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:Main.java

public static <T> Set<T> getSet() {
    return new HashSet<T>();
}

From source file:Main.java

/**
 * Thread safe method to initialize sets
 * @param initSet//from   w  ww  . j  a  va2s . com
 * @return an initialized set of the desired object type
 */
public static synchronized <T> Set<T> initializeSets(Set<T> initSet) {
    if (initSet == null) {
        return new HashSet<T>();
    } else {
        initSet.addAll(initSet);
        return initSet;
    }
}

From source file:Main.java

public static Set<String> getFavorities(Context c) {
    return c.getSharedPreferences(PREFS_NAME, 0).getStringSet(FAVORITIES, new HashSet<String>());
}

From source file:Main.java

/**
 * Many to One way of finding Keys from value
 * @param map/* www.  j a  v a 2  s.c o  m*/
 * @param value
 * @return keys
 */
public static <T, E> Set<T> getKeysByValue(Map<T, E> map, E value) {
    Set<T> keys = new HashSet<T>();
    for (Entry<T, E> entry : map.entrySet()) {
        if (value.equals(entry.getValue())) {
            keys.add(entry.getKey());
        }
    }
    return keys;
}

From source file:Main.java

public static <K, V> Map<K, Set<V>> groupByKeyEmpty(List<K> keys) {
    Map<K, Set<V>> map = new HashMap<K, Set<V>>();
    for (K key : keys) {
        if (!map.containsKey(key)) {
            map.put(key, new HashSet<V>());
        }/*from   ww  w. ja v a  2  s  . c o m*/
    }
    return map;
}

From source file:Main.java

/**
 * Returns true if every element in a collection are unique by {@link Object#equals(Object)}.
 *//* w w w  .j  a  v  a2s . c o m*/
public static boolean elementsAreUnique(Collection<?> items) {
    final Set<Object> testSet = new HashSet<>();
    for (Object item : items) {
        final boolean itemAlreadyExists = !testSet.add(item); // see Set documentation
        if (itemAlreadyExists) {
            return false;
        }
    }
    return true;
}

From source file:Main.java

private static Set<Integer> checkDuplicate(int[] intArray) {
    Set<Integer> duplicates = new HashSet<Integer>();
    Set<Integer> tmp = new HashSet<Integer>();
    for (Integer i : intArray) {
        if (!tmp.add(i)) {
            duplicates.add(i);/*from w  w w.j av a  2 s .c o m*/
        }
    }
    return duplicates;
}

From source file:Main.java

public static HashSet<String> getUserContacts(ContentResolver cr) {
    HashSet<String> contactsList = new HashSet<String>();
    //ContentResolver cr = getContentResolver();
    Cursor cur = cr.query(ContactsContract.Contacts.CONTENT_URI, null, null, null, null);
    if (cur.getCount() > 0) {
        while (cur.moveToNext()) {
            String id = cur.getString(cur.getColumnIndex(ContactsContract.Contacts._ID));
            // We could store names and numbers in a dictionary if we ever needed that
            // String name = cur.getString(cur.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
            if (Integer.parseInt(
                    cur.getString(cur.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER))) > 0) {
                Cursor pCur = cr.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null,
                        ContactsContract.CommonDataKinds.Phone.CONTACT_ID + " = ?", new String[] { id }, null);
                while (pCur.moveToNext()) {
                    String phoneNo = pCur
                            .getString(pCur.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
                    // If the number stored isn't long enough to be in our database then don't bother.
                    if (phoneNo.length() >= 10) {
                        // Use regex to remove '+', spaces, '(', and ')' and '-' form user contacts to match database format
                        String formattedPhoneNo = phoneNo.replaceAll(DELIMITERS, "");
                        // Remove the '1' in front of the number
                        if (formattedPhoneNo.charAt(0) == '1') {
                            formattedPhoneNo = formattedPhoneNo.substring(1);
                        }// www .  j  a v a 2s .  co  m
                        contactsList.add(formattedPhoneNo);
                    }
                }
                pCur.close();
            }
        }
    }
    return contactsList;
}

From source file:Main.java

public static <T> List<T> copyWithoutDublicates(List<T> l) {
    final List<T> result = new ArrayList<T>();
    final Set<T> set = new HashSet<T>();
    for (Iterator<T> it = l.iterator(); it.hasNext();) {
        final T t = it.next();
        if (set.add(t)) {
            result.add(t);//  w  ww. j a v a 2s  .  c  o  m
        }
    }
    return result;
}

From source file:Main.java

public static void removeDuplicateWithOrder(List<ResolveInfo> list) {

    if (list == null) {

        return;/* w  w w.  ja  v a  2s  .co m*/

    }

    Set<String> set = new HashSet<String>();

    List<ResolveInfo> newList = new ArrayList<ResolveInfo>();

    for (Iterator<ResolveInfo> iter = list.iterator(); iter.hasNext();) {

        ResolveInfo info = (ResolveInfo) iter.next();

        if (set.add(info.activityInfo.packageName)) {

            newList.add(info);

        }
    }

    list.clear();

    list.addAll(newList);

}