@Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append("{");
        if (getCallInstructionsMessage() != null)
            sb.append("CallInstructionsMessage: ").append(getCallInstructionsMessage()).append(",");
        if (getPlainTextMessage() != null)
            sb.append("PlainTextMessage: ").append(getPlainTextMessage()).append(",");
        if (getSSMLMessage() != null)
            sb.append("SSMLMessage: ").append(getSSMLMessage());
        sb.append("}");
        return sb.toString();
    }
Returns a string representation of this object. This is useful for testing and debugging. Sensitive data will be
redacted from this string using a placeholder value.

@return A string representation of this object.

@see java.lang.Object#toString()
aws-java-sdk-pinpointsmsvoice/src/main/java/com/amazonaws/services/pinpointsmsvoice/model/VoiceMessageContent.java