Example usage for java.util Iterator hasNext

Introduction

In this page you can find the example usage for java.util Iterator hasNext.

Prototype

boolean hasNext();

Source Link

Document

Returns true if the iteration has more elements.

Usage

From source file:Main.java

public static void main(String[] args) {
    TreeSet<Integer> tree = new TreeSet<Integer>();

    tree.add(12);/*from   www. j a  v a 2 s .co  m*/
    tree.add(13);
    tree.add(14);
    tree.add(15);
    tree.add(16);
    tree.add(17);

    // getting values less than 15
    TreeSet<Integer> treeheadset = (TreeSet) tree.headSet(15);

    Iterator<Integer> iterator = treeheadset.iterator();

    while (iterator.hasNext()) {
        System.out.println(iterator.next());
    }
}

From source file:SetDemo.java

public static void main(String[] argv) {
    //+/*ww w.  jav a 2  s . c o  m*/
    Set h = new HashSet();
    h.add("One");
    h.add("Two");
    h.add("One"); // DUPLICATE
    h.add("Three");
    Iterator it = h.iterator();
    while (it.hasNext()) {
        System.out.println(it.next());
    }
    //-
}

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++;/*w w  w  .j  a  v a 2 s  . 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));
}

From source file:MovingPlanets.java

public static void main(String args[]) {
    String names[] = { "Mercury", "Venus", "Earth", "Mars", "Jupiter", "Saturn", "Uranus", "Neptune", "Pluto" };
    List planets = new ArrayList();
    for (int i = 0, n = names.length; i < n; i++) {
        planets.add(names[i]);//from   w  w  w . j a  v  a2s  .  co  m
    }
    ListIterator lit = planets.listIterator();
    String s;
    lit.next();
    lit.next();
    s = (String) lit.next();
    lit.remove();
    lit.next();
    lit.next();
    lit.next();
    lit.add(s);
    lit.next(); // Gets back just added
    lit.previous();
    lit.previous();
    s = (String) lit.previous();
    lit.remove();
    lit.next();
    lit.next();
    lit.add(s);
    Iterator it = planets.iterator();
    while (it.hasNext()) {
        System.out.println(it.next());
    }
}

From source file:Main.java

public static void main(String[] args) {

    TreeSet<Integer> treeone = new TreeSet<Integer>();
    TreeSet<Integer> treetwo = new TreeSet<Integer>();

    treeone.add(12);//ww w.j  a va  2 s . com
    treeone.add(13);
    treeone.add(14);

    treetwo.add(15);
    treetwo.add(16);
    treetwo.add(17);

    // adding treetwo to treeone
    treeone.addAll(treetwo);

    Iterator<Integer> iterator = treeone.iterator();

    while (iterator.hasNext()) {
        System.out.print(iterator.next());
    }
}

From source file:SyncTest.java

public static void main(String args[]) {
    Set simpsons = new HashSet();
    simpsons.add("Bart");
    simpsons.add("Hugo");
    simpsons.add("Lisa");
    simpsons.add("Marge");
    simpsons.add("Homer");
    simpsons.add("Maggie");
    simpsons.add("Roy");
    simpsons = Collections.synchronizedSet(simpsons);
    synchronized (simpsons) {
        Iterator iter = simpsons.iterator();
        while (iter.hasNext()) {
            System.out.println(iter.next());
        }//  w  w w.j  av  a  2s  .c  o m
    }
    Map map = Collections.synchronizedMap(new HashMap(89));
    Set set = map.entrySet();
    synchronized (map) {
        Iterator iter = set.iterator();
        while (iter.hasNext()) {
            System.out.println(iter.next());
        }
    }
}

From source file:Main.java

public static void main(String[] args) {

    TreeSet<Integer> treeadd = new TreeSet<Integer>();

    treeadd.add(1);/* w w w .j  a  v  a 2  s .  c om*/
    treeadd.add(2);
    treeadd.add(3);
    treeadd.add(4);
    treeadd.add(5);
    treeadd.add(6);
    treeadd.add(7);
    treeadd.add(8);

    TreeSet<Integer> treesubset = (TreeSet<Integer>) treeadd.subSet(3, 7);

    Iterator<Integer> iterator = treesubset.iterator();

    while (iterator.hasNext()) {
        System.out.println(iterator.next());
    }
}

From source file:Main.java

public static void main(String[] args) {

    TreeSet<Integer> treeadd = new TreeSet<Integer>();

    treeadd.add(1);/*ww  w . ja  v a2 s  . c  o  m*/
    treeadd.add(2);
    treeadd.add(3);
    treeadd.add(4);
    treeadd.add(5);
    treeadd.add(6);
    treeadd.add(7);
    treeadd.add(8);

    TreeSet<Integer> treesubset = (TreeSet<Integer>) treeadd.subSet(3, true, 7, true);

    Iterator<Integer> iterator = treesubset.iterator();

    while (iterator.hasNext()) {
        System.out.println(iterator.next());
    }
}

From source file:Main.java

public static void main(String args[]) {
    HashSet<String> newset = new HashSet<String>();

    // populate hash set
    newset.add("Learning");
    newset.add("from");
    newset.add("java2s.com");

    // create an iterator
    Iterator iterator = newset.iterator();

    // check values
    while (iterator.hasNext()) {
        System.out.println("Value: " + iterator.next() + " ");
    }//from  w  ww  .  j a  v a2 s .co  m
}

From source file:Main.java

public static void main(String[] args) {

    TreeSet<Integer> treeadd = new TreeSet<Integer>();

    treeadd.add(1);//w ww. j a  va  2 s  .  c  o m
    treeadd.add(2);
    treeadd.add(3);
    treeadd.add(4);
    treeadd.add(5);
    treeadd.add(6);
    treeadd.add(7);
    treeadd.add(8);

    TreeSet<Integer> treetailset = (TreeSet<Integer>) treeadd.tailSet(4);

    Iterator<Integer> iterator = treetailset.iterator();

    while (iterator.hasNext()) {
        System.out.println(iterator.next());
    }
}