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The range of networking classes provided by Java makes it an ideal language for network programming Having been designed from the ground up to support networking, developers will find Java a far easier language to work with than, for example, C or C++ There are no annoying data structures and pointers to worry about, nor is there a need to change networking libraries when moving from a Wintel platform to Unix That said, there are some unique considerations and restrictions relative to Java of which developers must be mindful First, readers should be aware that Java does not provide low-level access to Internet protocols Some languages make it possible o write raw IP datagrams and to send ICMP messages Java does not provide this functionality While this will not affect many developers, it does mean that Java can't be used to write, for example, a ping application that sends ICMP echo request messages It also means that developers can't create custom transport protocols that run on IP datagrams (for example, creating a substitute for TCP) Second, Java imposes severe security restrictions on Java applets While stand-alone applications and servlets have free reign when it comes to network access, applets will find their actions limited This is, of course, justified Consider the risk to users if applets which are downloaded automatically and may not be visible to the user if the size of the applet is set very small, say a few pixels in size could connect to any machine on the Internet to send data, or could connect to machines within a local area network (LAN) They would undoubtedly be used to compromise the security of machines The ability to bypass a firewall and run from within a LAN would make them a severe security risk The designers of Java, and browser manufacturers, sought to balance the need for functionality against the need for security Rather than running the risk of network administrators barring the use of Java (either through firewall filters, or the configuration of browsers to disable access to Java applets), a decision was made to limit applets' network access The restrictions are fairly simple 1 No applet may bind to a local port, to prevent an applet masquerading as a legitimate service (such as a Web server) 2 An applet may connect only to the machine from which its codebase[1] was loaded (usually, but not always, the same Web server of the page that hosts the applet), to prevent applets from accessing internal servers or covertly sending data to another site.

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is that programs are designed to be run, whereas modules are designed to be imported and used by programs Not all modules have associated py les for example, the sys module is built into Python, and some modules are written in other languages (most commonly, C) However, much of Python s library is written in Python, so, for example, if we write import collections we can create named tuples by calling collectionsnamedtuple(), and the functionality we are ccessing is in the collectionspy module le It makes no difference to our programs what language a module is written in, since all modules are imported and used in the same way Several syntaxes can be used when importing For example:. Make Bar Code In .NET Framework Using Barcode maker for .Related: 

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dif cult to instantiate its constructor is package-scoped and we d have to ll in a chain of dependencies to create one As it happens, we don t need one anyway for the current functionality, so we ust pass in a null value to satisfy the compiler but use a named constant to make clear its signi cance To be clear, this null is not a null object [Woolf98] which may be called and will do nothing in response This null is just a placeholder and will fail if called during the test. Bar Code Generator In Visual C# Using Barcode encoder for .Related: 

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The second purpose is to provide cryptography functionality to Java evelopers charged with creating secure applications Parts of a crypto API were released with JDK 11 The parts included both one-way hash functions and Using Barcode drawer for Visual Studio NET Control o generate, create QR Code image in NET framework applications Digital signatures, which are discussed next, make it possible o authenticate who has vouched for a piece of code, and potentially check it for tampering If you decide to trust a particular person, you can set things up so that you automatically trust programs that person signs (Note that with the right tools, anyone can sign any piece of code Whether or not a piece of code is written, released, or supported by the person who signed it is not something digital signatures can tell you.

) Because the signature is a mechanism for vouching and spreading trust around, if you trust some experts in the field who agree to approve Java programs based on their analysis, you can trust any code that they sign as well Digital signing paves the way for a true community of trust to develop We think digital signing is important enough to warrant an entire section itself See page 88 Beyond digital signatures, the crypto API released with JDK 11 includes a couple of other capabilities One-way hash functions provide a way to fingerprint a program or data so that you can verify that it has not been changed since being created Fingerprinting hash functions such as MD5 and SHA make distribution over the Net easier to swallow.

If you are certain that a program you are downloading from the Net is the original program (and not a Trojan Horse masquerading as the original), you will probably be more likely to use it Many archives on the Web today make use of MD5 Fingerprinting, also called message digesting, works by performing a one-way hash over a series of bytes Given a program (which is really just a bunch of ones and zeros), it is possible to compute a hash that ends up being many times smaller than the original program, but (hopefully) represents only that program The main trick is to avoid collisions, whereby the same fingerprint is computed for different programs, and to come up with a hash function that can't be run in the opposite direction MD5 and SHA are systems for computing one-way hashes over a binary file.

The crypto API provides a way for Java programs to include this functionality MD5 and SHA are useful when it comes to signing code because the act of signing is actually a complicated function of a secret crypto key and the data to be signed The math is hairy enough that it is a much better idea to compute it using a program's hash instead of the program itself Remember, the hash is many times smaller than the program it represents Figure 31 shows the important role that one-way hash functions play in code signingRelated: .

QR Code 2d Barcode In C# Using Barcode generator for . package and not on the back-end functionality that would .manage network connections We explained how to build a server and demonstrated that the same principles can be used to create functional clients Throughout the chapter we focused on the package and not on the back-end functionality that would tailor the code to specific applications We have discussed the basic steps that are required to make use of he network classes and given examples of each one We have also discussed the limitations that the security model imposes on network connections and the implications this has on code design We have provided a method to determine which server supplied the Web page to the browser and therefore which machine the applet can connect to without violating the security rules, and we have advocated not violating those rules with regard to user trust and breakable code Finally, we have discussed a few points which are worthy of consideration when planning network-dependent code After reading this chapter, you should be able to implement both server and client functionality into Java code and have an understanding of the general approach taken by the Java system We feel that the network package is one of the most flexible and important elements of the Java system, and we fully expect to see it become an essential tool in Java development especially in applet development Using the network classes enables a Java applet to reach out beyond the confines of the Web browser and create an environment where the user can access information in a coordinated model, restricted only by the user s capacity to absorb data.Related: 

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