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cannot change the cache for the manager after creation, but you can change the defaultinstalled handler at any time. Besides the additional cookie support in standard Java, there is a new IDN class for converting internationalized domain names (IDNs) between an ASCII-compatible encoding (ACE) and Unicode representation. In addition, there is a new InterfaceAddress class and new methods added to NetworkInterface for providing information about the available network interfaces. Listing 3-7 demonstrates the new methods added. The method names make the purpose of the methods pretty obvious, so no explanation is necessary.

Figure 7-18. A protected member of a public class is visible to members of its own class or classes derived from it. The derived classes can even be in other assemblies.

Members marked internal are visible to all the classes in the assembly, but not to classes outside the assembly, as shown in Figure 7-19.

import java.io.*; import java.net.*; import java.util.*;

The idea of encapsulation is extended to include the direct usability of a class s data and processes by other classes (Code accessibility by developers is a different issue) The practical power of encapsulation is that it functionally separates interfaces from implementations With limited scoping, each function produces a product, fulfilling a set of objectives in its production The product can be what the function returns to the caller; or it can be an effect on the system, with the function returning a notation about that effect or not returning anything When functions are designed well (without side effects), developers mostly don t need to think about how the functions fulfill their objectives; they need to think only about how to use those functions From the providers side, one basic implementation can have multiple interfaces; this is actually a parallel to class specializing, or even mental directing.

Figure 7-19. An internal member of a public class is visible to members of any class in the same assembly, but not to classes outside the assembly.

Members marked protected internal are visible to all the classes that inherit from the class, and also to all classes inside the assembly, as shown in Figure 7-20. Notice that the set of classes allowed access is the combined set of classes allowed by the protected modifier plus the set of classes allowed by the internal modifier. Notice that this is the union of protected and internal not the intersection.

public class NetworkInfo { public static void main(String args[]) throws SocketException { Console console = System.console(); Enumeration<NetworkInterface> nets = NetworkInterface.getNetworkInterfaces(); for (NetworkInterface netint : Collections.list(nets)) { console.printf("Display name: %s%n", netint.getDisplayName()); console.printf("Name: %s%n", netint.getName()); console.printf("Hardware address: %s%n", Arrays.toString(netint.getHardwareAddress())); console.printf("Parent: %s%n", netint.getParent()); console.printf("MTU: %s%n", netint.getMTU()); console.printf("Loopback %s%n", netint.isLoopback()); console.printf("PointToPoint %s%n", netint.isPointToPoint()); console.printf("Up %s%n", netint.isUp()); console.printf("Virtual %s%n", netint.isVirtual()); console.printf("Supports multicast %s%n", netint.isVirtual()); List<InterfaceAddress> addrs = netint.getInterfaceAddresses(); for (InterfaceAddress addr : addrs) { console.printf("InterfaceAddress: %s --- %s%n", addr.getAddress(), addr.getBroadcast()); } console.printf("%n"); } } }

Figure 7-20. A protected internal member of a public class is visible to members of classes in the same assembly or to members of classes derived from that class. It is not visible to classes in other assemblies that are not derived from the class.

For more perspective, some function-oriented languages define their simple (primitive) data types, including how they are processed, with classes instead of directly in the compiler (Handling them in the compiler is faster) This is an extreme clue to the fact that other classes simply define complex (compound) data types and how they are processed These compound data types can be composed of any other data types (simple and complex) Further, just as simply typed data can be passed to a method, so can complexly typed data; they are all (logical) objects With an object passed, the applicable calls from the receiving object can go to methods of the passed object; this is the practical usage of polymorphism So, any of these calls is actually a blind (variable) reference to any applicable method.

Again, the results of running the program depend upon your system configuration. They re similar to what you might see with an ipconfig command. The physical address is shown as a series of signed bytes. More commonly, you would expect to see their hex values.

The following two tables summarize the characteristics of the five member access levels. Table 7-1 lists the modifiers and gives an intuitive summary of the effects of the modifier. Table 7-1. Member Access Modifiers