code: public void setInstanceNames(java.util.Collection<String> instanceNames) {
          if (instanceNames == null) {
              this.instanceNames = null;
              return;
          }
  
          this.instanceNames = new java.util.ArrayList<String>(instanceNames);
      }
docs: <p>
  An array of strings representing the instance name(s) you want to attach to your load balancer.
  </p>
  <p>
  An instance must be <code>running</code> before you can attach it to your load balancer.
  </p>
  <p>
  There are no additional limits on the number of instances you can attach to your load balancer, aside from the
  limit of Lightsail instances you can create in your account (20).
  </p>
  
  @param instanceNames
  An array of strings representing the instance name(s) you want to attach to your load balancer.</p>
  <p>
  An instance must be <code>running</code> before you can attach it to your load balancer.
  </p>
  <p>
  There are no additional limits on the number of instances you can attach to your load balancer, aside from
  the limit of Lightsail instances you can create in your account (20).