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This code produces the following output: Person Info: bill, 25 Person Info: Nemo, 35 If you had defined the same conversion operators as explicit rather than implicit, then you would have needed to use cast expressions to perform the conversions, as shown here: Explicit ... public static explicit operator int( Person p ) { return p.Age; } ... static void Main( ) { ... Requires cast expression int age = (int) bill; ...

Function Program Function call Operational integrity Data item or function Functional scope Implicitly copied program Rewritten Copied program Implicitly copying Program template Program Usage of one program in another File Data values Set of programs Function s call format Set of call formats Call handling process Individualized call handling processes Function name with multiple call formats

The user-defined conversions discussed so far have directly converted the source type to an object of the target type in a single step, as shown in Figure 18-26.

Compile the program and you re done. No extra classes necessary. Listing 3-6 shows the modified version. As an additional step, the modified program shows the cookies cached to the store at the end of the run.

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Figure 18-26. Single-step user-defined conversion But user-defined conversions can have up to three steps in the full conversion. Figure 18-27 illustrates these stages, which include The preliminary standard conversion The user-defined conversion The following standard conversion There is never more than a single user-defined conversion in the chain.

Method Class Message Encapsulation Member Granularity Derived class Overridden Base class Inheritance Abstract class Concrete class Object Persistent object State Library, package Signature Interface Implementation Polymorphism Overloading

The following code declares class Employee, which is derived from class Person. Several sections ago, the code sample declared a user-defined conversion from class Person to int. So if there is a standard conversion from Employee to Person and one from int to float, you can convert from Employee to float. There is a standard conversion from Employee to Person, since Employee is derived from Person. There is a standard conversion from int to float, since that is an implicit numeric conversion. Since all three parts of the chain exist, you can convert from Employee to float. Figure 18-28 illustrates how the compiler performs the conversion.

import java.io.*; import java.net.*; import java.util.*; public class Fetch { public static void main(String args[]) throws Exception { Console console = System.console(); if (args.length == 0) { System.err.println("URL missing"); System.exit(-1); } String urlString = args[0]; CookieManager manager = new CookieManager(); CookieHandler.setDefault(manager); URL url = new URL(urlString); URLConnection connection = url.openConnection(); Object obj = connection.getContent(); url = new URL(urlString); connection = url.openConnection(); obj = connection.getContent(); CookieStore cookieJar = manager.getCookieStore(); List<HttpCookie> cookies = cookieJar.getCookies(); for (HttpCookie cookie: cookies) { console.printf("Cookie: %s%n", cookie); } } }

class Employee : Person { } class Person { public string Name; public int Age; // Convert a Person object to an int. public static implicit operator int(Person p) { return p.Age; } } class Program { static void Main( ) { Employee bill = new Employee(); bill.Name = "William"; bill.Age = 25; Convert an Employee to a float. float fVar = bill; Console.WriteLine("Person Info: {0}, {1}", bill.Name, fVar); } }

Based on Structure-oriented (Nonblock) Languages: These definitions are not as straightforward. For most of them, function is substituted with program , and, separately, program is substituted with library . A structured program is a function-oriented method (of handling data). A set of programs a limited-purpose library is a class. A call from one program to another is a message. The fact that a library needs operational integrity in both data and processes is encapsulation. Each occurrence of data or programs is a member (of the class). The functional scope of a library is its granularity.

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