Web Reference: An object that maps keys to values. A map cannot contain duplicate keys; each key can map to at most one value. This interface takes the place of the Dictionary class, which was a totally abstract class rather than an interface. The Map interface provides three collection views, which allow a map's contents to be viewed as a set of keys, collection of values, or set of key-value mappings. The ... First, it checks if the key is present in the map. If thekeyis present, and a non-null value is related to the key, then it returns that value: As we can see, the key “John” has a non-null mapping present, and it returns the value 5. If our mapping function was used, we’d expect the function to return the length of 4. This tutorial explains Java 8 Map interface's new forEach (), replaceAll (), computeIfAbsent (), computeIfPresent () and getOrDefault () methods with examples to show their usage.
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