code: public DescribeInstanceHealthResult withInstanceStates(InstanceState... instanceStates) {
          if (this.instanceStates == null) {
              setInstanceStates(new com.amazonaws.internal.SdkInternalList<InstanceState>(instanceStates.length));
          }
          for (InstanceState ele : instanceStates) {
              this.instanceStates.add(ele);
          }
          return this;
      }
docs: <p>
  Information about the health of the instances.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setInstanceStates(java.util.Collection)} or {@link #withInstanceStates(java.util.Collection)} if you want
  to override the existing values.
  </p>
  
  @param instanceStates
  Information about the health of the instances.
  @return Returns a reference to this object so that method calls can be chained together.