How to get System Information using Java?

import java.net.InetAddress; import java.net.NetworkInterface; import java.net.SocketException; import java.net.UnknownHostException; public class Test { public static void main(String[] args) { InetAddress ip; try { ip = InetAddress.getLocalHost(); System.out.println("Current host name : " + ip.getHostName()); System.out.println("Current IP address : " + ip.getHostAddress()); String nameOS = System.getProperty("os.name"); System.out.println("Operating system Name=>" + nameOS); String osType = System.getProperty("os.arch"); System.out.println("Operating system type =>" + osType); String osVersion = System.getProperty("os.version"); System.out.println("Operating system version =>" + osVersion); System.out.println(System.getenv("PROCESSOR_IDENTIFIER")); System.out.println(System.getenv("PROCESSOR_ARCHITECTURE")); System.out.println(System.getenv("PROCESSOR_ARCHITEW6432")); System.out.println(System.getenv("NUMBER_OF_PROCESSORS")); /* Total number of processors or cores available to the JVM */ System.out.println("Available processors (cores): " + Runtime.getRuntime().availableProcessors()); /* Total amount of free memory available to the JVM */ System.out.println("Free memory (bytes): " + Runtime.getRuntime().freeMemory()); /* This will return Long.MAX_VALUE if there is no preset limit */ long maxMemory = Runtime.getRuntime().maxMemory(); /* Maximum amount of memory the JVM will attempt to use */ System.out.println("Maximum memory (bytes): " + (maxMemory == Long.MAX_VALUE ? "no limit" : maxMemory)); /* Total memory currently in use by the JVM */ System.out.println("Total memory (bytes): " + Runtime.getRuntime().totalMemory()); NetworkInterface network = NetworkInterface.getByInetAddress(ip); byte[] mac = network.getHardwareAddress(); System.out.print("Current MAC address : "); StringBuilder sb = new StringBuilder(); for (int i = 0; i < mac.length; i++) { sb.append(String.format("%02X%s", mac[i], (i < mac.length - 1) ? "-" : "")); } System.out.println(sb.toString()); } catch (UnknownHostException e) { e.printStackTrace(); } catch (SocketException e) { e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } } }

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