PreferenceExample.java Source code

Introduction

Here is the source code for PreferenceExample.java

Source

import java.util.*;
import java.util.prefs.*;
import java.io.*;

public class PreferenceExample {
    public void printInformation(Preferences p) throws BackingStoreException {
        System.out.println("Node's absolute path: " + p.absolutePath());

        System.out.print("Node's children: ");
        for (String s : p.childrenNames()) {
            System.out.print(s + " ");
        }
        System.out.println("");

        System.out.print("Node's keys: ");
        for (String s : p.keys()) {
            System.out.print(s + " ");
        }
        System.out.println("");

        System.out.println("Node's name: " + p.name());
        System.out.println("Node's parent: " + p.parent());
        System.out.println("NODE: " + p);
        System.out.println("userNodeForPackage: " + Preferences.userNodeForPackage(PreferenceExample.class));

        System.out.println("All information in node");
        for (String s : p.keys()) {
            System.out.println("  " + s + " = " + p.get(s, ""));
        }
    }

    public void setSomeProperties(Preferences p) throws BackingStoreException {
        p.put("fruit", "apple");
        p.put("cost", "1.01");
        p.put("store", "safeway");
    }

    public void exportToFile(Preferences p, String fileName) throws BackingStoreException {
        try {
            FileOutputStream fos = new FileOutputStream(fileName);

            p.exportSubtree(fos);
            fos.close();
        } catch (IOException ioe) {
            System.out.println("IOException in exportToFile\n" + ioe);
            ioe.printStackTrace();
        }
    }

    public static void main(String args[]) {
        PreferenceExample pe = new PreferenceExample();
        Preferences prefsRoot = Preferences.userRoot();
        Preferences myPrefs = prefsRoot.node("PreferenceExample");

        try {
            pe.setSomeProperties(myPrefs);
            pe.printInformation(myPrefs);
            pe.exportToFile(myPrefs, "prefs.xml");
        } catch (BackingStoreException bse) {
            System.out.println("Problem with accessing the backing store\n" + bse);
            bse.printStackTrace();
        }
    }
}