java-io

I get compilation error when I do this cast: RandomAccessFile raf = new RandomAccessFile(...) InputStream is = (InputStream)raf; RandomAccessFile is supposed to subclass InputStream although not directly. From docs: RandomAccessFile implements DataInput which inturn DataInputstream & InputStream Why is this invalid? Also appreciate your input on what would be the right way to use the RandomAccessFile as InputStream ? I am thinking of wrapper approach. RandomAccessFile extends Object , and does not extend InputStream . If you want get an InputStream from a RandomAccessFile I think implementing

I am trying to read a java file and modify it simultaneously. This is what I need to do : My file is of the format : aaa bbb aaa ccc ddd ddd I need to read through the file and get the count of the # of occurrences and modify the duplicates to get the following file: aaa - 2 bbb - 1 ccc - 1 ddd - 2 I tried using the RandomAccessFile to do this, but couldn't do it. Can somebody help me out with the code for this one? It's far easier if you don't do two things at the same time. The best way is to run through the entire file, count all the occurrences of each string in a hash and then write out

I'm running a thread and everytime it runs, It should be checking to see if there is a new line to read from the BufferedReader although, it gets stuck waiting for a line to exist, thus halting the entire code. if((inputLine = bufferedReader.readLine()) != null){ System.out.println(inputLine); JOptionPane.showMessageDialog(null, inputLine); } Is there a way to better check if there is text in a BufferedReader to be read? No, there's no easy way to do that. BufferedReader has a ready call, but that only applies to the read calls, not the readLine call. If you really want a readLine that's

Please move down to the 2nd update. I didn't want to change the previous context of this question. I'm using wkhtmltoimage from a Java app. The standard way of using it is - path-to-exe http://url.com/ image.png . According to their docs, if we write a - instead of an input URL, the input shifts to STDIN. I'm starting the process using ProcessBuilder - ProcessBuilder pb = new ProcessBuilder(exe_path, " - ", image_save_path); Process process = pb.start(); Now I'm unable to figure out how to pipe an input stream to this process. I have a template file read into a DataInputStream , and I'm

I am using BufferedReader.readLine() method to read a response from a remote server (which is written in C and I have no access to source code). BufferedReader br = new BufferedReader(new InputStreamReader(in)); String line; while((line = br.readLine())!=null){ [...] } But it always blocks at the last line until it times out. So I used the following code: int b; while(true){ b = in.read; [...] } and I found out that the last byte read has an integer value of 13, which I think it is a carriage return, right? So why the readLine method blocks? How does the server usually signal an end of stream

I ran namenode -format.This is my output. I tried changing the file permissions chmod 777 hadoop. I believe this line is the error ERROR namenode.NameNode: java.io.IOException: Cannot create directory /your/path/to/hadoop/tmp/dir/hadoop-hadoop/dfs/name/current adoop@alexander-desktop:/usr/local/hadoop/bin$ ./hadoop namenode -format 12/07/03 17:03:56 INFO namenode.NameNode: STARTUP_MSG: /************************************************************ STARTUP_MSG: Starting NameNode STARTUP_MSG: host = alexander-desktop/127.0.1.1 STARTUP_MSG: args = [-format] STARTUP_MSG: version = 0.20.2 STARTUP