Example usage for java.util HashSet HashSet

Introduction

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

Prototype

public HashSet()

Source Link

Document

Constructs a new, empty set; the backing HashMap instance has default initial capacity (16) and load factor (0.75).

Usage

From source file:HashSetExample.java

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

    set.add(new Integer(1));
    set.add(new Integer(2));
    set.add(new Integer(3));
    set.add(new Integer(4));
    set.add(new Integer(5));
    set.add(new Integer(6));
    set.add(new Integer(7));
    set.add(new Integer(8));
    set.add(new Integer(9));
    set.add(new Integer(10));

    // Use iterator to display the vsetes
    System.out.println("HashSet Before: ");
    for (Iterator i = set.iterator(); i.hasNext();) {
        Integer integer = (Integer) i.next();
        System.out.println(integer);
    }//w  w w . j a v a 2s.c o  m

    // Remove the integer 6
    System.out.println("\nRemove integer 6");
    set.remove(new Integer(6));

    // Use iterator to display the vsetes
    System.out.println("\nHashSet After: ");
    for (Iterator i = set.iterator(); i.hasNext();) {
        Integer integer = (Integer) i.next();
        System.out.println(integer);
    }

}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    Set<AWTKeyStroke> set = new HashSet<AWTKeyStroke>();

    KeyboardFocusManager.getCurrentKeyboardFocusManager()
            .setDefaultFocusTraversalKeys(KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, set);
}

From source file:Main.java

public static void main(String[] args) {
    Set<Object> result = new HashSet<Object>();
    Provider[] providers = Security.getProviders();
    for (Provider provider : providers) {
        Set<Object> keys = provider.keySet();
        for (Object key : keys) {
            String data = (String) key;
            data = data.split(" ")[0];
            if (data.startsWith("Alg.Alias")) {
                data = data.substring(10);
            }//  w ww  .  j a  v a  2s .  c o m
            data = data.substring(0, data.indexOf('.'));
            result.add(data);
        }
    }
    for (Object o : result) {
        System.out.println("Service Type = " + o);
    }
}

From source file:Main.java

public static void main(String[] args) {
    Set<Object> set = new HashSet<Object>();
    set.add("A");
    set.add(new Long(10));
    set.add(new Date());

    List<Object> list = new ArrayList<Object>(set);
    Object[] objects = list.toArray();

    for (int i = 0; i < objects.length; i++) {
        Object object = objects[i];
        System.out.println("Object = " + object);
    }//from  w ww  .j av a 2 s .  co m
}

From source file:Main.java

public static void main(String[] argv) throws Exception {
    Set<AWTKeyStroke> set = new HashSet<AWTKeyStroke>();

    KeyboardFocusManager.getCurrentKeyboardFocusManager()
            .setDefaultFocusTraversalKeys(KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS, set);

}

From source file:Main.java

public static void main(final String[] args) throws Exception {
    Random random = new Random();
    Set<Integer> intSet = new HashSet<>();
    while (intSet.size() < 6) {
        intSet.add(random.nextInt(49) + 1);
    }/* w w w. j  a v  a2 s .c om*/
    Integer[] ints = intSet.toArray(new Integer[intSet.size()]);
    System.out.println(Arrays.toString(ints));
}

From source file:Main.java

public static void main(String[] args) {
    Random random = new Random();
    Set<Integer> set = new HashSet<Integer>();
    while (set.size() < 5) {
        set.add(random.nextInt());//from ww  w .  j a v a 2  s.c o  m
    }
    List<Integer> result = new ArrayList<Integer>(set);
    System.out.println(result);
}

From source file:Main.java

  public static void main(String[] argv) throws Exception {
  Set result = new HashSet();
  String serviceType = "KeyFactory";
  Provider[] providers = Security.getProviders();
  for (int i = 0; i < providers.length; i++) {
    Set keys = providers[i].keySet();
    for (Iterator it = keys.iterator(); it.hasNext();) {
      String key = (String) it.next();
      key = key.split(" ")[0];

      if (key.startsWith(serviceType + ".")) {
        result.add(key.substring(serviceType.length() + 1));
      } else if (key.startsWith("Alg.Alias." + serviceType + ".")) {
        result.add(key.substring(serviceType.length() + 11));
      }/* w  w  w.  java2s.  c  o  m*/
    }
  }
  System.out.println(result);
}

From source file:ItemSet.java

public static void main(String args[]) {
    String names[] = { "Item 1", "Item 2", "Item 3" };
    Set moons = new HashSet();
    int namesLen = names.length;
    int index;//from w w  w. ja va 2 s  .c  o m
    for (int i = 0; i < 100; i++) {
        index = (int) (Math.random() * namesLen);
        moons.add(names[index]);
    }
    Iterator it = moons.iterator();
    while (it.hasNext()) {
        System.out.println(it.next());
    }
    System.out.println("---");
    Set orderedMoons = new TreeSet(moons);
    it = orderedMoons.iterator();
    while (it.hasNext()) {
        System.out.println(it.next());
    }
}

From source file:Main.java

public static void main(String[] arg) throws Exception {
    Runnable parallelCode = () -> {
        HashSet<String> allThreads = new HashSet<>();
        IntStream.range(0, 1_000_000).parallel().filter(i -> {
            allThreads.add(Thread.currentThread().getName());
            return false;
        }).min();// w w  w  .j  ava  2 s .com
        System.out.println("executed by " + allThreads);
    };
    System.out.println("default behavior: ");
    parallelCode.run();
    System.out.println("specialized pool:");
    ForkJoinPool pool = new ForkJoinPool(2);
    pool.submit(parallelCode).get();
}