public String getMasterUsername() {
        return this.masterUsername;
    }
<p>
The name for the master user.
</p>
<p>
Constraints:
</p>
<ul>
<li>
<p>
Must be 1 to 16 letters or numbers.
</p>
</li>
<li>
<p>
First character must be a letter.
</p>
</li>
<li>
<p>
Can't be a reserved word for the chosen database engine.
</p>
</li>
</ul>

@return The name for the master user.</p>
        <p>
        Constraints:
        </p>
        <ul>
        <li>
        <p>
        Must be 1 to 16 letters or numbers.
        </p>
        </li>
        <li>
        <p>
        First character must be a letter.
        </p>
        </li>
        <li>
        <p>
        Can't be a reserved word for the chosen database engine.
        </p>
        </li>
aws-java-sdk-rds/src/main/java/com/amazonaws/services/rds/model/RestoreDBInstanceFromS3Request.java