command line process runtime system cmd

public class RunMain
{
    public static void main( String[] args )
    {
        OperatingSystem currentOS = new OperatingSystem();
        SystemCommand myCommand = null;

      if( currentOS.isLinux() )
      {
        //myCommand = new SystemCommand( "openssl version" );
        myCommand = new SystemCommand( "ifconfig" );
        System.out.println( "Before running the command: " + myCommand.returnLastCommandResult() );
        myCommand.run();
        System.out.println( "Command result: " + myCommand.returnLastCommandResult() );
      }
      else
      {     System.out.println( "WRONG OS" );
      }
    }
}


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import java.io.BufferedReader;
import java.io.InputStreamReader;

class SystemCommand
{
    private String command;
    private COMMANDRESULT result;

    private enum COMMANDRESULT
    {
        NOT_YET_RUN,
        NULL_COMMAND,
        EMPTY_COMMAND,
        ERROR,
        SUCCESS
    }

    SystemCommand( String cmd )
    {
        command = cmd;

        if( command == null )
        {       result = COMMANDRESULT.NULL_COMMAND;
        }
        else if( command != null )
        {
            if( command.isEmpty() )
            {       result = COMMANDRESULT.EMPTY_COMMAND;
            }else
            {       result = COMMANDRESULT.NOT_YET_RUN;
            }
        }
    } //end constructor()

    protected void run( )
    {
        int runresult = 0;

        if( result != null && result != COMMANDRESULT.NULL_COMMAND && result != COMMANDRESULT.EMPTY_COMMAND )
        {
            try{
                Runtime myRuntime = Runtime.getRuntime();
                Process myProcess = myRuntime.exec( command );
                InputStreamReader myInputStreamReader = new InputStreamReader( myProcess.getInputStream() );
                BufferedReader myBufferedReader = new BufferedReader( myInputStreamReader );

                String line = null;
                while( ( line = myBufferedReader.readLine() ) != null )
            {       System.out.println( line );
            }

                runresult = myProcess.waitFor();

                if( runresult == 0 )
                {           result = COMMANDRESULT.SUCCESS;
                }
                else
                {           result = COMMANDRESULT.ERROR;
                }

            }catch( Exception e )
            {       e.printStackTrace();
            }
        }
    }

    protected String returnLastCommandResult()
    {       return result.toString();
    }

} //end class


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import java.util.Properties;

class OperatingSystem
{
    private enum OSTYPE
    {       LINUX, MAC, WINDOWS
    }
    private OSTYPE os;

    OperatingSystem( )
    {
        Properties currentSystemProperties = System.getProperties();
        String osName = currentSystemProperties.getProperty( "os.name" );
        osName = osName.toLowerCase();
        if( osName.contains( "linux" ) )
        {       os = OSTYPE.LINUX;
        }
        else if( osName.contains( "mac" ) )
        {       os = OSTYPE.MAC;
        }
        else if( osName.contains( "windows" ) )
        {       os = OSTYPE.WINDOWS;
        }
    }

    protected boolean isLinux( )
    {
        boolean result = false;
        if( os == OSTYPE.LINUX )
        {       result = true;
        }
        return result;
    }
    protected boolean isMac( )
    {
        boolean result = false;
        if( os == OSTYPE.MAC )
        {       result = true;
        }
        return result;
    }
    protected boolean isWindows( )
    {
        boolean result = false;
        if( os == OSTYPE.WINDOWS )
        {       result = true;
        }
        return result;
    }
} //end class