@Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append("{");
        if (getUrl() != null)
            sb.append("Url: ").append(getUrl()).append(",");
        if (getAttachment() != null)
            sb.append("Attachment: ").append(getAttachment()).append(",");
        if (getString() != null)
            sb.append("String: ").append(getString()).append(",");
        if (getNumber() != null)
            sb.append("Number: ").append(getNumber()).append(",");
        if (getDate() != null)
            sb.append("Date: ").append(getDate()).append(",");
        if (getEmail() != null)
            sb.append("Email: ").append(getEmail());
        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-connect/src/main/java/com/amazonaws/services/connect/model/ReferenceSummary.java