Writing and Reading Files - Java 7 for Absolute Beginners - page 161

between the original and the reversed content. Listing 8-17 shows the code with the additional and
changed lines highlighted.
Listing 8-17. Appending rather than replacing
package com.apress.java7forabsolutebeginners.examples;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
public class WriteFile {
public static void main(String[] args) {
// Specify the file
String fileName = "C:" + File.separator + "test"
+ File.separator + "Hamlet.txt";
File hamletFile = new File(fileName);
// Set up a byte array to hold the file's content
byte[] content = new byte[0];
try {
// Create an input stream for the file
FileInputStream hamletInputStream = new FileInputStream(hamletFile);
// Figure out how much content the file has
int bytesAvailable = hamletInputStream.available();
// Set the content array to the length of the content
content = new byte[bytesAvailable];
// Load the file's content into our byte array
hamletInputStream.read(content);
// Close the stream
hamletInputStream.close();
} catch (FileNotFoundException fnfe) {
System.out.println("Couldn't find a file called " + fileName);
} catch (IOException ioe) {
System.out.println("Couldn't read from a file called " + fileName);
}
// Reverse the contents of our array, just so we'll
// know we did something to the file's content
reverseByteArray(content);
try {
// Create a stream for our output
FileOutputStream hamletOutputStream
= new FileOutputStream(hamletFile, true);
// Write a newline character to separate the
// original content from the new content.
hamletOutputStream.write('\n');
// Write our output to the file output stream
// (and thus to our file)
hamletOutputStream.write(content);