = i + "-0" + (j + 1);
                            } else {
                                date = i + "-" + (j + 1);
                            }
                            list.add(date);
                        }
                    }

                }

            }

            // 所有的月份已经准备好
            //System.out.println(list);
            for(int i = 0;i < list.size();i++){
                System.out.println(list.get(i));
            }

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