Example usage for java.util Iterator next

Introduction

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

Prototype

E next();

Source Link

Document

Returns the next element in the iteration.

Usage

From source file:Main.java

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

    arrlist.add(1);//from   w w  w  . ja va  2s  .  c  om
    arrlist.add(2);
    arrlist.add(3);
    arrlist.add(4);
    arrlist.add(5);

    Iterator<Integer> iterator = arrlist.iterator();
    while (iterator.hasNext()) {
        Integer i = iterator.next();
        System.out.println(i);
    }

}

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 .  jav a  2s  .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[] 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 www . ja  v a2 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));
    }
    System.out.println(prefs.getInt("booleanValue", 0));
}

From source file:SafeCollectionIteration.java

public static void main(String[] args) {
    List wordList = Collections.synchronizedList(new ArrayList());

    wordList.add("Iterators");
    wordList.add("require");
    wordList.add("special");
    wordList.add("handling");

    synchronized (wordList) {
        Iterator iter = wordList.iterator();
        while (iter.hasNext()) {
            String s = (String) iter.next();
            System.out.println("found string: " + s + ", length=" + s.length());
        }//from w  w w.j  a v a 2  s . c  om
    }
}

From source file:Main.java

public static void main(String[] args) {
    Hashtable<String, String> ht = new Hashtable<String, String>();

    ht.put("1", "One");
    ht.put("2", "Two");
    ht.put("3", "Three");

    Set st = ht.keySet();/*ww  w.j av a  2 s. c om*/

    Iterator itr = st.iterator();

    while (itr.hasNext()) {
        System.out.println(itr.next());
    }
    st.remove("2");

    Enumeration e = ht.keys();
    while (e.hasMoreElements()) {
        System.out.println(e.nextElement());
    }
}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    Object keyObject = "";
    Object valueObject = "";
    Map<Object, Object> weakMap = new WeakHashMap<Object, Object>();

    weakMap.put(keyObject, valueObject);
    WeakReference weakValue = new WeakReference<Object>(valueObject);

    weakMap.put(keyObject, weakValue);/*from www. j a v  a  2s. c  om*/

    Iterator it = weakMap.keySet().iterator();
    while (it.hasNext()) {
        Object key = it.next();
        weakValue = (WeakReference) weakMap.get(key);
        if (weakValue == null) {
            System.out.println("Value has been garbage-collected");
        } else {
            System.out.println("Get value");
            valueObject = weakValue.get();
        }
    }
}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    Map<String, Integer> map = new HashMap<String, Integer>();
    map = new TreeMap();

    map.put("a", new Integer(1));
    map.put("b", new Integer(2));
    map.put("c", new Integer(3));

    int size = map.size(); // 2

    Object oldValue = map.put("a", new Integer(9)); // 1

    oldValue = map.remove("c"); // 3

    Iterator it = map.keySet().iterator();
    while (it.hasNext()) {
        Object key = it.next();
    }//  w  w w  . j  a v a 2  s .  c om

    it = map.values().iterator();
    while (it.hasNext()) {
        Object value = it.next();
    }
}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    Object keyObject = "";
    Object valueObject = "";
    Map weakMap = new WeakHashMap();

    weakMap.put(keyObject, valueObject);
    WeakReference weakValue = new WeakReference(valueObject);

    weakMap.put(keyObject, weakValue);/*w  w  w .j av a2  s.c  o  m*/

    Iterator it = weakMap.keySet().iterator();
    while (it.hasNext()) {
        Object key = it.next();
        weakValue = (WeakReference) weakMap.get(key);
        if (weakValue == null) {
            System.out.println("Value has been garbage-collected");
        } else {
            System.out.println("Get value");
            valueObject = weakValue.get();
        }
    }
}

From source file:Main.java

public static void main(String[] args) {

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

    treeadd.add(12);//from   w  w w . ja va 2 s .c  om
    treeadd.add(13);
    treeadd.add(14);
    treeadd.add(15);

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

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

From source file:Main.java

public static void main(String[] args) {

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

    treeadd.add(1);/*from   ww w.  j  a v  a 2 s.co m*/
    treeadd.add(13);
    treeadd.add(17);
    treeadd.add(22);

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

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