如何从Java程序中获取JVM的最小和最大堆大小设置


问题内容

如何从Java程序中获取VM的最小和最大堆大小设置?


问题答案:

最大堆大小:

Runtime.getRuntime().maxMemory();

您可能会发现一些有趣的其他计算:

Runtime runtime = Runtime.getRuntime();
long maxMemory = runtime.maxMemory();
long allocatedMemory = runtime.totalMemory();
long freeMemory = runtime.freeMemory();
long totalFreeMemory = freeMemory + (maxMemory - allocatedMemory);
long usedMemory = maxMemory - totalFreeMemory;