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DataOutputStream, like other filter output streams, must be attached to another OutputStream In
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this case, it's attached to a FileOutputStream that is set up to write to a file named invoice1txt:
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DataOutputStream out = new DataOutputStream(new FileOutputStream("invoice1txt"));
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Next,DataIODemo uses DataOutputStream's specialized write methods to write the invoice data contained within arrays in the program according to the type of data being written:
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for (int i = 0; i < priceslength; i++) { outwriteDouble(prices[i]); outwriteChar('\t'); outwriteInt(units[i]); outwriteChar('\t'); outwriteChars(descs[i]); outwriteChar('\n'); Table of Contents } Java Tutorial, Third Edition: A Short outclose();
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Next,DataIODemo opens a DataInputStream on the file just written: ByMary Campione,Kathy Walrath,Alison Huml
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Publisher : Addison in = DataInputStream Wesleynew DataInputStream(new FileInputStream("invoice1txt")); Pub Date : December 28, 2000
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DataInputStream also must be attached to another InputStream, in this case, a FileInputStream Pages : 592 set up to read the file just written, invoice1 Then DataIODemo just reads the data back in, using DataInputStream's specialized read methods: try { "This book stands above the rest because it has been available on the web and read by thousands of Java while (true) { authors have received an enormous amount of feedback about which sections programmers The price = inreadDouble(); are good and which sections are confusing; the confusing ones have been improved I doubt that any other JavainreadChar(); book has undergone such //throws out -Metroplex Java User Group, trial by fire" the tab unit = inreadInt(); wwwjavamugorg/reviews/ inreadChar(); //throws out the tab char chr; Whether you're taking a class or learning on the job, The Java(TM) Tutorial, Third Edition , is a handsdesc = new StringBuffer(20); on guide that lets you quickly become proficient with the Java programming language Written by members char lineSep = SystemgetProperty("lineseparator")charAt(0); of the Java Software team at Sun Microsystems, the book uses an interactive approach to
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help you learn the Java platform by example
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while ((chr = inreadChar() != lineSep) {
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descappend(chr); Since its first online release in 1995, the material in The Java(TM) Tutorial has been updated } to reflect reader feedback and new releases of the Java platform This third edition has continuously been thoroughly updated to cover v13 of the Java Platform,unit + " unitsas well as preceding Systemoutprintln("You've ordered " + Standard Edition, of " versions as early as JDK 11 + desc + " at $" + price);
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You will find clear explanations of such fundamentals as objects, classes, and data structures In } addition, the book provides introductions to object-oriented programming, applet construction, and } catch (EOFException e) { } user interface design Other topics include exceptions, I/O, and threads To help beginners avoid many Systemoutprintln("For a TOTAL of: $" + total); common mistakes, an entire chapter is devoted to programming problems and their solutions inclose(); Convenient summaries at the end of each section are new to this edition Also new for this edition are "Questions and Exercises" sections to help you displays a statement summarizing the order and the When all the data has been read, DataIODemo practice what you learn
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total amount owed and then closes the stream After working through the lessons in this proven tutorial, you will be well prepared to use the Java programming that DataIODemo uses or workplace Note the loop language in your schoolto read the data from the DataInputStream Normally, when data is read, you see loops like this:
total = total + unit * price;
while ((input = inread()) != null) { }
Theread method returns a value, null, which indicates that the end of the file has been reached Many of the DataInputStream read methods can't do this, because any value that could be returned to indicate the end of file may also be a legitimate value read from the stream For example, suppose that you want to use 1 to indicate end of file Well, you can't, because 1 is a legitimate value that can be read from the input stream, using readDouble,readInt, or one of the other methods that reads numbers So DataInputStream's read methods throw an EOFException instead When the EOFException occurs, the while(true) terminates When you run the DataIODemo program, you should see the following output:
You've ordered 12 units of Java T-shirt at $1999 You've ordered 8 units of Java Mug at $999 You've ordered 13 units of Duke Juggling Dolls at $1599 You've ordered 29 units of Java Pin at $399 You've ordered 50 units of Java Key Chain at $499 Table of Contents For a TOTAL of: $89288