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Nov 2nd, 2004, 9:04 AM
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#1 |
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Newbie
Join Date: Nov 2004
Posts: 7
Rep Power: 0
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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  |
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Nov 2nd, 2004, 9:21 AM
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#2 |
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Hobbyist Programmer
Join Date: Apr 2004
Location: Texas
Posts: 106
Rep Power: 5
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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
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Nov 2nd, 2004, 9:29 AM
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#3 |
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Newbie
Join Date: Nov 2004
Posts: 7
Rep Power: 0
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thank you very much mate!i ll check them out!
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Nov 4th, 2004, 5:04 PM
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#4 |
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The Supreme Ruler
 Join Date: May 2004
Location: Houston
Posts: 1,476
Rep Power: 6
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Also, check out the new Scanner class. Much easier for input, in my opinion.
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