CODEWITHSUNDEEP
java
Uday Kiran
Uday Kiran

Reputation: 612

How to extract Map values from set

My Map has below key = value pair, now how to get the GCO value from the set {} ?

MAP : {containerIdentifier={ID=null, dto=null, GCO=123, version=1}, containerEditable=true}

code :

        for (Entry<String, Object> entry : map.entrySet())
System.out.println("Key = " + entry.getKey() +", Value = " + entry.getValue());

Output : 

Key = containerIdentifier, Value = {ID =null, dto=null, GCO=123, version=1}
Key = containerEditable, Value = true

how to get the only GCO 123 from value ?

Upvotes: 2

Views: 1054

Answers (2)

Maxim Kasyanov
Maxim Kasyanov

Reputation: 1058

You could use java steam api.

map.values().stream()
            .flatMap(innerMaps -> innerMaps.entrySet().stream())
            .filter(entry-> "GCO".equals(entry.getKey()))
            .map(Map.Entry::getValue)
            .findAny().orElse("not found")

Upvotes: 2

Eran
Eran

Reputation: 393856

You have to check when the value of the original Map is also a Map. Then you can cast it to a Map and lookup the value of a specific key in that inner Map:

for (Entry<String, Object> entry : map.entrySet()) {
    if (entry.getValue() instanceof Map) {
        Map innermap = (Map) entry.getValue();
        System.out.println(innermap.get("GCO"));
    }
}

This is assuming the value of the original Map is not always a Map (and considering the second entry in your sample Map, whose value is a Boolean, that assumption is correct).

Upvotes: 2

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