我在 Java 中使用毫秒进行一些日期计算,并注意到以下问题:
private static final int MILLIS_IN_SECOND = 1000;
private static final int SECONDS_IN_MINUTE = 60;
private static final int MINUTES_IN_HOUR = 60;
private static final int HOURS_IN_DAY = 24;
private static final int DAYS_IN_YEAR = 365; //I know this value is more like 365.24...
private static final long MILLISECONDS_IN_YEAR = MILLIS_IN_SECOND * SECONDS_IN_MINUTE * MINUTES_IN_HOUR * HOURS_IN_DAY * DAYS_IN_YEAR;
System.out.println(MILLISECONDS_IN_YEAR); //Returns 1471228928
我知道 1 年大约 = 31,556,952,000 毫秒,所以我的乘法以某种方式关闭了。
谁能指出我做错了什么?我应该使用long吗?
最佳答案
Should I be using a long?
是的。问题是,由于 MILLIS_IN_SECOND
等等都是 int
,当你将它们相乘时,你会得到一个 int
。您正在将该 int
转换为 long
,但只有 after int
乘法已经导致错误回答。
要解决此问题,您可以将第一个转换为 long
:
private static final long MILLISECONDS_IN_YEAR =
(long)MILLIS_IN_SECOND * SECONDS_IN_MINUTE * MINUTES_IN_HOUR
* HOURS_IN_DAY * DAYS_IN_YEAR;
关于一年中的 Java 毫秒数,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/9141871/