42 lines
1.3 KiB
Java
42 lines
1.3 KiB
Java
// preferences/PreferencesDemo.java
|
|
// (c)2017 MindView LLC: see Copyright.txt
|
|
// We make no guarantees that this code is fit for any purpose.
|
|
// Visit http://OnJava8.com for more book information.
|
|
import java.util.prefs.*;
|
|
|
|
public class PreferencesDemo {
|
|
public static void
|
|
main(String[] args) throws Exception {
|
|
Preferences prefs = Preferences
|
|
.userNodeForPackage(PreferencesDemo.class);
|
|
prefs.put("Location", "Oz");
|
|
prefs.put("Footwear", "Ruby Slippers");
|
|
prefs.putInt("Companions", 4);
|
|
prefs.putBoolean("Are there witches?", true);
|
|
int usageCount = prefs.getInt("UsageCount", 0);
|
|
usageCount++;
|
|
prefs.putInt("UsageCount", usageCount);
|
|
for(String key : prefs.keys())
|
|
System.out.println(key + ": "
|
|
+ prefs.get(key, null));
|
|
// You must always provide a default value:
|
|
System.out.println(
|
|
"How many companions does Dorothy have? " +
|
|
prefs.getInt("Companions", 0));
|
|
}
|
|
}
|
|
/* Output:
|
|
Location: Oz
|
|
Footwear: Ruby Slippers
|
|
Companions: 4
|
|
Are there witches?: true
|
|
UsageCount: 58
|
|
How many companions does Dorothy have? 4
|
|
___[ Error Output ]___
|
|
May 02, 2017 3:23:40 PM java.util.prefs.WindowsPreferences
|
|
<init>
|
|
WARNING: Could not open/create prefs root node
|
|
Software\JavaSoft\Prefs at root 0x80000002. Windows
|
|
RegCreateKeyEx(...) returned error code 5.
|
|
*/
|