Example usage for java.util ArrayList iterator

List of usage examples for java.util ArrayList iterator

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Introduction

In this page you can find the example usage for java.util ArrayList iterator.

Prototype

public Iterator<E> iterator()

Source Link

Document

Returns an iterator over the elements in this list in proper sequence.

Usage

From source file:Main.java

public static void main(String[] args) {
    ArrayList aList = new ArrayList();
    aList.add("1");
    aList.add("2");
    aList.add("3");
    aList.add("4");
    aList.add("java2 s .com");
    System.out.println("ArrayList: ");
    System.out.println(aList);/*from w  w  w .j ava2  s.co m*/
    Iterator itr = aList.iterator();
    String strElement = "";
    while (itr.hasNext()) {
        strElement = (String) itr.next();
        if (strElement.equals("2")) {
            itr.remove();
            break;
        }
    }
    System.out.println("ArrayList after removal : ");
    System.out.println(aList);
}

From source file:Person.java

public static void main(String args[]) {
    ArrayList<Person> names = new ArrayList<Person>();
    names.add(new Person("E", "T"));
    names.add(new Person("A", "G"));
    names.add(new Person("B", "H"));
    names.add(new Person("C", "J"));

    Iterator iter1 = names.iterator();
    while (iter1.hasNext()) {
        System.out.println(iter1.next());
    }/*  www  . jav a  2s.c o m*/
    Collections.sort(names, new PersonComparator());
    Iterator iter2 = names.iterator();
    while (iter2.hasNext()) {
        System.out.println(iter2.next());
    }
}

From source file:Person.java

public static void main(String args[]) {
    ArrayList<Person> names = new ArrayList<Person>();
    names.add(new Person("E", "T"));
    names.add(new Person("A", "G"));
    names.add(new Person("B", "H"));
    names.add(new Person("C", "J"));

    Iterator iter1 = names.iterator();
    while (iter1.hasNext()) {
        System.out.println(iter1.next());
    }//  w  ww  .  ja va2 s  .  c om
    System.out.println("Before sorting");
    Collections.sort(names, new PersonComparator());
    Iterator iter2 = names.iterator();
    while (iter2.hasNext()) {
        System.out.println(iter2.next());
    }
}

From source file:Main.java

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

    list.add("A");
    list.add("B");
    list.add("C");
    list.add("C");
    list.add("C");
    list.add("C");
    list.add("C");
    list.add("C");

    for (Iterator<String> iter = list.iterator(); iter.hasNext();) {
        String s = iter.next();/*from w ww . j  a  v  a  2  s.com*/
        if (s.equals("B")) {
            iter.remove();
        } else {
            System.out.println(s);
        }
    }

    for (String s : list) {
        System.out.println(s);
    }
}

From source file:MainClass.java

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

    al.add("C");//ww  w . j a v  a 2 s  . c om
    al.add("A");
    al.add("E");
    al.add("B");
    al.add("D");
    al.add("F");

    System.out.print("Original contents of al: ");
    Iterator<String> itr = al.iterator();
    while (itr.hasNext()) {
        String element = itr.next();
        System.out.print(element + " ");
    }
    System.out.println();

    ListIterator<String> litr = al.listIterator();
    while (litr.hasNext()) {
        String element = litr.next();
        litr.set(element + "+");
    }

    // Now, display the list backwards.
    System.out.print("Modified list backwards: ");
    while (litr.hasPrevious()) {
        String element = litr.previous();
        System.out.print(element + " ");
    }
}

From source file:Main.java

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

    aList.add("1");
    aList.add("2");
    aList.add("3");
    aList.add("4");
    aList.add("5");

    for (String str : aList) {
        System.out.println(str);//from  w w w  .j av  a2 s  .  c  om
    }
    Iterator itr = aList.iterator();

    // remove 2 from ArrayList using Iterator's remove method.

    String strElement = "";

    while (itr.hasNext()) {
        strElement = (String) itr.next();
        if (strElement.equals("2")) {
            itr.remove();
            break;
        }
    }
    for (String str : aList) {
        System.out.println(str);
    }
}

From source file:com.mycompany.asyncreq.Main.java

public static void main(String[] args) throws JsonProcessingException, JSONException, IOException {

    Configuration config = new Configuration();
    // Name tables with lowercase_underscore_separated
    RestTemplate restTemplate = new RestTemplate();
    config.setNamingStrategy(new ImprovedNamingStrategy());
    try {//from  ww  w  . j a va  2 s.c  om

        ArrayList<String> ArrReq = GenData();
        String addr;
        for (Iterator<String> i = ArrReq.iterator(); i.hasNext();) {
            try {
                addr = i.next();
                Thread.sleep(1000);
                Root tRoot = restTemplate.getForObject(addr, Root.class);
                tRoot.addr = addr;
                if (!tRoot.dataset.isEmpty())
                    if (tRoot.dataset.size() == tRoot.validation.count.value)
                        ObjToCsv(tRoot, "all");

                    else {
                        for (int reg = 1; reg < 5; reg++) {
                            Thread.sleep(1000);
                            addr = "http://comtrade.un.org/api/get?max=50000&type=C&freq=M&px=HS&ps=2014&r=804&p="
                                    + tRoot.dataset.get(0).getptCode() + "&rg=" + reg + "&cc=All&fmt=json";
                            Root tRootImp = restTemplate.getForObject(addr, Root.class);
                            tRootImp.addr = addr;
                            if (!tRootImp.dataset.isEmpty())
                                if (tRootImp.dataset.size() == tRootImp.validation.count.value)
                                    ObjToCsv(tRootImp, Integer.toString(reg));
                                else
                                    System.out.println("addr:  " + tRootImp.addr + "\n");
                        }
                    }
                else
                    System.out.println("addr:  " + tRoot.addr + ":null" + "\n");
            } catch (Exception e) {
                System.err.println(e.getMessage());

            }
        }

    } catch (Exception e) {
        System.err.println("Got an exception! ");
        System.err.println(e.getMessage());
    }
}

From source file:Main.java

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

    list.add("Monday");
    list.add("Tuesdag");
    list.add("Wednesday");
    list.add("Thursday");
    list.add("Friday");
    list.add("Saturday");
    list.add("Sunday");

    Iterator<String> iterator = null;

    iterator = list.iterator();
    while (iterator.hasNext()) {
        String element = iterator.next();
        System.out.println(element);
    }/*from  w  w w.j a v a2  s  .co  m*/

    for (iterator = list.iterator(); iterator.hasNext();) {
        String element = iterator.next();
        System.out.println(element);
    }

    for (String element : list) {
        System.out.println(element);
    }
}

From source file:Main.java

public static void main(String[] args) {
    try {/* w ww .  j av  a  2s. c  o m*/
        BufferedReader input = new BufferedReader(new FileReader(args[0]));
        ArrayList list = new ArrayList();
        String line;
        while ((line = input.readLine()) != null) {
            list.add(line);
        }
        input.close();

        Collections.reverse(list);

        PrintWriter output = new PrintWriter(new BufferedWriter(new FileWriter(args[1])));
        for (Iterator i = list.iterator(); i.hasNext();) {
            output.println((String) i.next());
        }
        output.close();
    } catch (IOException e) {
        System.err.println(e);
    }
}

From source file:OldStyle.java

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

    // These lines store strings, but any type of object 
    // can be stored.  In old-style code, there is no  
    // convenient way restrict the type of objects stored 
    // in a collection 
    list.add("one");
    list.add("two");
    list.add("three");
    list.add("four");

    Iterator itr = list.iterator();
    while (itr.hasNext()) {

        // To retrieve an element, an explicit type cast is needed 
        // because the collection stores only Object. 
        String str = (String) itr.next(); // explicit cast needed here. 

        System.out.println(str + " is " + str.length() + " chars long.");
    }//from  ww  w  .ja  v  a  2 s .co m
}