qr code generator c# asp.net The Methods De ned by Stack<T> in C#.NET

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The Methods De ned by Stack<T>
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25:
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Collections, Enumerators, and Iterators
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The following program demonstrates Stack<T>:
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// Demonstrate the Stack<T> class using System; using SystemCollectionsGeneric; class GenStackDemo { static void Main() { Stack<string> st = new Stack<string>(); stPush("One"); stPush("Two"); stPush("Three"); stPush("Four"); stPush("Five"); while(stCount > 0) { string str = stPop(); ConsoleWrite(str + " "); } ConsoleWriteLine(); } }
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PART II
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The output is shown here:
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The Queue<T> Class
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Queue<T> is the generic equivalent of the non-generic Queue class It supports a first-in, first-out list Queue<T> implements the ICollection, IEnumerable, and IEnumerable<T> interfaces Queue<T> directly implements the Clear( ), Contains( ), and CopyTo( ) methods defined by ICollection<T> (The Add( ) and Remove( ) methods are not supported, nor is the IsReadOnly property) Queue<T> is a dynamic collection that grows as needed to accommodate the elements it must store It defines the following constructors: public Queue( ) public Queue(int capacity) public Queue(IEnumerable<T> collection) The first form creates an empty queue with an initial default capacity The second form creates an empty queue with the initial capacity specified by capacity The third form creates a queue that contains the elements of the collection specified by collection In addition to the methods defined by the interfaces that it implements (and those methods defined by ICollection<T> that it implements on its own), Queue<T> defines the methods shown in Table 25-21 Queue<T> works just like its non-generic counterpart To put an object in the queue, call Enqueue( ) To remove and return the object at the front of the queue, call Dequeue( ) You can use Peek( ) to return, but not remove, the next object An InvalidOperationException is thrown if you call Dequeue( ) or Peek( ) when the invoking queue is empty
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Part II:
Exploring the C# Library
Method public T Dequeue( ) public void Enqueue(T item) public T Peek( ) public T[ ] ToArray( ) public void TrimExcess( )
TABLE 25-21
Description Returns the object at the front of the invoking queue The object is removed in the process Adds item to the end of the queue Returns the object at the front of the invoking queue, but does not remove it Returns an array that contains copies of the elements of the invoking queue Removes the excess capacity of the invoking stack
The Methods De ned by Queue<T>
Here is an example that demonstrates Queue<T>:
// Demonstrate the Queue<T> class using System; using SystemCollectionsGeneric; class GenQueueDemo { static void Main() { Queue<double> q = new Queue<double>(); qEnqueue(986); qEnqueue(2120); qEnqueue(320); qEnqueue(31416); double sum = 00; ConsoleWrite("Queue contents: "); while(qCount > 0) { double val = qDequeue(); ConsoleWrite(val + " "); sum += val; } ConsoleWriteLine("\nTotal is " + sum); } }
The output is shown here:
Queue contents: 986 212 32 31416 Total is 3457416
HashSet<T>
HashSet<T> supports a collection that implements a set It uses a hash table for storage HashSet<T> implements the ICollection<T>, ISet<T>, IEnumerable, IEnumerable<T>, ISerializable, and IDeserializationCallback interfaces HashSet<T> implements a set in which all elements are unique In other words, duplicates are not allowed The order of the elements is not specified HashSet<T> implements the full complement of set operations defined by ISet<T>, such as intersection, union, and symmetric difference This makes
25:
Collections, Enumerators, and Iterators
HashSet<T> the perfect choice for working with sets of objects when order does not matter HashSet<T> is a dynamic collection that grows as needed to accommodate the elements it must store Here are four commonly used constructors defined by HashSet<T>: public HashSet( ) public HashSet(IEnumerable<T> collection) public HashSet(IEqualityComparer comparer) public HashSet(IEnumerable<T> collection, IEqualityComparer comparer) The first form creates an empty set The second creates a set that contains the elements of the collection specified by collection The third lets you specify the comparer The fourth creates a set that contains the elements in the collection specified by collection and uses the comparer specified by comparer There is also a fifth constructor that lets you initialize a set from serialized data Because HashSet<T> implements ISet<T>, it provides a complete assortment of set operations Another set-related method that it provides is RemoveWhere( ), which removes elements that satisfy a specified predicate In addition to the properties defined by the interfaces that it implements, HashSet<T> adds Comparer, shown here: public IEqualityComparer<T> Comparer { get; } It obtains the comparer for the invoking hash set Here is an example that shows HashSet<T> in action:
// Demonstrate the HashSet<T> class using System; using SystemCollectionsGeneric; class HashSetDemo { static void Show(string msg, HashSet<char> set) { ConsoleWrite(msg); foreach(char ch in set) ConsoleWrite(ch + " "); ConsoleWriteLine(); } static void Main() { HashSet<char> setA = new HashSet<char>(); HashSet<char> setB = new HashSet<char>(); setAAdd('A'); setAAdd('B'); setAAdd('C'); setBAdd('C'); setBAdd('D'); setBAdd('E'); Show("Initial content of setA: ", setA);
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