Example usage for java.util.prefs Preferences userNodeForPackage

Introduction

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

Prototype

public static Preferences userNodeForPackage(Class<?> c) 

Source Link

Document

Returns the preference node from the calling user's preference tree that is associated (by convention) with the specified class's package.

Usage

From source file:Main.java

public static void main(String[] argv) throws Exception {

    Preferences prefs = Preferences.userNodeForPackage(java.lang.String.class);

    Preferences node = prefs.parent(); // /java
    node = node.parent(); // null

    String[] names = null;//from w ww .  jav  a 2  s.c  o m
    names = prefs.childrenNames();

    for (int i = 0; i < names.length; i++) {
        node = prefs.node(names[i]);
    }
}

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From source file:Main.java

public static void main(String[] argv) throws Exception {
    Preferences prefs = Preferences.userNodeForPackage(Main.class);

    // Preference key name
    final String PREF_NAME = "name_of_preference";

    // Save//from  w w w .  j  a  v a  2 s .com
    prefs.put(PREF_NAME, "a string"); // String
    prefs.putBoolean(PREF_NAME, true); // boolean
    prefs.putInt(PREF_NAME, 123); // int
    prefs.putLong(PREF_NAME, 123L); // long
    prefs.putFloat(PREF_NAME, 12.3F); // float
    prefs.putDouble(PREF_NAME, 12.3); // double
    byte[] bytes = new byte[1024];
    prefs.putByteArray(PREF_NAME, bytes); // byte[]

    // Retrieve
    String s = prefs.get(PREF_NAME, "a string"); // String
    boolean b = prefs.getBoolean(PREF_NAME, true); // boolean
    int i = prefs.getInt(PREF_NAME, 123); // int
    long l = prefs.getLong(PREF_NAME, 123L); // long
    float f = prefs.getFloat(PREF_NAME, 12.3F); // float
    double d = prefs.getDouble(PREF_NAME, 12.3); // double
    bytes = prefs.getByteArray(PREF_NAME, bytes); // byte[]
}

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From source file:Main.java

public static void main(String[] argv) throws Exception {
    Preferences prefs = Preferences.userNodeForPackage(String.class);

    // Save some values
    prefs.put("myString", "a string"); // String
    prefs.putBoolean("myBoolean", true); // boolean
    prefs.putInt("myInt", 123); // int
    prefs.putLong("myLong", 123L); // long
    prefs.putFloat("myFloat", 12.3F); // float
    prefs.putDouble("myDouble", 12.3); // double
    byte[] bytes = new byte[10];
    prefs.putByteArray("myByteArray", bytes); // byte[]

    // Export the node to a file
    prefs.exportNode(new FileOutputStream("output.xml"));

}

---

From source file:Main.java

public static void main(String[] argv) throws Exception {
    Preferences prefs = Preferences.userNodeForPackage(String.class);

    // Save some values
    prefs.put("myString", "a string"); // String
    prefs.putBoolean("myBoolean", true); // boolean
    prefs.putInt("myInt", 123); // int
    prefs.putLong("myLong", 123L); // long

    // Save some values in the parent node
    prefs = prefs.parent();//w w w  .  j  a v  a2s. c  o  m
    prefs.putFloat("myFloat", 12.3F); // float
    prefs.putDouble("myDouble", 12.3); // double
    byte[] bytes = new byte[10];
    prefs.putByteArray("myByteArray", bytes); // byte[]

    prefs.exportSubtree(new FileOutputStream("output.xml"));
}

---

From source file:Main.java

public static void main(String[] argv) throws Exception {
    // Get the user preference node for java.lang
    Preferences prefs = Preferences.userNodeForPackage(String.class);

    // Remove a preference in the node
    final String PREF_NAME = "name_of_preference";
    prefs.remove(PREF_NAME);/*from  www.  j  a va 2 s. c o  m*/

    // Remove all preferences in the node

    prefs.clear();

}

---

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  w w.ja v  a 2s  .  co 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));
    }
    System.out.println(prefs.getInt("booleanValue", 0));
}

---

From source file:MainClass.java

public static void main(String[] args) {

    // Setup the Preferences for this application, by class.
    Preferences prefs = Preferences.userNodeForPackage(MainClass.class);

    // Retrieve some preferences previously stored, with defaults in case
    // this is the first run.
    String text = prefs.get("A", "a");
    String display = prefs.get("B", "b");
    System.out.println(text);// w  w w  . ja  va2 s .c o  m
    System.out.println(display);

    // Assume the user chose new preference values: Store them back.
    prefs.put("A", "aa");
    prefs.put("B", "bb");
}

---

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++;//from  www .j  a  v  a  2 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));
}

---

From source file:Main.java

public static void main(String[] argv) throws Exception {
    Preferences prefs = Preferences.userNodeForPackage(String.class);

    prefs.addNodeChangeListener(new NodeChangeListener() {
        public void childAdded(NodeChangeEvent evt) {
            Preferences parent = evt.getParent();
            Preferences child = evt.getChild();
        }/*from w  w  w  .j  ava2 s .c  o  m*/

        public void childRemoved(NodeChangeEvent evt) {
            Preferences parent = evt.getParent();
            Preferences child = evt.getChild();
        }
    });
    Preferences child = prefs.node("new node");
    child.removeNode();
    prefs.removeNode();
}

---

From source file:Main.java

public static void main(String[] argv) throws Exception {

    Preferences prefs = Preferences.userNodeForPackage(String.class);

    prefs.addPreferenceChangeListener(new PreferenceChangeListener() {
        public void preferenceChange(PreferenceChangeEvent evt) {

            Preferences node = evt.getNode();
            String key = evt.getKey();
            String newValue = evt.getNewValue();
        }/* w  ww. ja v  a  2 s. c om*/
    });
    prefs.put("key", "a string");
    prefs.put("key", "a new string");
    prefs.remove("key");
}

---

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