public String getDBInstanceIdentifier() {
        return this.dBInstanceIdentifier;
    }
<p>
The DB instance identifier. This value is stored as a lowercase string.
</p>
<p>
Constraints:
</p>
<ul>
<li>
<p>
Must match the identifier of an existing DBInstance.
</p>
</li>
</ul>

@return The DB instance identifier. This value is stored as a lowercase string.</p>
        <p>
        Constraints:
        </p>
        <ul>
        <li>
        <p>
        Must match the identifier of an existing DBInstance.
        </p>
        </li>
aws-java-sdk-neptune/src/main/java/com/amazonaws/services/neptune/model/ModifyDBInstanceRequest.java