standby esxi

I have to standby ESXi and i use this program

package package1;

import java.net.URL;

import com.vmware.vim25.mo.Task;

import com.vmware.vim25.mo.HostSystem;

import com.vmware.vim25.mo.ManagedEntity;

import com.vmware.vim25.mo.ServiceInstance;

import com.vmware.vim25.mo.InventoryNavigator;

public class Standby {

public static void main(String[] args) throws Exception {

  {

      HostSystem hs;

   ServiceInstance si = new ServiceInstance(new URL(args[0]), args[1], args[2], true);

       ManagedEntity[] hostmanagedEntities = new InventoryNavigator(

       si.getRootFolder()).searchManagedEntities("HostSystem");

       hs = (HostSystem) hostmanagedEntities[2];

      Task standby = hs.powerDownHostToStandBy(30, true);

        standby.waitForTask();

}}}

But instead of using number of array Like [1] for some Esxi server and [2] for another server , can i put IP of this ESXi server directly and standby this server