public java.util.List<String> getInstanceIds() {
        if (instanceIds == null) {
            instanceIds = new com.amazonaws.internal.SdkInternalList<String>();
        }
        return instanceIds;
    }
<p>
An array of instance IDs to be described. If you use this parameter, <code>DescribeInstances</code> returns a
description of the specified instances. Otherwise, it returns a description of every instance.
</p>

@return An array of instance IDs to be described. If you use this parameter, <code>DescribeInstances</code>
        returns a description of the specified instances. Otherwise, it returns a description of every instance.
aws-java-sdk-opsworks/src/main/java/com/amazonaws/services/opsworks/model/DescribeInstancesRequest.java