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:OldStyle.java

public static void main(String args[]) {
    ArrayList list = new ArrayList();

    list.add("one");
    list.add("two");
    list.add("three");
    list.add("four");

    Iterator itr = list.iterator();
    while (itr.hasNext()) {
        String str = (String) itr.next(); // explicit cast needed here.

        System.out.println(str + " is " + str.length() + " chars long.");
    }//from   w ww.j  av a2s  .co  m
}

From source file:Main.java

public static void main(String[] args) {
    Map map = System.getenv();

    Set keys = map.keySet();/*from   w w  w. ja v a  2  s .  com*/
    Iterator iterator = keys.iterator();
    while (iterator.hasNext()) {
        String key = (String) iterator.next();
        String value = (String) map.get(key);

        System.out.println(key + " = " + value);
    }
}

From source file:Main.java

public static void main(String[] a) {
    Map<String, String> map = new HashMap<String, String>();
    map.put("key1", "value1");
    map.put("key2", "value2");
    map.put("key3", "value3");
    Set set = map.entrySet();//from  w  w  w  .j a  v a  2s. c o m

    Iterator iter = set.iterator();

    while (iter.hasNext()) {
        Map.Entry entry = (Map.Entry) iter.next();

    }
}

From source file:Main.java

public static void main(String[] a) {
    Map<String, String> map = new HashMap<String, String>();
    map.put("key1", "value1");
    map.put("key2", "value2");
    map.put("key3", "value3");
    Set set = map.entrySet();/*from   w ww.  j  a va  2  s .c  om*/

    Iterator iter = set.iterator();

    while (iter.hasNext()) {
        Map.Entry entry = (Map.Entry) iter.next();
        System.out.println(entry.getKey() + " -- " + entry.getValue());
    }
}

From source file:Main.java

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

    lhashSet.add(new Integer("1"));
    lhashSet.add(new Integer("2"));
    lhashSet.add(new Integer("3"));

    Iterator itr = lhashSet.iterator();

    while (itr.hasNext()) {
        System.out.println(itr.next());
    }/*  w  w  w . java2s  .  c o  m*/
}

From source file:Main.java

public static void main(String[] args) {
    ArrayList<String> arrayList = new ArrayList<String>();
    arrayList.add("1");
    arrayList.add("2");
    arrayList.add("3");
    arrayList.add("4");
    arrayList.add("5");

    Iterator itr = arrayList.iterator();
    while (itr.hasNext()) {
        System.out.println(itr.next());
    }/* w  w w  .j  a v  a 2 s. c  o m*/
}

From source file:MainClass.java

public static void main(String[] a) {

    Map map = new HashMap();
    map.put("key1", "value1");
    map.put("key2", "value2");
    map.put("key3", "value3");
    Set set = map.entrySet();/*from w  ww .j  a v  a2s  .c o  m*/

    Iterator iter = set.iterator();

    while (iter.hasNext()) {
        Map.Entry entry = (Map.Entry) iter.next();
        System.out.println(entry.getKey() + " -- " + entry.getValue());
    }
}

From source file:MainClass.java

public static void main(String[] a) {
    Map map = new HashMap();
    map.put("key1", "value1");
    map.put("key2", "value2");
    map.put("key3", "value3");
    map.put(null, null);/*from  w  w w.  j  a  v a  2  s. c o m*/

    Set set = map.keySet();

    Iterator iter = set.iterator();

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

From source file:Main.java

public static void main(String[] argv) throws Exception {
    int capacity = 10;
    BlockingQueue<Integer> queue = new ArrayBlockingQueue<Integer>(capacity);

    for (int i = 0; i < 10; i++) {
        queue.add(i);//from  ww w  .j a v a2 s .c o  m
    }
    Iterator<Integer> it = queue.iterator();
    while (it.hasNext()) {
        System.out.println(it.next());
    }
}

From source file:Main.java

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

    Iterator it = weakMap.keySet().iterator();
    while (it.hasNext()) {
        Object key = it.next();//from   ww w . j av a 2  s .c o  m
    }
}