java获取当前月的上个月

 /**
     * 获取当前月的上一个月
     * @return
     */
    public static String getLastMonth() {
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM");
        Date date = new Date();
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date); // 设置为当前时间
        calendar.add(Calendar.MONTH,-1);
        date = calendar.getTime();
        String accDate = format.format(date);
        return accDate;
    }