Example usage for java.util.prefs Preferences keys

Introduction

In this page you can find the example usage for java.util.prefs Preferences keys.

Prototype

public abstract String[] keys() throws BackingStoreException;

Source Link

Document

Returns all of the keys that have an associated value in this preference node.

Usage

From source file:PreferenceExample.java

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

    myPrefs.put("A", "a");
    myPrefs.put("B", "b");
    myPrefs.put("C", "c");

    for (String s : myPrefs.keys()) {
        System.out.println("" + s + "= " + myPrefs.get(s, ""));
    }//w w w.ja v a 2  s. c o  m

}

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From source file:PreferenceExample.java

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

    myPrefs.put("A", "a");
    myPrefs.put("B", "b");
    myPrefs.put("C", "c");

    System.out.print("Node's keys: ");
    for (String s : myPrefs.keys()) {
        System.out.print(s + "");
    }//from  w w w.  ja v  a2  s. co m
}

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From source file:PlanetPrefs.java

public static void main(String args[]) {
    String names[] = { "Mercury", "Venus", "Earth", "Mars", "Jupiter", "Saturn", "Uranus", "Neptune", "Pluto" };
    int moons[] = { 0, 0, 1, 2, 16, 18, 21, 8, 1 };

    Preferences prefs = Preferences.userRoot().node("/MasteringJava/Chap17");

    for (int i = 0, n = names.length; i < n; i++) {
        prefs.putInt(names[i], moons[i]);
    }/*w w  w.  j a  v a2 s. c  o  m*/

    try {
        String keys[] = prefs.keys();
        for (int i = 0, n = keys.length; i < n; i++) {
            System.out.println(keys[i] + ": " + prefs.getInt(keys[i], 0));
        }
    } catch (BackingStoreException e) {
        System.err.println("Unable to read backing store: " + e);
    }
}

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From source file:Main.java

public static void main(String[] args) throws Exception {
    Preferences prefs = Preferences.userNodeForPackage(Main.class);
    prefs.put("key1", "value1");
    prefs.put("key2", "value2");
    prefs.putInt("intValue", 4);
    prefs.putBoolean("booleanValue", true);
    int usageCount = prefs.getInt("intValue", 0);
    usageCount++;//from  w ww.  j  a  v  a2  s .  c  om
    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));
    }
    System.out.println(prefs.getInt("booleanValue", 0));
}

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From source file:MainClass.java

public static void main(String[] args) throws Exception {
    Preferences prefs = Preferences.userNodeForPackage(MainClass.class);
    prefs.put("key1", "value1");
    prefs.put("key2", "value2");
    prefs.putInt("intValue", 4);
    prefs.putBoolean("booleanValue", true);
    int usageCount = prefs.getInt("intValue", 0);
    usageCount++;// w w w  .  j a va2 s . c  om
    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));
    }
    System.out.println(prefs.getInt("booleanValue", 0));
}

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From source file:PreferencesDemo.java

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++;/*from w w w  .j a v  a 2s  .c o  m*/
    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));
}

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From source file:Main.java

public static String containsValue(Preferences node, String value) {
    try {/* w  ww.ja  v a2s  .c om*/
        String[] keys = node.keys();

        for (int i = 0; i < keys.length; i++) {
            if (value.equals(node.get(keys[i], null))) {
                return keys[i];
            }
        }
    } catch (BackingStoreException e) {
    }
    return null;
}

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From source file:org.apache.cayenne.modeler.ModelerPreferences.java

public static List<String> getLastProjFiles() {
    Preferences filesPrefs = getLastProjFilesPref();
    ArrayList<String> arrayLastProjFiles = new ArrayList<>();
    String[] keys = null;/* w  w w  . j  a  va2s .c o m*/
    try {
        keys = filesPrefs.keys();
    }

    catch (BackingStoreException e) {
        logObj.warn("Error reading preferences file.", e);
    }
    if (keys != null) {
        int len = keys.length;

        ArrayList<Integer> keysInteger = new ArrayList<>();
        for (int i = 0; i < len; i++) {
            keysInteger.add(new Integer(i));
        }
        Collections.sort(keysInteger);

        for (int i = 0; i < len; i++) {
            arrayLastProjFiles.add(filesPrefs.get(keysInteger.get(i).toString(), ""));
        }
    }
    return arrayLastProjFiles;
}

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From source file:org.apache.cayenne.modeler.preferences.ModelerPreferences.java

public static List<String> getLastProjFiles() {
    Preferences filesPrefs = getLastProjFilesPref();
    ArrayList<String> arrayLastProjFiles = new ArrayList<String>();
    String[] keys = null;/*w ww. j a  v a2s  . c o m*/
    try {
        keys = filesPrefs.keys();
    }

    catch (BackingStoreException e) {
        logObj.warn("Error reading preferences file.", e);
    }
    if (keys != null) {
        int len = keys.length;

        ArrayList<Integer> keysInteger = new ArrayList<Integer>();
        for (int i = 0; i < len; i++) {
            keysInteger.add(new Integer(i));
        }
        Collections.sort(keysInteger);

        for (int i = 0; i < len; i++) {
            arrayLastProjFiles.add(filesPrefs.get(keysInteger.get(i).toString(), ""));
        }
    }
    return arrayLastProjFiles;
}

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From source file:PrefsUtil.java

/**
 * Gets a Map from the preferences./*from   w ww  .  j  av  a 2s  .  co m*/
 */
public static Map getMap(Preferences preferences) {
    if (preferences == null) {
        throw new IllegalArgumentException("Preferences not set.");
    }

    Map map = new HashMap();

    try {
        String[] keys = preferences.keys();

        for (int index = 0; index < keys.length; index++) {
            map.put(keys[index], preferences.get(keys[index], null));
        }
    } catch (BackingStoreException bse) {
        bse.printStackTrace();
    }

    return map;
}

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