Java - 将字节转换为兆字节

Question

我这里有以下代码:

long memoryUsedOnStartup = Runtime.getRuntime().totalMemory() -
Runtime.getRuntime().freeMemory();

我在程序中使用它来进行一些统计工作，但这会以千字节为单位返回它。有没有可靠的方法可以将其转换为兆字节？

编辑:它以字节为单位返回它，但我仍然需要它以兆字节为单位......

Answer 1

1 Kilobyte (KB) -> 2^10 = 1,024 Bytes

1 Megabyte (MB) -> 2^20 = 1,048,576 Bytes = 1,024 Kilobytes (KB)

public long freeMemory()

Return: an approximation to the total amount of memory currently available for future allocated objects, measured in bytes.

public long totalMemory()

Returns: the total amount of memory currently available for current and future objects, measured in bytes.

因此，当您计算memoryUsedOnStartup时，它以字节为单位。如果您想获得以兆字节为单位的结果，则需要将其除以(1024 * 1024)