ProvidesKey (GWT Javadoc)

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## com.google.gwt.view.client
Interface ProvidesKey<T>

Type Parameters:
  `T` - the data type of records in the list

All Known Subinterfaces:
  SelectionModel<T>, SetSelectionModel<T>

All Known Implementing Classes:
  AbstractDataProvider, AsyncDataProvider, DefaultSelectionModel, EntityProxyKeyProvider, ListDataProvider, MultiSelectionModel, NoSelectionModel, OrderedMultiSelectionModel, SelectionModel.AbstractSelectionModel, SimpleKeyProvider, SingleSelectionModel

    public interface ProvidesKey<T>

Implementors of `ProvidesKey` provide a key for list items, such that items that are to be treated as distinct (for example, for editing) have distinct keys.

The key must implement a coherent set of `Object.equals(Object)` and `Object.hashCode()` methods such that if objects `A` and `B` are to be treated as identical, then `A.equals(B)`, `B.equals(A)`, and `A.hashCode() == B.hashCode()`. If `A` and `B` are to be treated as unequal, then it must be the case that `A.equals(B) == false` and `B.equals(A) == false`.

Method Summary
`java.lang.Object` | `getKey(T item)` Get the key for a list item.

Method Detail

### getKey

    java.lang.Object getKey(T item)

  Get the key for a list item.

  Parameters:
    `item` - the list item
  Returns:
    the key that represents the item

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