DATATYPES in Objective-C

Generator ECC200 in Objective-C DATATYPES

Properties icon to switch back to Properties. The Properties icon is shown in Figure 9-20:
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foreach (string s in readonlyList) { Console.WriteLine("Readonly List Item: {0}", s); } // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } } In the example, I create a regular List<T> and populate it with three string items. I then call the AsReadOnly method to create a read-only version of the collection. I assign the result of calling the AsReadOnly method to an IList<string>, but the underlying class that is returned is System.Collections.ObjectModel.ReadOnlyCollection, which also implements IList<T>, ICollection<T>, and IEnumerable<T> interfaces. You can determine whether a collection is read-only by using the IsReadOnly property of the ICollection<T> interface. In the example, I have written out the result of this property for both of the lists. Using a read-only IList<T> is just like using a regular list, unless you try to modify the contents, in which case an instance of System.NotSupportedException is thrown. You can see this in the listing when I try to add guava to the collection. Compiling and running the code in Listing 19-34 produces the following results: normalList is read-only: False readonlyList is read-only: True Trying to remove an item from the read-only list Exception: System.NotSupportedException Enumerating readonly list Readonly List Item: apple Readonly List Item: banana Press enter to finish Toward the end of the listing, I remove an item from the regular list and then enumerate the readonly list. You can see from the results that the item I removed is gone from both lists. As you can see, some care if required to ensure that you don t pass around references to the regular list since it can be used to modify both collections and so undermine the purpose of using a read-only collection in the first place. If you want to disassociate the read-only list from the regular list, then you can create an intermediate collection that will be used by the read-only list as follows:
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DBMS_STATS package supersedes it. This is not true. What is true is that ANALYZE should not be used to gather statistics, but the other capabilities of ANALYZE still apply. The ANALYZE command should be used to perform operations such as validating the structure of an index (as we will below) or listing chained rows in a table. DBMS_STATS should be used exclusively to gather statistics on objects.
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Figure 6-9. The updated task is now in Completed status.
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