Java Lambda

Map<String, String> insured = Stream.of("Adults:1", "Children:1", "Senior Citizen:10")
                                    .map(pair -> pair.split(":"))
                                    .collect(Collectors.toMap(pair -> pair[0], pair->pair[1]));

Double totalInsured = insured.values().stream().mapToDouble(d -> Double.parseDouble(d)).sum();
Double totalInsured = insured.values().stream().mapToDouble(Double::parseDouble).sum();

Integer totalInsured = insured.values().stream().mapToInt(d -> Integer.parseInt(d)).sum();
Integer totalInsured = insured.values().stream().mapToInt(Integer::parseInt).sum();

Map<String, String> filter  = insured.entrySet().stream()
                                     .filter(map -> !"Children".equals(map.getKey()))
                                     .collect(Collectors.toMap(map -> map.getKey(), map -> map.getValue()));

Integer totalInsured = filter.values().stream().mapToInt(Integer::parseInt).sum();

---

Map<String, String> mapping =  Stream.of("travel_adult:Adults", "travel_children:Children", "travel_senior_citizen:Senior Citizen")
                                     .map(pair -> pair.split(":"))
                                     .collect(Collectors.toMap(pair -> pair[0], pair->pair[1]));

Map<String, String> reverse = mapping.entrySet().stream()
                                     .collect(Collectors.toMap(map -> map.getValue(), map -> map.getKey()));

---

int totalInsured = properties.entrySet().stream()
        .filter(map-> ArrayUtils.contains(INSURED_OBJECT_MAP.values().toArray(), map.getKey()))
        .collect(Collectors.toMap(map -> map.getKey(), map -> (Integer)map.getValue()))
        .values().stream().mapToInt(Integer::new).sum();

---

private static Map<String, Object> decode(String encode) {
    return Stream.of(encode.split(LIST_SPLITTER))
            .map(String::trim).collect(Collectors.toList())
            .stream().map(pair -> pair.split(PAIR_SPLITTER))
            .collect(Collectors.toMap(array -> array[0], array -> array[1]));
}

References

Sum values in a Map with a stream Else method for ifPresent Stream Java stream filter sum of values