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Why use a deque Deques are useful data structures for recursive problems, like searching through a maze or parsing source. As you move along a path, you save good spots, adding more data along the way while you think the path is good. If the path turns bad, you pop off the bad bits, returning to the last good spot. Here, you would be adding and removing from the same end, like a stack. Once you find your way through, you start back at the beginning to reveal the solution, which starts at the other end. In lieu of creating a program that finds its way through a maze of twisty passages, all alike, Listing 2-6 demonstrates the use of Deque or more specifically, LinkedBlockingDeque with its capacity limits. It is certainly not the best use of a deque, but it demonstrates the API and what happens when you hit the capacity limit. If all you are doing is adding to one end and removing from the other, you should consider using a Queue implementation in the collections framework instead. The program here takes the 23 names for months (both short and long) and adds them to a six-element blocking deque, one at a time, to the head. In another thread, elements are removed from the head and tail of the deque, based on the number of elements currently in the collection.

Figure 3-9 shows how data is stored when it is not a member of another type. When it is a member of another type, data might be stored a little differently. The data portion of a reference type object is always stored in the heap, as shown in the figure. A value type object, or the reference part of a reference type, can be stored in either the stack or the heap, depending on the circumstances. Suppose, for example, that you have an instance of a reference type, called MyType, that has two members a value type member and a reference type member. How is it stored Is the value type member stored on the stack and the reference type split between the stack and the heap as shown in Figure 3-9 The answer is no.

There are some important constraints on user-defined conversions. The most important are the following: You can only define user-defined conversions for classes and structs. You cannot redefine standard implicit or explicit conversions. The following is true for source type S and target type T: S and T must be different types. S and T cannot be related by inheritance. That is, S cannot be derived from T, and T cannot be derived from S. Neither S nor T can be an interface type or the type object. The conversion operator must be a member of either S or T. You cannot declare two conversions, one implicit and the other explicit, with the same source and target types.

import java.io.*; import java.util.*; import java.util.concurrent.*; public class Blocked { public static void main(String args[]) { Calendar now = Calendar.getInstance(); Locale locale = Locale.getDefault(); final Console console = System.console(); final Map<String, Integer> names = now.getDisplayNames( Calendar.MONTH, Calendar.ALL_STYLES, locale); console.printf("Starting names: %s%n", names); final Deque<String> deque = new LinkedBlockingDeque<String>(6); try { // Fails as too many elements

These types are commonly known as design patterns, and learning them makes designing simpler and smoother Ultimately, they are standardized techniques for manipulating interaction variables But it should be clearly understood that these are design patterns, not designing patterns, which are part of what are commonly known as methodologies A pattern of designing needs and ways to serve them defines a designing pattern (which includes an analyzing phase) There are many designing patterns, from many sources, public and private and the public designing patterns must be tailored to best serve each (private) environment Software creation requires iterations of analyzing, then designing, and then programming (which is really the lowest level designing) The best software design creation requires thorough understanding of all of the levels and how to best manage them To clarify how the various types of mechanisms fit together, it s very helpful to understand that interaction.

The following code defines a class called Person that contains a person s name and age. The class also defines two implicit conversions. The first converts a Person object to an int value. The target int value is the age of the person. The second converts an int to a Person object. class Person { public string Name; public int Age; public Person(string name, int age) { Name = name; Age = age; } public static implicit operator int(Person p) { return p.Age; } public static implicit operator Person(int i) { return new Person("Nemo", i); } } class Program { static void Main( ) { Person bill = new Person( "bill", 25); Convert a Person object to an int. int age = bill; Console.WriteLine("Person Info: {0}, {1}", bill.Name, age); Convert an int to a Person object. Person anon = 35; Console.WriteLine("Person Info: {0}, {1}", anon.Name, anon.Age); } }

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