class Count {
public static void main(String args[])
throws java.io.IOException
{
int count = 0;
while (System.in.read() != -1)
count++;
System.out.println("Input has " + count + " chars.");
}
}
You've already seen the System class being used to
read characters from the standard input stream.
The character-counting program also uses the
System class to display its output.
System.out.println() displays
its string argument followed by a newline.
println() has a companion method
print() that displays it argument
with no trailing newline.
To explicitly specify the newline character use \n.
System.out implements the standard output stream.
The standard output stream is a C library concept
that has been assimilated into the Java language. Simply put, a stream is
a flowing buffer of characters; the standard output stream
is a stream that writes its contents to the display.
The standard output stream is a convenient place
for an old-fashioned text-based application to display
its output.
See Also
java.lang.System
Standard Output and Error Streams from Using System Resources
