code: public DescribeEventDetailsRequest withEventArns(String... eventArns) {
          if (this.eventArns == null) {
              setEventArns(new java.util.ArrayList<String>(eventArns.length));
          }
          for (String ele : eventArns) {
              this.eventArns.add(ele);
          }
          return this;
      }
docs: <p>
  A list of event ARNs (unique identifiers). For example:
  <code>"arn:aws:health:us-east-1::event/EC2/EC2_INSTANCE_RETIREMENT_SCHEDULED/EC2_INSTANCE_RETIREMENT_SCHEDULED_ABC123-CDE456", "arn:aws:health:us-west-1::event/EBS/AWS_EBS_LOST_VOLUME/AWS_EBS_LOST_VOLUME_CHI789_JKL101"</code>
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setEventArns(java.util.Collection)} or {@link #withEventArns(java.util.Collection)} if you want to
  override the existing values.
  </p>
  
  @param eventArns
  A list of event ARNs (unique identifiers). For example:
  <code>"arn:aws:health:us-east-1::event/EC2/EC2_INSTANCE_RETIREMENT_SCHEDULED/EC2_INSTANCE_RETIREMENT_SCHEDULED_ABC123-CDE456", "arn:aws:health:us-west-1::event/EBS/AWS_EBS_LOST_VOLUME/AWS_EBS_LOST_VOLUME_CHI789_JKL101"</code>
  @return Returns a reference to this object so that method calls can be chained together.