此 C# 代码在 Java 中的等价物是什么？
int tick = 0;
tick = Environment.TickCount;
Java 中没有让系统正常运行的标准方法。如果您知道自己使用的是类 Unix 系统，则可以使用：
Runtime.getRuntime().exec('uptime');
或者可以读取系统文件：
new Scanner(new FileInputStream("/proc/uptime")).next();
在某些系统上，这也将是
System.nanoTime()System.nanoTime()如果您想要这样做的唯一原因是测量经过的时间，您可以使用
System.nanoTime()System.currentTimeMillis()正如 @TedHopp 提到的，一种可能性是使用 System.currentTimeMillis()。就我而言，我想要以秒为单位的“滴答计数”，而不是毫秒。以下是我目前使用的相应 C# 方法的 Java 版本。
// Static field used by the tickCountInSeconds() method
private static long _firstCallTimeSeconds = 0;
...
/**
* Method to get an arbitrary constantly increasing time in seconds, i.e., a time in seconds that
* can be used to compare the relative times of two events, but without having any other meaning.
*
* The .Net version of this method uses the Windows "tick count" facility, but since that doesn't
* exist in Java we fake it by getting the system (Unix-style) time in milliseconds and
* converting it to seconds. But to avoid the "year 2038 problem" (or to avoid criticism for
* creating a year 2038 vulnerability) the time of the first call is saved in a static field and
* subtracted from the returned result.
*/
private synchronized static int tickCountInSeconds() {
long currentTimeSeconds = System.currentTimeMillis() / 1000L;
if (_firstCallTimeSeconds == 0) {
_firstCallTimeSeconds = currentTimeSeconds;
}
return (int)(currentTimeSeconds - _firstCallTimeSeconds);
}
/** A different way to get this information in Tomcat JSP is as such: */
<%@ page import="java.lang.System.*" %>
<body>
<%
long uptime = ((System.nanoTime()) / 1000000);
int days = (int) Math.floor(uptime / 86400000);
int hours = (int) Math.floor((uptime % 86400000) / 3600000);
int minutes = (int) Math.floor((uptime % 3600000) / 60000);
int seconds = (int) Math.floor((uptime % 60000) / 1000);
int decpart = (int) (uptime % 1);
String struptime = "Days: " + days + ", HMS: " + hours + ":" + minutes +
":" + seconds;
%>
</body>
/**
The Variable - struptime - can be directly used in a Paragraph, Table or
the line can be modified to any use.
Andrew Bindner
*/