public java.util.List<String> getSupportedEngineModes() {
        if (supportedEngineModes == null) {
            supportedEngineModes = new com.amazonaws.internal.SdkInternalList<String>();
        }
        return supportedEngineModes;
    }
<p>
A list of the supported DB engine modes for the target engine version.
</p>

@return A list of the supported DB engine modes for the target engine version.
aws-java-sdk-rds/src/main/java/com/amazonaws/services/rds/model/UpgradeTarget.java