code: public VirtualNodeSpec withBackends(Backend... backends) {
          if (this.backends == null) {
              setBackends(new java.util.ArrayList<Backend>(backends.length));
          }
          for (Backend ele : backends) {
              this.backends.add(ele);
          }
          return this;
      }
docs: <p>
  The backends that the virtual node is expected to send outbound traffic to.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setBackends(java.util.Collection)} or {@link #withBackends(java.util.Collection)} if you want to override
  the existing values.
  </p>
  
  @param backends
  The backends that the virtual node is expected to send outbound traffic to.
  @return Returns a reference to this object so that method calls can be chained together.