Programming Forums - Java I/o Help

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- - Java I/o Help (http://www.programmingforums.org/showthread.php?t=1016)

i ve been trying to find a way to successfully read text files and the be able either to read their data on screen or write their data to another text file.unfortunately i have not achieved yet.could anybody please write me a simple example of java code which reads for example the first,third and fourth line of a text file and another program that reads and writes the same lines to another text file?how can i read the entire file contents?
i am sorry i am asking so many things but i am disappointed and confused.... :(

thanks in advance guys :)

Reading a file's contents: (from http://javaalmanac.com/egs/java.io/R...sFromFile.html)

 * *try {

 * * * *BufferedReader in = new BufferedReader(new FileReader("infilename"));

 * * * *String str;

 * * * *while ((str = in.readLine()) != null) {

 * * * * * *process(str);

 * * * *}

 * * * *in.close();

 * *} catch (IOException e) {

 * *}

Read from one file and write to another: (from http://javaalmanac.com/egs/java.io/CopyFile.html?l=new)

 * *// Copies src file to dst file.

 * *// If the dst file does not exist, it is created

 * *void copy(File src, File dst) throws IOException {

 * * * *InputStream in = new FileInputStream(src);

 * * * *OutputStream out = new FileOutputStream(dst);

 * *

 * * * *// Transfer bytes from in to out

 * * * *byte[] buf = new byte[1024];

 * * * *int len;

 * * * *while ((len = in.read(buf)) > 0) {

 * * * * * *out.write(buf, 0, len);

 * * * *}

 * * * *in.close();

 * * * *out.close();

 * *}

hope that will help get your started. Note the classes used to read and write. You can find them in the JavaTM 2 Platform, Standard Edition, v 1.4.2 API Specification under java.io

thank you very much mate!i ll check them out!:)

Also, check out the new Scanner class. Much easier for input, in my opinion.