public void setDefaultInstanceName(String defaultInstanceName) {
        this.defaultInstanceName = defaultInstanceName;
    }
<p>
A name for the managed node when it is created.
</p>

@param defaultInstanceName
       A name for the managed node when it is created.
aws-java-sdk-ssm/src/main/java/com/amazonaws/services/simplesystemsmanagement/model/Activation.java