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    <p>If you read the file line by line using a <a href="http://docs.oracle.com/javase/7/docs/api/java/io/BufferedReader.html" rel="nofollow"><code>BufferedReader</code></a> (it offers a method <a href="http://docs.oracle.com/javase/7/docs/api/java/io/BufferedReader.html#readLine%28%29" rel="nofollow"><code>readLine()</code></a>), you can then write the output to another file using a <a href="http://docs.oracle.com/javase/7/docs/api/java/io/PrintWriter.html" rel="nofollow"><code>PrintWriter</code></a> and first you write the <code>$</code> character using <a href="http://docs.oracle.com/javase/7/docs/api/java/io/PrintWriter.html#print%28char%29" rel="nofollow"><code>print()</code></a> and then the line you read from the <code>BufferedReader</code> using <a href="http://docs.oracle.com/javase/7/docs/api/java/io/PrintWriter.html#println%28java.lang.String%29" rel="nofollow"><code>println()</code></a>.</p> <p>Note that concatenating strings using the + operator in Java is very slow.</p> <p>Something like this should work (slightly simpler than the sample you found):</p> <pre><code>try (BufferedReader input = new BufferedReader(new FileReader(new File("inputfile.txt"))); PrintWriter output = new PrintWriter(new File("outputfile.txt"))) { String line; while (input.ready() &amp;&amp; ((line = input.readLine()) != null)) { output.print("$"); output.println(line); } } catch (Exception ex) { ex.printStackTrace(); } </code></pre> <p>The above example uses the new Java 7 <a href="http://java.dzone.com/articles/java-7-new-try-resources" rel="nofollow">autoclose feature</a> in the <code>try</code> block to close the streams after the process finishes.</p>
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    1. POHow to insert a character into each line in a txt file
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    1. COHi, thanks it almost works) You see, I added a code here. I got that I can put the System.out.print("s") line, right? but I don't know how to cover it a loop in order to add '$' at the beginning of each line
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    2. CO`System.out.print()` will output to the console. To output in a file you need to create a `new PrintWriter(new File("filename"));`. The loop can be done on the BufferedReader itself using the `ready()`. So you would have `while (br.ready())` and inside it read the next line, write the `$` to the printwriter and write the line you just read from the buffered reader to the printwriter. So just 3 lines.
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    3. COI've put a sample of how it could look like.
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