bufferedreader

Sorry if this is an obvious question, but I can't seem to get it. I'm working on an assignment for a Data Structures course. It involves pulling data from a simple .dat file. We had never used any of the file-accessing options in Java before, so the professor just gave us the working code for that piece. A class called FileReadExample creates a new BufferedReader object, opens a file, and then is supposed to kick out a bunch of data about that file. But I cannot access any of the data at all. In a separate testMain file, I created a new FileReadExample object named fr and then attempted to

I would like to know the specific difference between BufferedReader and FileReader . I do know that BufferedReader is much more efficient as opposed to FileReader , but can someone please explain why (specifically and in detail)? Thanks. In simple manner: A FileReader class is a general tool to read in characters from a File. The BufferedReader class can wrap around Readers, like FileReader, to buffer the input and improve efficiency. So you wouldn't use one over the other, but both at the same time by passing the FileReader object to the BufferedReader constructor. Very Detail FileReader is

Reader rdr = new InputStreamReader(System.in); BufferedReader br = new BufferedReader(rdr); String s; s = br.readLine(); br.close(); Scanner sc = new Scanner(System.in); s = sc.nextLine(); System.out.print(s); I've noticed that if I close the BufferedReader , I won't be able to insert input from the keyboard anymore, as System.in is somehow closed. Is there anyway I can keep br.close() (I need that in order to delete a file) and then add more input from the keyboard? Looks like you need: http://commons.apache.org/io/apidocs/org/apache/commons/io/input/CloseShieldInputStream.html Wrap that

I am using class BufferedReader to read line by line in the buffer. When reading the last line in the buffer, I want to start reading from the beginning of the buffer again. I have read about the mark() and reset() , I am not sure its usage but I don't think they can help me out of this. Does anyone know how to start reading from the beginning of the buffer after reaching the last line? Like we can use seek(0) of the RandomAccessFile ? mark/reset is what you want, however you can't really use it on the BufferedReader, because it can only reset back a certain number of bytes (the buffer size).

I have to open a .exe file from my Java program. So I tried following code First. Process process = runtime.exec("c:\\program files\\test\\test.exe"); But I was getting some error. Then I found out that the exe has to be launched from that location that is c://program files/test/ only then it will open with out errors. So I decided to write a .bat file and execute so that it will cd to that location and execute the .exe file. Following is my code: BufferedWriter fileOut; String itsFileLocation = "c:\\program files\\test\\" System.out.println(itsFileLocation); try { fileOut = new BufferedWriter

I am making an HTTP get request to a website for an android application I am making. I am using a DefaultHttpClient and using HttpGet to issue the request. I get the entity response and from this obtain an InputStream object for getting the html of the page. I then cycle through the reply doing as follows: BufferedReader r = new BufferedReader(new InputStreamReader(inputStream)); String x = ""; x = r.readLine(); String total = ""; while(x!= null){ total += x; x = r.readLine(); } However this is horrendously slow. Is this inefficient? I'm not loading a big web page - www.cokezone.co.uk so the

I'm reading a local file using a BufferedReader wrapped around a FileReader: BufferedReader reader = new BufferedReader(new FileReader(fileName)); // read the file // (error handling snipped) reader.close(); Do I need to close() the FileReader as well, or will the wrapper handle that? I've seen code where people do something like this: FileReader fReader = new FileReader(fileName); BufferedReader bReader = new BufferedReader(fReader); // read the file // (error handling snipped) bReader.close(); fReader.close(); This method is called from a servlet, and I'd like to make sure I don't leave any