[java] get OS-level system information

sample 1:

well as mentioned above, you can try them. By the way after getting connected you can use following codes:(if you wish)

 import java.util.Properties;
  public class GetCompleteSystemInfo {

public static void main(String args[]) {
    //1.Get Java Runtime
    Runtime runtime = Runtime.getRuntime();
    System.out.println("Runtime=" + Runtime.getRuntime());

    //2. Get Number of Processor availaible to JVM
    int numberOfProcessors = runtime.availableProcessors();
    System.out.println(numberOfProcessors + " Processors ");

    //2. Get FreeMemory, Max Memory and Total Memory
    long freeMemory = runtime.freeMemory();
    System.out.println("Bytes=" + freeMemory + " |KB=" + freeMemory / 1024 + " |MB=" + (freeMemory / 1024) / 1024+" Free Memory in JVM");

    long maxMemory = runtime.maxMemory();
    System.out.println(maxMemory + "-Bytes " + maxMemory / 1024 + "-KB  " + (maxMemory / 1024) / 1024 + "-MB " + " Max Memory Availaible in JVM");

    long totalMemory = runtime.totalMemory();
    System.out.println(totalMemory + "-Bytes " + totalMemory / 1024 + "-KB " + (totalMemory / 1024) / 1024 + "-MB " + " Total Memory Availaible in JVM");


    //3. Suggest JVM to Run Garbage Collector
    runtime.gc();

    //4. Suggest JVM to Run Discarded Object Finalization
    runtime.runFinalization();

    //5. Terminate JVM
    //System.out.println("About to halt the current jvm");//not to be run always
    //runtime.halt(1);
    // System.out.println("JVM Terminated");

    //6. Get OS Name
    String strOSName = System.getProperty("os.name");
    if (strOSName != null) {
        if (strOSName.toLowerCase().indexOf("windows") != -1) {
            System.out.println("This is "+strOSName);
        } else {
            System.out.print("Can't Determine");
        }
    }

    //7. Get JVM Spec
    String strJavaVersion = System.getProperty("java.specification.version");
    System.out.println("JVM Spec : " + strJavaVersion);
    //8. Get Class Path
    String strClassPath = System.getProperty("java.class.path");
    System.out.println("Classpath: " + strClassPath);

    //9. Get File Separator
    String strFileSeparator = System.getProperty("file.separator");
    System.out.println("File separator: " + strFileSeparator);

    //10. Get System Properties
    Properties prop = System.getProperties();
    System.out.println("System Properties(detail): " + prop);

    //11. Get System Time
    long lnSystemTime = System.currentTimeMillis();
    System.out.println("Milliseconds since midnight, January 1, 1970 UTC : " + lnSystemTime + "\nSecond=" + lnSystemTime / 1000 + "\nMinutes=" + (lnSystemTime / 1000) / 60 + ""
            + "\nHours=" + ((lnSystemTime / 1000) / 60) / 60 + "\nDays=" +   (((lnSystemTime / 1000) / 60) / 60) / 24 + "\nYears=" + ((((lnSystemTime / 1000) / 60) /  60) / 24) / 365);
      }
   }

sample 2:

You can get some limited memory information from the Runtime class. It really isn’t exactly what you are looking for, but I thought I would provide it for the sake of completeness. Here is a small example. Edit: You can also get disk usage information from the java.io.File class. The disk space usage stuff requires Java 1.6 or higher.

public class Main {
  public static void main(String[] args) {
    /* 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 available to the JVM */
    System.out.println("Total memory available to JVM (bytes): " + 
        Runtime.getRuntime().totalMemory());

    /* Get a list of all filesystem roots on this system */
    File[] roots = File.listRoots();

    /* For each filesystem root, print some info */
    for (File root : roots) {
      System.out.println("File system root: " + root.getAbsolutePath());
      System.out.println("Total space (bytes): " + root.getTotalSpace());
      System.out.println("Free space (bytes): " + root.getFreeSpace());
      System.out.println("Usable space (bytes): " + root.getUsableSpace());
    }
  }
}

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