// : c12:PreferencesDemo.java
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
import java.util.Arrays;
import java.util.Iterator;
import java.util.prefs.Preferences;
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);
Iterator it = Arrays.asList(prefs.keys()).iterator();
while (it.hasNext()) {
String key = it.next().toString();
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));
}
} ///:~