The uniqueIndex method in the com.google.common.collect.Maps class creates an index for a collection of objects based on a unique key. This method returns a Map object that uses the unique key to index the original collection.
For example, let's assume we have a collection that contains a list of users with unique IDs:
List users = Arrays.asList( new User(1, "Alice"), new User(2, "Bob"), new User(3, "Charlie") );
We can create an index of these users using their IDs using the uniqueIndex method:
The Maps class is part of the com.google.common.collect package, which is a collection of classes for working with collections in Java.
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