// If no console available, exit.
if(con == null) return;
// Read a string and then display it.
str = con.readLine("Enter a string: ");
con.printf("Here is your string: %s\n", str);
Here is sample output:
Enter a string: This is a test.
Here is your string: This is a test.
Using Stream I/O
The following example demonstrates several of Java's I/O character stream classes and
methods. This program implements the standard wc (word count) command. The program
has two modes: If no filenames are provided as arguments, the program operates on the
standard input stream. If one or more filenames are specified, the program operates on
each of them.
// A word counting utility.
class WordCount
public static
int words = 0;
public static
int lines = 0;
public static
int chars = 0;
public static void wc(InputStreamReader isr)
throws IOException {
int c = 0;
boolean lastWhite = true;
String whiteSpace = " \t\n\r";
while ((c = != -1) {
// Count characters
// Count lines
if (c == '\n') {
// Count words by detecting the start of a word
int index = whiteSpace.indexOf(c);
if(index == -1) {
if(lastWhite == true) {
lastWhite = false;
else {
lastWhite = true;
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