/**     * 获取指定年月的第一天     *     * @param year     * @param month     * @return     */    public static String getFirstDayOfMonth1(int year, int month) {        Calendar cal = Calendar.getInstance();        //设置年份        cal.set(Calendar.YEAR, year);        //设置月份        cal.set(Calendar.MONTH, month - 1);        //获取某月最小天数        int firstDay = cal.getMinimum(Calendar.DATE);        //设置日历中月份的最小天数        cal.set(Calendar.DAY_OF_MONTH, firstDay);        //格式化日期        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");        return sdf.format(cal.getTime());    }    /**     * 获取指定年月的最后一天     *     * @param year     * @param month     * @return     */    public static String getLastDayOfMonth1(int year, int month) {        Calendar cal = Calendar.getInstance();        //设置年份        cal.set(Calendar.YEAR, year);        //设置月份        cal.set(Calendar.MONTH, month - 1);        //获取某月最大天数        int lastDay = cal.getActualMaximum(Calendar.DATE);        //设置日历中月份的最大天数        cal.set(Calendar.DAY_OF_MONTH, lastDay);        //格式化日期        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");        return sdf.format(cal.getTime());    }