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The interpreted nature of Java technology solves both the binary distribution problem and the version problem; the same Java programming language byte codes will run on any platform.

Architecture neutrality is just one part of a truly portable system. Java technology takes portability a stage further by being strict in its definition of the basic language. Java technology puts a stake in the ground and specifies the sizes of its basic data types and the behavior of its arithmetic operators. Your programs are the same on every platform—there are no data type incompatibilities across hardware and software architectures.

The architecture-neutral and portable language platform of Java technology is known as the Java virtual machine. Specific implementations of the Java virtual machine for specific hardware and software platforms then provide the concrete realization of the virtual machine.

The Java virtual machine is based primarily on the POSIX interface specification—an industry-standard definition of a portable system interface.

Implementing the Java virtual machine on new architectures is a relatively straightforward task as long as the target platform meets basic requirements such as support for multithreading. High Performance Performance is always a consideration. The Java platform achieves superior performance by adopting a scheme by which the interpreter can run at full speed without needing to check the run-time environment.

The automatic garbage collector runs as a low-priority background thread, ensuring a high probability that memory is available when required, leading to better performance. Applications requiring large amounts of compute power can be designed such that compute-intensive sections can be rewritten in native machine code as required and interfaced with the Java platform.

Interpreted, Threaded, and Dynamic The Java interpreter can execute Java bytecodes directly on any machine to which the interpreter and run- time system have been ported. In an interpreted platform such as Java technology-based system, the link phase of a program is simple, incremental, and lightweight.

You benefit from much faster development cycles—prototyping, experimentation, and rapid development are the normal case, versus the traditional heavyweight compile, link, and test cycles. A user working with HotJava Browser can run several animations concurrently while downloading an image and scrolling the page. Multithreading thus results in a high degree of interactivity for the end user. The Java platform supports multithreading at the language level with the addition of sophisticated synchronization primitives: the language library provides the Thread class, and the run-time system provides monitor and condition lock primitives.

While the Java Compiler is strict in its compile-time static checking, the language and run-time system are dynamic in their linking stages. Classes are linked only as needed. New code modules can be linked in on demand from a variety of sources, even from sources across a network. In the case of the HotJava Browser and similar applications, interactive executable code can be loaded from anywhere, which enables transparent updating of applications.

The result is on-line services that constantly evolve; they can remain innovative and fresh, draw more customers, and spur the growth of electronic commerce on the Internet. What drove the enormous boom in Internet technology throughout the s was not so much the network itself as it was the invention of the World Wide Web, which allows users to move from one document to another by clicking on interactive links.

The fundamental concepts, however, are even older; the first Presidential Science Advisor, Vannevar Bush, proposed a similar idea in In , implementers at CERN completed the first browser, a program that displays Web documents in a way that makes it easy for users to follow the internal links to other parts of the Web.

After news of the CERN work spread to other researchers in the physics community, more groups began to create browsers. After the appearance of the Mosaic browser in , interest in the Web exploded. The number of computer systems implementing World Wide Web repositories grew from approximately in to over 35,, in The number of documents available on the World Wide Web has grown rapidly because Internet users can easily create new documents and add them to the Web.

If you want to add a new document to the Web, all you have to do is create a file on a system equipped with a program called a Web server that gives external users access to the files on that system. The individual files exported by the server are called Web pages. HTML documents consist of text along with formatting information and links to other pages elsewhere on the Web. Each page is identified by a uniform resource locator, or URL, which makes it possible for Web browsers to find this page in the sea of existing pages.

One of the particularly interesting aspects of Java is that the virtual machine is not always running on the same machine that houses the programs. A particularly interesting consequence of this design goal is that Java supports the creation of applets, which are programs that run in the context of a network browser. The process of running an applet is even more intricate than the models of program execution presented earlier in the chapter and is described in Figure The author of the Web page writes the 4.

The applet author then uses a Java 6. A verifier program in the browser compiler to generate a file containing checks the byte codes in the applet a byte-coded version of the applet. In this chapter, you have focused on what the programming process involves and how it relates to the larger domain of computer science. Before computer hardware is useful, however, you must specify a sequence of instructions, or program, that tells the hardware what to do.

Such programs are called software. To be an algorithm, the strategy must be clearly and unambiguously defined, effective, and finite. The compiler translates the source file into an object file, which is then linked with other object files to create the executable program. The compiler checks your program against these syntax rules and reports a syntax error whenever the rules are violated.

This type of error, in which your program does not correctly solve a problem because of a mistake in your logic, is called a bug. The process of finding and fixing bugs is called debugging. This process is called software maintenance. Designing a program so that it is easier to maintain is an essential part of software engineering.

The primary feature that sets Java apart from most of its predecessor languages is the fact that it is an object-oriented language, which means that it encapsulates data and the operations on that data into conceptually unified entities called objects. In particular, Java makes it possible to run programs in the context of a web browser.

Programs that run in this way are called applets. Review questions 1. Who is generally regarded as the first programmer? What concept lies at the heart of von Neumann architecture? What is the difference between hardware and software? Traditional science is concerned with abstract theories or the nature of the universe— not human-made artifacts. What abstract concept forms the core of computer science?

What are the three criteria an algorithm must satisfy? What is the distinction between algorithmic design and coding? Which of these activities is usually harder? What is meant by the term higher-level language? What higher-level language is used as the basis of this text? How does an interpreter differ from a compiler? What is the relationship between a source file and an object file? As a programmer, which of these files do you work with directly?

What is the difference between a syntax error and a bug? True or false: Good programmers never introduce bugs into their programs. True or false: The major expense of writing a program comes from the development of that program; once the program is put into practice, programming costs are negligible. What is meant by the term software maintenance? Why is it important to apply good software engineering principles when you write your programs?

What is the fundamental difference between the object-oriented and procedural paradigms? What steps are involved in running an applet under the control of a web browser?

In what ways does running a Java applet differ from running a Java application? Chapter 2 Programming by Example Example is always more efficacious than precept. Hopper became one of the first programmers of the Mark I digital computer, which is the machine visible in the background of this photograph.

Hopper made several contributions to computing in its early years and was one of the major contributors to the development of COBOL, which continues to have widespread use in business-programming applications. In , Hopper became the first woman promoted to the rank of admiral. During her life, Grace Murray Hopper served as the most visible example of a successful woman in computer science. In recognition of that contribution, there is now a biennial Celebration of Women in Computing, which was named in her honor.

Along the way, you will become quite familiar with a particular programming language called Java, but the details of that language are not the main point. Programming is the science of solving problems by computer, and most of what you learn from this text will be independent of the specific details of Java. Even so, you will have to master many of those details eventually so that your programs can take maximum advantage of the tools that Java provides.

From your position as a new student of programming, the need to understand both the abstract concepts of programming and the concrete details of a specific programming language leads to a dilemma: there is no obvious place to start. To learn about programming, you need to write some fairly complex programs. To write those programs in Java, you must know enough about the language to use the appropriate tools.

But if you spend all of your energy learning about Java, you will probably not learn as much as you should about more general programming issues.

Moreover, Java was designed for experts and not for beginning programmers. There are many details that just get in the way if you try to master Java without first understanding something about programming. When you look at these programs, try to understand what is happening in them generally without being concerned about details just yet.

You can learn about those details in Chapters 3 and 4. The main purpose of this chapter and the one that follows is to help build your intuition about programming and problem solving, which is far more important in the long run. The first program to write is the same for all languages: Print the words hello, world This is the big hurdle; to leap over it you have to be able to create the program text somewhere, compile it successfully, load it, run it, and find out where the output went.

With these mechanical details mastered, everything else is comparatively easy. Java is, of course, different from C, but the underlying advice is still sound: The first program you write should be as simple as possible to ensure that you can master the mechanics of the programming process. At the same time, it is important to remember that this is now the 21st century, and the programs that were appropriate to the early s are not the same ones we would use today.

The mechanical teletypes and primitive consoles that were available then have been replaced by more sophisticated displays, and the ability to print a series of words is no longer quite as exciting as it once was.

Today, that output would more likely be directed to a graphical window on the screen. Fortunately, the Java program that does precisely that is still very simple and appears in Figure Although its structure is extremely simple, HelloProgram is typical of the programs you will see in the next few chapters, and you should use it as a model of how Java programs should be organized. Comments The first section of HelloProgram is an English-language comment, which is simply program text that is ignored by the compiler.

In Java, comments come in two forms. Comments are written for human beings, not for the computer. They are intended to convey information about the program to other programmers. When the Java compiler translates a program into a form that can be executed by the machine, it ignores the comments entirely.

In this text, every program begins with a special comment called the program comment that describes the operation of the program as a whole. That comment includes the name of the program file and a message that describes the operation of the program. In this case, the program comment also provides credit for the original idea of the program. Comments might also describe any particularly intricate parts of the program, indicate who might use it, offer suggestions on how to change the program behavior, or provide any additional information that other programmers might want to know about the program.

For a program this simple, extensive comments are usually not necessary. As your programs become more complicated, however, you will discover that good comments are one of the best ways to make them understandable to someone else—or to figure out what you yourself intended if you return to a program after not looking at it for a while.

A library package is a collection of tools written by other programmers that perform specific operations. The libraries used by the HelloProgram are a graphics library and a program library, each of which come from a collection of packages produced by the Association for Computing Machinery ACM. The asterisk at the end of the package name is used to indicate that all components from the relevant package should be imported.

Every program in this book will import at least the acm. Some programs will use additional packages as well and must contain an import line for each one. When you write your own programs, you can use the tools provided by these packages, which saves you the trouble of writing them yourself.

Libraries are critical to programming, and you will quickly come to depend on several important packages as you begin to write more sophisticated programs. The main class The last section of the HelloProgram. A class is the primary unit into which Java programs are divided and constitute a template for the creation of individual objects. As you did when you were introduced to classes in the context of Karel, it is important to understand this program by breaking it down hierarchically.

Here, the extends keyword indicates that HelloProgram is a subclass of GraphicsProgram, which is one of the program types defined in the acm. The specific capabilities of the GraphicsProgram class will be defined in detail in Chapter 7. Programming by Example 25 HelloProgram is a GraphicsProgram and can therefore do any of the things that GraphicsProgram can do, the details of which you will discover later.

The name of this method, as given on its header line, is run. The steps that the method performs are listed between the curly braces and are called statements. Collectively, the statements constitute the body of the method.

The method run shown in the HelloProgram. The method run plays a special role in programs that use the acm. Whenever you run a Java program, the computer executes the statements enclosed in the body of the run method for the main class. In HelloProgram, the body of run consists of the single statement add new GLabel "hello, world" , , 75 ; This statement uses two facilities from the library packages.

The first is the GLabel class, which comes from acm. The part of the line that reads new GLabel "hello, world" creates a new GLabel object containing the text "hello, world". The rest of the line is add newly generated label , , 75 ; which takes the new GLabel and adds it to the graphics program at a position whose x and y coordinates are and The result is that the program produces the following image on the screen: HelloProgram hello, world 2. It would be easy, for example, to change the message from "hello, world" to something more interesting.

You could put that message at a different position on the screen by changing the numbers and 75 to something else. Thus, if you change the y coordinate from 75 to , the message moves downward on the screen. You might also get a feeling for what the units are: Java specifies coordinates in units corresponding to the individual dots on the display screen, which are called pixels. Thus the coordinate pair , 75 indicates a position on the screen that is pixels inward from the left edge of the window and 75 pixels down from the top.

And you could put more than one message on the screen simply by another statement similar in form to the single line in the existing program, but with a different message and location.

The take-home message here is that it is useful to experiment. At some point, of course, you will need to learn about the details of the Java statements so that you can understand how each statement works. This detailed view, however, is not the only useful way to look at a program. Sometimes it helps to stand back and look at a program as a whole. The step-by-step detailed view is an example of a reductionistic approach. If you look at a program from a more global perspective—as a complete entity whose operation as a whole is of primary concern—you are adopting a more holistic perspective that allows you to see the program in a different light.

Reductionism is the philosophical principle that the whole of an object can best be understood by understanding the parts that make it up. Its antithesis is holism, which recognizes that the whole is often more than the sum of its parts. As you learn how to write programs, you must learn to see the process from each of these perspectives.

If you concentrate only on the big picture, you will end up not understanding the tools you need for solving problems. However, if you focus exclusively on details, you will invariably miss the forest for the trees. When you are first learning about programming, the best approach is usually to alternate between these two perspectives.

Figure shows a different kind of program that asks the user to enter two integers which is simply the mathematical term for whole numbers without fractional parts , adds those integers together, and then displays the sum.

First, Add2Integers is a different kind of program, as indicated by its header line: public class Add2Integers extends ConsoleProgram This program extends ConsoleProgram instead of GraphicsProgram, which means that it has access to a different set of facilities. The ConsoleProgram class is designed to support user interaction in a traditional text-based style. A ConsoleProgram can request input from the user and display information back as illustrated in the following diagram, which shows what you might see if you ran the Add2Integers program: Add2Integers This program adds two integers.

Enter n1: 17 Enter n2: 25 The total is Diagrams that show the output that a program produces are called sample runs. Although it may be hard to see in this photocopied edition of the text, the input that the user types appears in blue, as it does on the display when you run this program.

This convention makes it easy to tell which parts of a session are entered by the user and which parts are generated by the program. But even without those signposts, most beginning programmers would have little trouble understanding the function of the code.

Programs are typically easier to read than they are to write. Moreover, just as it is far easier to write a novel after having read a number of them, you will find that it is easier to write good programs if you take the time to read several well-designed programs and learn to emulate their structure and style. The meaning of a particular statement—much like unfamiliar words in a novel—often becomes clear either from the context or from simple common sense. Before going on to look at the explanations that follow, try taking a look at each line of Add2Integers and see how much sense you can make of it working from first principles alone.

The first line in the run method is println "This program adds two integers. The value in parentheses is called an argument and tells the println method what it should display. The double quotes surrounding the text This program adds two integers. The effect of the println method is to display the entire argument string on the console and then to return to the beginning of the next line.

Thus, if you make several println calls in succession, each string in the output will appear on a separate line.

Note that the purpose of the first line in this program is not to tell programmers reading the code what the program does; that function is accomplished by the program comments at the beginning of the file.

The first println statement is there to tell the user sitting at the computer what the program does. The program itself has to make its purpose clear.

If you adopt a reductionistic perspective, however, this line of code introduces several new concepts. Of these, the most important is that of a variable, which is easiest to think of as a placeholder for some piece of data whose value is unknown when the program is written.

The user will enter those integers when the program runs. So that you can refer to these as-yet-unspecified values in your program, you create a variable to hold each value you need to remember, give it a name, and then use its name whenever you want to refer to the value it contains.

Variable names are usually chosen so that programmers who read the program in the future can easily tell how each variable is used. In the Add2Integers program, the variables n1 and n2 represent the integers to be added, and the variable total represents the sum. In Java, the type used to store integer data is called int.

In this case, that expression is readInt "Enter n1: " Just like the println example from the first line, this expression is an invocation of the readInt method in ConsoleProgram. The readInt method begins by displaying its argument on the console so that the user knows what is expected; this type of message is generally called a prompt. Unlike println, however, the readInt method does not return to the beginning of the next line but waits after the prompt for the user to type in an integer.

When the user has finished typing in the integer and hits the Return or Enter key, that integer is then passed back as the result of the readInt method. In programming terminology, we say that readInt returns the value the user typed. When tracing through the operation of a program on paper, programmers often use box diagrams to indicate the values assigned to variables.

If you look back at the sample run presented earlier in this section, you will see that the user entered the value 17 in response to the first input request. Thus, to illustrate that the assignment statement has stored the value 17 in the variable n1, you draw a box, name the box n1, and then indicate its value by writing a 17 inside the box, as follows: n1 17 The third line in the run method is almost exactly the same as the second and reads a value for the variable n2.

The structure of expressions is defined more formally in Chapter 3, but it is often easy to understand what a Java expression means given that they look very much like expressions in traditional mathematics.

To keep track of the result, you need to store it in some variable, and this statement introduces total for precisely this purpose. For the most part, this statement looks like the first statement in the program, which is also a call to the println method.

This operation is called concatenation. If there are any parts of the expression that are not strings, Java converts them into their standard string representation before applying the concatenation operator.

The effect of this last println statement is to display the value of total after adding on the surrounding text. You can see the effect of this statement in the sample run. Although Add2Integers is set up to work only with integers, Java is capable of working with many other types of data.

You could, for example, change this program so that it added two real numbers simply by changing the types of the variables and the names of the input methods, as shown in Figure The most common type of floating-point number in Java is the type double, which is short for double-precision floating-point.

If you need to store floating-point values in a program, you must declare variables of type double, just as you previously had to declare variables of type int to write Add2Integers. The only other change in the program is that the user input is obtained by calling readDouble instead of readInt.

The basic pattern of the program is unchanged. These classes, moreover, are defined as extensions of existing classes supplied by the acm. Whenever you define a new class as an extension of an existing one, the new class is said to be a subclass of the original. Thus, HelloProgram is a subclass of GraphicsProgram. Symmetrically, GraphicsProgram is a superclass of HelloProgram. The concept of a class is one of the most important ideas in Java.

At its essence, a class is as an extensible template that specifies the structure of a particular style of object. An object, as you already know from the discussion in the Karel book, is a conceptually integrated entity that encapsulates both state and behavior.

Each object is an instance of a particular class, which can, in turn, serve as a template for many different objects. If you want to create objects in Java, you must first define the class to which those objects belong and then construct individual objects that are instances of that class.

Class hierarchies Classes in Java form hierarchies. Liberty: A History Of Artisan Bread In Five Newton's Football: The Science Big Data Analytics Strategies Configuration Management: Expert Guidance Face Processing: Advanced Modeling Formulas Of Acoustics springer Developing Information Systems: Practical This book is intended for Python programmers who want to add machine learning to their repertoire, either for a specific project or as part of keeping their toolkit relevant.

Perhaps a new problem has come up at work that requires machine learning. To run the code examples in the book, you need to have Python 2. These can be difficult to install due to cross-dependencies and version issues.

Their Anaconda product is a free download and includes Python 2. Save my name, email, and website in this browser for the next time I comment. Notify me of follow-up comments by email.