如何以编程方式确定JVM中可用的资源限制？

import java.lang.management.ManagementFactory;
import java.lang.management.RuntimeMXBean;
import com.sun.management.OperatingSystemMXBean;

RuntimeMXBean runtimeMxBean = ManagementFactory.getRuntimeMXBean();
OperatingSystemMXBean osMxBean = (OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();

int availableProcessors = osMxBean.getAvailableProcessors();
System.out.println("可用的CPU核心数: " + availableProcessors);

long maxMemory = runtimeMxBean.getMaxMemory();
System.out.println("JVM可用的最大内存: " + maxMemory + " bytes");

long totalPhysicalMemory = osMxBean.getTotalPhysicalMemorySize();
System.out.println("JVM可用的物理内存大小: " + totalPhysicalMemory + " bytes");

long totalVirtualMemory = osMxBean.getTotalSwapSpaceSize();
System.out.println("JVM可用的虚拟内存大小: " + totalVirtualMemory + " bytes");