Java Reference
In-Depth Information
To make it print better, you should provide an implementation of
toString()
that prints the
class name and some of the important states in all but the most trivial classes. This gives you
formatting control in
println()
, in debuggers, and anywhere your objects get referred to in
a
String
context. Here is the previous program rewritten with a
toString()
method:
public
public class
class
ToStringWith
ToStringWith
{
int
int
x
,
y
;
/** Simple constructor */
public
public
ToStringWith
(
int
int
anX
,
int
int
aY
) {
x
=
anX
;
y
=
aY
;
}
@Override
public
public
String
toString
() {
return
return
"ToStringWith["
+
x
+
","
+
y
+
"]"
;
}
/** Main just creates and prints an object */
public
public static
void
main
(
String
[]
args
) {
System
.
out
.
println
(
new
static
void
new
ToStringWith
(
42
,
86
));
}
}
This version produces the more useful output:
ToStringWith[42,86]
See Also
This example uses
String
concatenation, but you may also want to use
String.format()
