java中日期格式转换(将字符串毫秒数转换为Date格式)android studio 通用

/输入毫秒数，转化为日期，用calendar方法；
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(time);
int year = calendar.get(Calendar.YEAR);
int month = calendar.get(Calendar.MONTH);
int day = calendar.get(Calendar.DAY_OF_MONTH);
int hour = calendar.get(Calendar.HOUR_OF_DAY);//24小时制
int hour = calendar.get(Calendar.HOUR);//12小时制
int minute = calendar.get(Calendar.MINUTE);
int second = calendar.get(Calendar.SECOND);

    System.out.println(year + "年" + (month + 1) + "月" + day + "日"  
            + hour + "时" + minute + "分" + second + "秒");