Java Reference
In-Depth Information
favorite_programming_language=Java
pencil_color green
Fortunately, when a
Properties
object writes itself to a file, it uses the simple format:
key=value
Here is an example of a program that creates a
Properties
object and adds into it the list of
companies and their locations from
Mapping with Hashtable and HashMap
.
It then loads ad-
ditional properties from disk. To simplify the I/O processing, the program assumes that the
Properties file to be loaded is contained in the standard input, as would be done using a
command-line redirection on either Unix or DOS:
public
public class
class
PropsCompanies
PropsCompanies
{
public
public static
static
void
void
main
(
String
[]
argv
)
throws
throws
java
.
io
.
IOException
{
Properties props
=
new
new
Properties
();
// Get my data
props
.
put
(
"Adobe"
,
"Mountain View, CA"
);
props
.
put
(
"IBM"
,
"White Plains, NY"
);
props
.
put
(
"Learning Tree"
,
"Los Angeles, CA"
);
props
.
put
(
"Microsoft"
,
"Redmond, WA"
);
props
.
put
(
"Netscape"
,
"Mountain View, CA"
);
props
.
put
(
"O'Reilly"
,
"Sebastopol, CA"
);
props
.
put
(
"Sun"
,
"Mountain View, CA"
);
// Now load additional properties
props
.
load
(
System
.
in
);
// List merged properties, using System.out
props
.
list
(
System
.
out
);
}
}
Running it as:
java structure.PropsCompanies < PropsDemo.out
