1. Problems with BufferedReader / PrintWriter? stackoverflow.comI'm using BufferedReader and PrintWriter to go through each line of an input file, make a change to some lines, and output the result. If a line doesn't undergo a change, ... |
2. Difference between PrintWriter.printf and PrintWriter.format methods stackoverflow.comIs there any difference between the Java PrintWriter methods printf and format? The doc says printf is a convenience method but if it behaves exactly as format, I don't understand what's ... |
3. PrintWriter exception: String index out of range stackoverflow.comI'm trying to read a file then append some text to a certain place in the file (ie. @ offset jabjab). The problem occurs when i'm trying to write to the ... |
4. String assembly by StringBuilder vs StringWriter and PrintWriter stackoverflow.comI recently encountered an idiom I haven't seen before: string assembly by StringWriter and PrintWriter. I mean, I know how to use them, but I've always used StringBuilder. Is ... |
5. Specifying file location for PrintWriter class (Java) and automatically appending .txt stackoverflow.comso let's say I ask the user to specify what he wants to call a new file |
6. Dead Simple but lengthy Java PrintWriter problem stackoverflow.comThe problem is it finds the key word "dodge" creates the file but doesn't write to it. I had this problem earlier and I flushing then closing the file fixed it, ... |
7. My PrintWriter's value becomes void when used in different classes stackoverflow.comI'm new at programming and I need help with this little hurdle. I'm making a simple chat program, with a server and a chat client. So my client starts, and creates ... |
8. Why need PrintWriter? stackoverflow.comI am really confused about the purpose of various io classes, for example, If we have BufferedWriter, why we need a PrintWriter? |
9. Java printwriter stackoverflow.comI have a proxy class, that receives a request and send the request to another server and gets the response and directs it back to original requestor. I use a socket ... |
10. PrintWriter and byte[] problem stackoverflow.com |
11. PrintWriter sends the first message only stackoverflow.comI have seen a similar problem as mine but I still wasn't able to resolve this.I am trying to do a relay chat. I've done all the flushing. I even ... |
12. PrintWriter in java giving unexpected behaviour stackoverflow.comjava using pw.println but output is null ... |
13. PrintWriter append method not appending stackoverflow.comThe following method only writes out the latest item I have added, it does not append to previous entries. What am I doing wrong? |
15. Regarding PrintWriter bytes.com |
16. PrintWriter please help coderanch.com
import java.io.*; import java.util.*; class rd2 { public static void main(String a []) throws IOException { Vector v = new Vector(); FileReader fr1 = new FileReader("c:\\read.txt"); Filewriter fw1 = new FileWriter("c:\\out.txt"); BufferedReader br1 = new BufferedReader(fr1); PrintWriter pw1 = new PrintWriter(fw1); String str ; while ((str = b1.readLine()) ! = null) { v.addElement(str); } System.out.println(v.size()); for (int i ... |
18. PrintWriter Purpose coderanch.comIt does not do much that a Writer does not do. Both Writers and PrintWriters accept Strings as input. PrintWriter has methods called print() and println() that are similar to those methods in PrintStream. PrintWriter is mainly meant for people who are upgrading their character streams from PrintStreams (8-bit) to Writers (16-bit) so that they can use the same API. |
19. PrintWriter - autoFlush coderanch.comHello, Would like to know the meaning of the autoFlush variable in the PrintWriter constructor. I created a small program with autoFlush as false and the true, but both give me same output. Could any1 pls convey the meaning of this. From the API: PrintWriter(Writer out, boolean autoFlush) Create a new PrintWriter. autoFlush - A boolean; if true, the println() methods ... |
20. Basic I/O: PrintWriter coderanch.comHi All, I have a very basic I/O question concerning PrintWriter. I am basically new to JAVA, so any help would be appreciated. I have a method: public void onResponseSent(PrintWriter writer){ } How can I call this method?. My main aim is to transfer the contents of an XML file from one class to this class using the above method. In ... |
21. PrintWriter / ResponseWriter throwing an excpetion. coderanch.comThis is a part of my product's code: Object oData = oPartData.getPartContent(); if( oData instanceof String ) { out.write( (String)oData ); } else { InputStream oPartToDisplayStream = (InputStream)oData; try { byte[] buf = new byte[4 * 1024]; // 4K buffer int bytesRead; while ((bytesRead = oPartToDisplayStream.read(buf)) != -1) out.write( new String(buf), 0, bytesRead); } finally { if (oPartToDisplayStream != null) oPartToDisplayStream.close(); ... |
22. Question about Printwriter coderanch.comI've seen the same suggestion to a number of questions on this board, "Try it and see". However, there are things you can do in most languages that are unsupported but still work. Along comes a new SDK release, or just a different execution path, and the same thing doesn't work. In this case, a closed file can be reused if ... |
23. append method of PrintWriter coderanch.comThe documentation says that the append methods work exactly the same as the matching write records. The only difference is that the append methods participate in implementing the Appendable interface and the write methods don't. So next question, what is the purpose of implementing the Appendable interface? Well, reading the documentation again, it says "The Appendable interface must be implemented by ... |
24. Is PrintWriter Buffered? coderanch.com |
25. PrintWriter: File is getting terminated prematurely without any errors coderanch.comHello, new PrintWriter(new OutputStreamWriter(new FileOutputStream("filename"))) I am using a printWriter as given above to write large amounts of data. There is also a considerable (sometime 15 mins) wait for loading data from database that needs to be written to the file. The problem is that the file is getting terminated prematurely. I checked all the log file, there are no signs ... |
26. PrintWriter Problem? coderanch.comI am using PrintWriter to output the results of my query that has 6,000 records. It properly inserts them into the database but not outputting to a text file. It stops printing the results at about 5000 out of the 6000 rows (records). ... StringBuffer insertBfr = new StringBuffer(); insertBfr.append("INSERT INTO x_table VALUES (").append( so forth.... logfile.println(insertBfr.toString()); Is there a limit ... |
27. PrintWriter format and printf methods coderanch.comCan someone explain the reason that these methods returns itself? There must be some benefit, but for the life of me, I can't see what it is. I've looked around a bit, but haven't even found any examples where printf or format are called and the return value is used. Thanks. Kevin |
28. PrintWriter questions coderanch.com |
29. Need Printwriter help!!!! coderanch.comHowdy partners, Trying to do some file inpu/output with java (am I crzay or what!) Anyway here is my print method: ------------------------------- public String printFinishQ() { for (int i = 0; i < nextJob; i++) { output += theQueue[i].getJobnumber() + " " + theQueue[i].getOgtime() + " " + theQueue[i].getFinishtime() + " " + (theQueue[i].getFinishtime()-theQueue[i].getOgtime()) + " " + "\n"; } return ... |
30. PrintWriter coderanch.comWith only the code snippet you supplied, it's hard to say what the possible cause of the errors may be. It may be due to code not being placed inside a method. Try this code snippet and it should work fine. import java.io.*; /** * @author John Dell'Oso * */ public class PWTest { public static void main(String[] args) { try ... |
31. PrintWriter coderanch.com |
32. Creating a new file using PrintWriter. coderanch.comimport java.io.*; import java.util.*; public class TextReader { public static void main(String[] args) throws IOException { Scanner in = new Scanner(new FileReader("input.txt")); while(in.hasNextLine()){ String line = in.nextLine(); StringBuffer strBuf = new StringBuffer(line); //inserts "CMIS 141" into the text before the word "programming" strBuf.insert(17, "My name is John. "); //Display the contents of the StringBuffer class System.out.println(strBuf); //Adds the text "I hope ... |
33. Cannot be applied to (java.io.PrintWriter) error coderanch.comHi guys I get the following errors when trying to compile this PayApp program and I was wondering how to solve it printPay() in PaySlip cannot be applied to (java.io.PrintWriter) slip.printPay(slipWrite) import java.io.*; public class PayApp { public static void main(String[] args) { boolean end_of_file = false; EmpInFile f1 = new EmpInFile(); EmpOutFile f2 = new EmpOutFile(); Employee emp = null; ... |
34. Problem Using PrintWriter class ! coderanch.comHey guys, i am using File class with PrintWriter class, when i declare File class object it works wel but when i am creating the PrintWriter class object it show me error message (UnHandled Exception Type FileNotFoundException) what should i do here is the program please correct it and give me working version. Thanks, Muzafar import java.io.*; import java.util.Scanner; //student class ... |
35. Unexpected characters using PrintWriter coderanch.comHi, I am using Velocity to generate a script file, the script file producted however contains an extraneous last line as follows: 'java.io.PrintWriter@5f805f80' The code is: private void createDSJython(){ try{ //build Jython VelocityEngine ve = new VelocityEngine(); ve.init(); VelocityContext context = new VelocityContext(); context.put("jndiName", dsAttrs); Template t = ve.getTemplate( "testDs.vm" ); /* now render the template into a Writer */ BufferedWriter ... |
36. Printwriter vs System.out.println() coderanch.com |
37. Very basic question on PrintWriter println method coderanch.comHello All, I have a very basic question on the usage of PrintWriter println method. I know from the API that println would append a new line character when used. But when I executed the below code PrintWriter out=res.getWriter(); //assume that we acquired the HttpSession out.println(session.getCreationTime()); out.println(session.getId()); out.println(session.isNew()); I was expecting the values to be printed on new line for every ... |
38. Problem with PrintWriter and another Problem with Inputhandling coderanch.comHello, I'm new to Java and a "jung" boy from Germany. So sorry for my bad english. Ok, I've got two Problems: 1. I save the Informations from my Program to a txt-File. PrintWriter pw = new PrintWriter(saveFile); for (i = 0, j = elements.size(); i < j; i++) { pw.println(elements.get(i).getId()); pw.println(elements.get(i).getDescription()); pw.println(elements.get(i).getAmount()); pw.println(elements.get(i).getPrice()); } pw.close(); This saves the float-value (getPrice()) ... |
39. PrintWriter coderanch.com |
40. formatting a very large string for a PrintWriter? coderanch.comI have a use case where I need to read a text file read a text file (possibly quite a large one) into an InputStream and then display the contents to the System.out. Simple enough, I am using the 1.6 Console class to access it's, which is pretty much -> PrintWriter.println(mytext). This works fine, except that the entire contents are just ... |
41. Unexpected characters using PrintWriter java-forums.orgHi, I am using Velocity to generate a script file, the script file producted however contains an extraneous last line as follows: 'java.io.PrintWriter@5f805f80' The code is: private void createDSJython(){ try{ //build Jython VelocityEngine ve = new VelocityEngine(); ve.init(); VelocityContext context = new VelocityContext(); context.put("jndiName", dsAttrs); Template t = ve.getTemplate( "testDs.vm" ); /* now render the template into a Writer */ BufferedWriter ... |
42. Help with printwriter. java-forums.orgHi! Im using print writter to write txt to a txt file. Now I have a problem. Yes when i start a new pritnwriter it will over write all other text So THERFORE I made it so that it will first write the previus content then write the new content. But STILL it over writes the previus content that it just ... |
43. PrintWriter doesnt work :( java-forums.orgpublic static void saveMap(String mapName,Node rootNode){ PrintWriter pw; try { pw = new PrintWriter(new FileWriter(MainClass.dir+mapName)); List |
44. Help with PrintWriter code java-forums.org |
45. Help with printwriter class java-forums.orgI really dont' know my mistakes. In the main file, i put: public static void main(String[] args) throws Exception { message u = new message(); file c = new file(); In printwriter class, I put: public class file { public void println()throws Exception { PrintWriter po = null; if (appendToFile) { io = new PrintWriter(new FileWriter("myfile.txt",true)); } io = new PrintWriter(new ... |
46. java PrintWriter java-forums.org |
47. printwriter java-forums.org |
48. Need help with PrintWriter! java-forums.org |
49. PrintWriter problems java-forums.orgprivate Socket socket = null; private InputStreamReader input = null; private OutputStream output = null; private BufferedReader reader = null; private PrintWriter writer = null; HTTPThread(Socket client) { try { socket = client; input = new InputStreamReader(client.getInputStream()); reader = new BufferedReader(input); output = client.getOutputStream(); writer = new PrintWriter(output, true); } catch (IOException e) { // Error accessing socket streams System.out.print("Error accessing ... |
50. PrintWriter appending when I don't want it to forums.oracle.comThanks warnerja. You hit the nail on the head. I read your line, took myself 5 seconds to go and read something in the code, and I found the problem right away(I've also been taking a break, that might have helped some ;)) The above code was simplified. What I really did was to loop through a LinkedList for strings and ... |
51. help with printwriter class forums.oracle.comwhat i am trying to do is use the printwriter to write to a file and also name that file. i already have the the code of what i want to write, but what i can't seem to find is how do i take the file name that the user wants to use and implement it into the printwriter. i can ... |
52. difference between System.out.println(..)and PrintWriter.println(..) forums.oracle.comHello every one With System.out.println(..) we can print to Console. But System.out internally creates PrintWriter object.So why cant we use PrintWriter.println(..) directly to write to console. Is there aany disadvvantage with PrintWriter.println(..). If so can anyone please tell me what is that and what is the advantage we r going to get with System.out.println(..) method of writing to console. |
53. Reading/Writing files using BufferedReader and PrintWriter forums.oracle.com/* read each line from the inputStream and write it to the outputStream * based on the business rules */ while ( ( currentBuffer = inputStream.readLine() ) != null ) { // remove lines that contain only a newline character if ( currentBuffer.length() > 1 ) { /* remove leading '&&&' from each record */ if ( currentBuffer.indexOf("&&&") == 0 ) ... |
54. notepad...wordpad.....PrintWriter! forums.oracle.com |
55. why using BefferedReder and PrintWriter if we have Input/OutputStream forums.oracle.comEverything that is a InputStream/OutputStream is used to handle raw byte streams. Everything that is a Reader/Writer is used to handle character data. In your case the InputStreamReader provides the conversion from raw bytes to character data. Usually it does so using some specified encoding, in your case it uses your platform default encoding. The PrintWriter does the same for the ... |
56. Need help with PrintWriter forums.oracle.comCan you be more precise about what the problem is? Do you just not know how to accomplish something? Did you try something and it wouldn't compile? Does it compile but not run? Does it run but give bad results? Also, when you have lots of arrays that you're walking through in parallel, that usually means that you didn't arrange your ... |
57. PrintWriter forums.oracle.comYes, well, I can understand you saying this is an overly complicated solution. But, you know what, after banging my head for three or four days over something that seems simple to you veterans, I was just trying to find something that worked. I was told to use an array, traverse the binary search tree in a preorder fashion, then write ... |
58. How to close PrintWriter? forums.oracle.comIt has nothing to do with closing the writer. Every writer written as part of the standard libraries has close in its finalizer. Although the jvm doesn't guarantee when or if the finalizer will actually run, it usually does, and you wouldn't be consistently seeing it erase your file. No, your problem is that you open a print writer to the ... |
59. PrintWriter to String forums.oracle.com |
60. Problems with PrintWriter forums.oracle.com/** * tests appending character output to an already existing text file * uses PrintWriter wrapping a BufferedWriter wrapping a FileWriter. * By constructing the FileWriter with a "true" boolean parameter, I am * telling it to append text to an existing file. * * Also uses System.getProperty("line.separator") to get the line separator * for whatever system I happen to be ... |
61. PrintWriter ... empty file forums.oracle.com |
62. transferred code from PC to MAC - PrintWriter NOT working forums.oracle.com |
63. PrintWriter strange behaviour forums.oracle.comMelanie (a) Don't use a PrintWriter for anything critical (or transactional, or networked). They swallow exceptions. Use a BufferedWriter and insert the newlines yourself with BufferedWriter.newLine(). (b) Close the output first before the input (it's more important, and if you happen to get some weird IOException closing the input the output would never get closed, although I've never seen that in ... |
64. Printwriter Question forums.oracle.com |
65. PrintWriter problems! forums.oracle.comOn a different forum I have been working to fix a program. In that program I have four methods to check if a password is valid or not and the information is being imported from an existing text file. Is there a way to pull information created from many different methods being used during a program and save it to an ... |
66. PrintWriter Limitations? forums.oracle.comcalling close() automatically flushs the data out of PrintWriter's buffer onto wherever it's intended to go, see the flush() method in the api for more info. when you call write() on an output stream it stores it into it's buffer instead of writing straight to your file until the buffer itself overflows or is flushed, that way less I/O operations are ... |
67. Printwriter question forums.oracle.com |
68. strange PrintWriter problem forums.oracle.comI didn't look at your code just making a wild guess. Perhaps you are closing the writer each time. So the next time it comes to writing you simply overwrite what is already in the file. You can use a FileWriter instead and the constructor which has a boolean that allows you to append to a file. |
69. Regarding PrintWriter.close() forums.oracle.comHi- I have instantiated PrintWriter object and written a code for writing into a file. pw.write("ABCD"); pw.close(); pw.write("something"); According to java docs the above code should throw an IOException, but it did not. It is printing "ABCD" into the file but not printing "something" and not throwing any error. Can anybody tell me what would be the reason. Thanks in Advance ... |
70. Printwriter Problem forums.oracle.comThank you all for the replies. Im just wondering, no matter what method we use to write data to the stream will it always write as a byte stream ? my knowledge with regard to this area is a bit low. So you'll have to excuse me if my questions are immature. |
71. BufferedReader and PrintWriter question forums.oracle.com"cannot find symbol" (with library methods) is often the compiler's way of saying you have the arguments wrong. In this case you are sending the FileWriter constructor a Scanner argument. There is no such constructor. You have the scanner, but you're supposed to use it to find out what file name the user wants! |
72. Why no compiler error - PrintWriter forums.oracle.com |
73. PrintWriter question forums.oracle.com |
74. PrintWriter problems forums.oracle.com |
75. printWriter Creation forums.oracle.comHi I was just wondering how it would be possible to check if a printwriter has been successfully closed; I have the following code, wil this work? Also what state will out go into once it has been closed, does it then equal null? if i have try { printWriter out = new PrintWriter("blah"); out.close(); } catch (Exception e) { if ... |
76. problem with PrintWriter class forums.oracle.comWhile testing of the application we have a senario where we are trying to write a file to say "Floppy Drive" which is full. But in my case it's not throwing IOException when I am wrtting a Chinese text file (in UTF-8 encoding) to a floppy drive which is full. Earlier for wrtting simple English text I was using simply FileWriter ... |
77. Basic Java Help (BufferedReader and PrintWriter) forums.oracle.comgame = new GameSession(socket); acceptPlayer(); System.out.println("Server closing down"); } } // end class which also seems to be about what the question asks, yet i have to link this to the GameSession class sending it a reference of the socket. Which i think i have with the inclusion of the new GameSession(socket). When i come to write the GameSession class i ... |
78. Why PrintWriter methods do not throws exceptions? forums.oracle.com |
79. PrintWriter does not always send (?) forums.oracle.comIt mightn't be. There are a few other things. (a) readLine() will return null rather than throwing an EOFException, so your catch block for EOFException is misleading. (b) You havea couple of catches for IOException where you don't print out the real exception text, so you're missing out on some pretty important information. (c) You should always close the socket output ... |
80. Problem with PrintWriter forums.oracle.comHi , I am using java1.4 I write following code. Problem is : In the end new file is created , but it is empty nothing is written in that file . Why ? line1 and line2 should be placed in the file , why it is not happening ? import java.io.*; class Test { public static void main(String args[]) { ... |
81. Problem with PrintWriter forums.oracle.comHi , I am using java1.4 I write following code. Problem is : In the end new file is created , but it is empty nothing is written in that file . Why ? line1 and line2 should be placed in the file , why it is not happening ? import java.io.*; class Test { public static void main(String args[]) { ... |
82. Possible to use both a PrintWriter and BufferedOutputStream? forums.oracle.comI have made a PrintWriter and BufferedOutputStream on the same socket that my client uses to connect to the server. I start by sending some string with the PrintWriter followed by some bytes with the BufferedOutputStream. I does not work, so I would like to know if its not possible to connect these to out channels to the same socket. |
83. PrintWriter forums.oracle.com |