How do I find the physical memory size in Java?

Question

I\'m writing an installer that will tune the configuration of the product for the particular hardware on which it will be run. In particular, I want to determine how much p

Answer 1

import java.lang.management.ManagementFactory;

import javax.management.AttributeNotFoundException;
import javax.management.InstanceNotFoundException;
import javax.management.MBeanException;
import javax.management.MBeanServer;
import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;
import javax.management.ReflectionException;

public class Main {
  public static void main(String[] args) throws InstanceNotFoundException, AttributeNotFoundException, MalformedObjectNameException, ReflectionException, MBeanException  {
  /* Total number of processors or cores available to the JVM */


      MBeanServer mBeanServer = ManagementFactory.getPlatformMBeanServer();
      Object attribute = mBeanServer.getAttribute(new ObjectName("java.lang","type","OperatingSystem"), "TotalPhysicalMemorySize");
      Object attribute2 = mBeanServer.getAttribute(new ObjectName("java.lang","type","OperatingSystem"), "FreePhysicalMemorySize");
      System.out.println("Total memory: "+ Long.parseLong(attribute.toString()) / 1024  +"MB");
      System.out.println("Free  memory: "+ Long.parseLong(attribute2.toString()) / 1024  +"MB");    

 }
}