interface CanIndexNullable<K, V>

Interface CanIndexNullable<K,V> specifies that a class can return a value associated with a particular key. This interface allows overloading of the [] operator used to load values. If this operator is applied, the appropriate index(K) method will be called, returning a matching value or returning null if the key cannot be found. This interface provides load indexing functionality for nullable arrays, maps, and other symbol tables. It differs from the CanIndex<K,V> interface in that its index(K) method can return null. Interface CanIndexStoreNullable<K,V> provides related index store functionality.

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