问题：从当前月份开始，往前3年的所有月份

返回map类型，key是String，value是Date，map倒序排列

public static Map<String, Date> getDateMap() {
    Map<String, Date> map = new LinkedHashMap<>();
    Calendar c = Calendar.getInstance();
    for (int i = 0; i < 36; i++) {
        map.put(c.get(Calendar.YEAR) + "年" + (c.get(Calendar.MONTH) + 1) + "月" , c.getTime());
        c.add(Calendar.MONTH,-1);
    }
    return map;
}

public static void main(String[] args) {
    Map<String, Date> map = getDateMap();
    for (Map.Entry<String, Date> tmp : map.entrySet()) {
        System.out.println(tmp.getKey());
        System.out.println(tmp.getValue());
    }
}

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