Java Reference
In-Depth Information
Caution
Avoidusingthestringconcatenationoperatorinalengthyloopbecauseit
results in the creation of many unnecessary
StringBuilder
and
String
objects.
System
The
java.lang.System
classprovidesaccesstosystem-orientedresources,includ-
ing standard input, standard output, and standard error.
System
declares
in
,
out
,and
err
classfieldsthatsupportstandardinput,standard
output, and standard error, respectively. The first field is of type
java.io.InputStream
, and the last two fields are of type
java.io.PrintStream
. (I will formally introduce these classes in
Chapter 8
.)
System
also declares various
static
methods, including those methods that are
described in
Table 4-6
.