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You could use a combination of InputStream and readers, but starting from Java 1.5+ you can simply use the useful Scanner class as shown here:

Scanner scanner = new Scanner(file).useDelimiter("\\Z");
String fileContent = scanner.next();
scanner.close();

System.out.println(fileContent);

To read the same file but in a line per line basis, replace the previous code with this one:

Scanner scanner = new Scanner(file);
String line = null;
while((line = scanner.nextLine()) != null) {
        System.out.println(line);
}
scanner.close();

The delimiter "\\Z" points to the end of file.