PreferencesDemo.java Source code

Introduction

Here is the source code for PreferencesDemo.java

Source

// : 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));
    }
} ///:~