public UpdateProtectConfigurationCountryRuleSetResult addCountryRuleSetEntry(String key, ProtectConfigurationCountryRuleSetInformation value) {
        if (null == this.countryRuleSet) {
            this.countryRuleSet = new java.util.HashMap<String, ProtectConfigurationCountryRuleSetInformation>();
        }
        if (this.countryRuleSet.containsKey(key))
            throw new IllegalArgumentException("Duplicated keys (" + key.toString() + ") are provided.");
        this.countryRuleSet.put(key, value);
        return this;
    }
Add a single CountryRuleSet entry

@see UpdateProtectConfigurationCountryRuleSetResult#withCountryRuleSet
@returns a reference to this object so that method calls can be chained together.
aws-java-sdk-pinpointsmsvoicev2/src/main/java/com/amazonaws/services/pinpointsmsvoicev2/model/UpdateProtectConfigurationCountryRuleSetResult.java