java怎么读取jvm内存

在Java中，可以使用ManagementFactory类来读取JVM内存信息。下面是一个示例代码：

import java.lang.management.ManagementFactory; import java.lang.management.MemoryMXBean; import java.lang.management.MemoryUsage;  public class JVMMemoryReader {     public static void main(String[] args) {         MemoryMXBean memoryMXBean = ManagementFactory.getMemoryMXBean();         MemoryUsage heapMemoryUsage = memoryMXBean.getHeapMemoryUsage();         MemoryUsage nonHeapMemoryUsage = memoryMXBean.getNonHeapMemoryUsage();          System.out.println("Heap Memory Usage:");         System.out.println("   Init: " + heapMemoryUsage.getInit());         System.out.println("   Used: " + heapMemoryUsage.getUsed());         System.out.println("   Committed: " + heapMemoryUsage.getCommitted());         System.out.println("   Max: " + heapMemoryUsage.getMax());          System.out.println("Non-Heap Memory Usage:");         System.out.println("   Init: " + nonHeapMemoryUsage.getInit());         System.out.println("   Used: " + nonHeapMemoryUsage.getUsed());         System.out.println("   Committed: " + nonHeapMemoryUsage.getCommitted());         System.out.println("   Max: " + nonHeapMemoryUsage.getMax());     } } 

运行上述代码会输出JVM的堆内存和非堆内存的使用情况。