Java Reference
In-Depth Information
With Java 7, the normal way to create a BufferedReader is via the static new-
BufferedReader method of the Files class. In addition to a Path parameter corresponding
to the file to be opened, one complication is that a Charset parameter is also required. This
is used to describe the character set to which the characters in the file belong. Charset can be
found in the java.nio.charset package. There are a number of standard character sets, such
as US-ASCII and ISO-8859-1 , and more details can be found in the API documentation for
Charset . Code 12.22 shows the use of these features to read a text file.
Code 12.22
Reading from a text file
with Java 7
import java.nio.charset.Charset;
import java.nio.file.*;
import java.util.*;
public class Responder
. . . fields and methods omitted . . .
* Build up a list of default responses from which we can pick
* if we don't know what else to say.
private void fillDefaultResponses()
Charset charset = Charset.forName( "US-ASCII" );
Path path = Paths.get(FILE_OF_DEFAULT_RESPONSES);
try (BufferedReader reader =
Files.newBufferedReader(path, charset)) {
String response = reader.readLine();
while (response != null ) {
response = reader.readLine();
catch (FileNotFoundException e) {
System.err.println( "Unable to open " +
catch (IOException e) {
System.err.println( "A problem was encountered reading " +
// Make sure we have at least one response.
if (defaultResponses.size() == 0) {
defaultResponses.add( "Could you elaborate on that?" );
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