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Dequeued: first element Element: second element Element: third element
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Elements are added to the Queue using the Enqueue method and are removed using Dequeue. The Queue class implements the IEnumerable interface and can be used in a foreach loop. In contrast with an ArrayList, it's not possible to get an element by index. However, it's possible to see what value is at the head of the queue by calling Peek. It can be determined that a value is contained in the Queue by calling the Contains method. The number of elements in the queue is available using the Count property.
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Stack
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Unlike a queue, a stack is a last in, first out (LIFO) collection, in which the most recently added element is the one that will be returned first. Java and .NET both provide stack implementations. The .NET stack class is System.Collections.Stack. Here's an example using Stack:
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Stack x_stack = new Stack(); x_stack.Push("first element"); x_stack.Push("second element"); x_stack.Push("third element"); object x_obj = x_stack.Pop(); Console.WriteLine("POPPED: " + x_obj.ToString()); IEnumerator x_num = x_stack.GetEnumerator(); while (x_num.MoveNext()) { Console.WriteLine("ELEMENT: " + x_num.Current.ToString()); }
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9. Collections
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The result of this example follows:
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POPPED: third element ELEMENT: second element ELEMENT: first element
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The Java java.net.Stack class has been around since Java 1.0 and is derived from the Vector class. This presents a potential misuse problem whereby a reference to a Stack can be cast to a Vector, allowing the underlying elements to be manipulated as a list. The .NET implementation isn't derived from any other collection and can't be misused in this manner. Table 9-6 shows the mapping between the Java and .NET stack classes.
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Table 9-6. Comparison Between the Java and C# Stack Implementations
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Java Stack empty() peek() pop() push() search() clear() contains() iterator()
.NET Stack Count == 0 Peek() Pop() Push() N/A Clear() Contains() GetEnumerator()
SortedList
The System.Collections.SortedList class is a cross between a Hashtable and an ArrayList. Two arrays are maintained, one for keys and one for values. The value array is used when a value is requested by index, like an ArrayList. When a value is requested by key, the index is obtained by searching the key array and then the matching value is obtained from the value array, which behaves like a Hashtable but requires more operations. When a new item is added, the key array is re-sorted, and the value array is adjusted to reflect the changes. This is an unusual approach, and it can be seen that special support was added to the System.Array class to assist in the sort operations. (For example, look at the Sort(Array, Array) method as an example of this special support.) The closest analog in Java is the java.util.SortedSet interface and related concrete implementations. In general, requesting values by key is slower with a SortedList than a Hashtable. However, the advantage of being able to request a value by index makes this class valuable for some problems. Here's a simple example for this class:
SortedList x_list = new SortedList(); x_list["allen"] = "jones"; x_list["adam"] = "freeman"; // get the first element Console.WriteLine("First element: " + x_list.GetByIndex(0));
9. Collections // get the index of the key "allen" Console.WriteLine("Index of \"allen\": " + x_list.IndexOfKey("allen")); // get the index of the value "freeman" Console.WriteLine("Index of value \"freeman\": " + x_list.IndexOfValue("freeman"));
The output from this fragment is
First element: freeman Index of "allen": 1 Index of value "freeman": 0
The sorting operations can be handled by using the CompareTo method of classes that implement IComparable or by an instance of IComparator.
Specialized Collections
The System.Collections.Specialized namespace contains a series of collections that either are strongly typed or offer functionality that is not widely required.
Strongly Typed Collections
The strongly typed collections all deal exclusively with strings.
NameObjectCollectionBase and NameValueCollection
The NameObjectCollectionBase class is an abstract class that is based on a Hashtable but that accepts only strings as key types. The only concrete implementation of this class in the collections namespace is NameValueCollection. The NameValueCollection class is derived from NameObjectCollectionBase but can be used to store multiple values for each key. However, both the key and the values must be strings. The most obvious use of this class is processing HTTP headers. Here's an example:
NameValueCollection x_collection = new NameValueCollection(); x_collection.Add("key", "value1"); x_collection.Add("key", "value2"); string[] x_arr = x_collection.GetValues("key"); foreach (string x_str in x_arr) { Console.WriteLine("VALUE: " + x_str); }
The result of this fragment follows:
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