public void setUsername(String username) {
        this.username = username;
    }
<p>
The username associated with the temporary credentials that you use to connect to cluster endpoints.
</p>

@param username
       The username associated with the temporary credentials that you use to connect to cluster endpoints.
aws-java-sdk-emr/src/main/java/com/amazonaws/services/elasticmapreduce/model/UsernamePassword.java