package io;

import java.io.*;

import java.util.*;

import java.util.prefs.*;

/**

* RUN:

* javac io/PreferencesDemo.java && java io.PreferencesDemo

*

* OUTPUT:

* Location: Oz

* Footwear: Ruby Slippers

* Companions: 4

* Are there witches?: true

* UsageCount: 1

* How many companions does Doroty have? 4

*/

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));

}

System.out.println("How many companions does Doroty have? "+

prefs.getInt("Companions", 0)

);

}

}