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Can anyone point me to an example of how to use a Map in Groovy which has a String as its key and a List as value?
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We can use the map literal syntax [k:v] for creating maps. Basically, it allows us to instantiate a map and define entries in one line. Notice that the keys aren't surrounded by quotes, and by default, Groovy creates an instance of java.
If you wanted to do it that way, iterate over map. keySet() and the rest will work as you expected. It should work if you use s. key & s.
Maps are associative containers that store elements in a specific order. It stores elements in a combination of key values and mapped values. To insert the data in the map insert() function in the map is used.
Groovy accepts nearly all Java syntax, so there is a spectrum of choices, as illustrated below:
// Java syntax Map<String,List> map1 = new HashMap<>(); List list1 = new ArrayList(); list1.add("hello"); map1.put("abc", list1); assert map1.get("abc") == list1; // slightly less Java-esque def map2 = new HashMap<String,List>() def list2 = new ArrayList() list2.add("hello") map2.put("abc", list2) assert map2.get("abc") == list2 // typical Groovy def map3 = [:] def list3 = [] list3 << "hello" map3.'abc'= list3 assert map3.'abc' == list3 If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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