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(int initialCapacity)

Source Link

Document

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

Usage

From source file:Main.java

public static <T> Set<Set<T>> extractSubSets(Set<T> initialSet, int subSetSize) {
    int nbSources = initialSet.size();
    int expectedNumberOfSets = expectedNumberOfSets(nbSources, subSetSize);
    Set<Set<T>> setOfSets = new HashSet<>(expectedNumberOfSets);
    if (nbSources == subSetSize) {
        // Already OK
        setOfSets.add(initialSet);/* www . j a v a2  s. c  o  m*/
        return setOfSets;
    }
    List<T> setAsList = new ArrayList<>(initialSet);
    int[] iterators = new int[subSetSize];
    for (int i = 0; i < iterators.length; i++) {
        iterators[i] = i;
    }
    while (setOfSets.size() != expectedNumberOfSets) {
        HashSet<T> result = new HashSet<>(subSetSize);
        for (int pos : iterators) {
            result.add(setAsList.get(pos));
        }
        if (result.size() != subSetSize) {
            throw new IllegalStateException("Hard!");
        }
        setOfSets.add(result);
        int maxPos = -1;
        for (int i = 0; i < iterators.length; i++) {
            int pos = iterators[i];
            if (pos == (nbSources - iterators.length + i)) {
                maxPos = i;
                break;
            }
        }
        if (maxPos == -1) {
            // Up last iterator
            iterators[iterators.length - 1]++;
        } else if (maxPos == 0) {
            // Finished
            if (setOfSets.size() != expectedNumberOfSets) {
                System.err.println("Something wrong!");
            }
        } else {
            // Up the one before maxPos and reinit the others
            iterators[maxPos - 1]++;
            for (int i = maxPos; i < iterators.length; i++) {
                iterators[i] = iterators[i - 1] + 1;
            }
        }
    }
    return setOfSets;
}

From source file:Main.java

/** Shortcut for creating a Set collection. Used for the list of required and unbound parameters. */
public static <T2> Set<T2> unmodifiableSet(T2... items) {
    return Collections.unmodifiableSet(new HashSet<T2>(Arrays.asList(items)));
}

From source file:Main.java

public static <T> Set<T> copy(Set<? extends T> a) {
    return new HashSet<T>(a);
}

From source file:Main.java

public static Set<String> getLockedApps(Context c) {
    SharedPreferences sp = appsPrefs(c);
    return new HashSet<>(sp.getAll().keySet());
}

From source file:Main.java

/**
 * Returns the items as a populated set.
 *
 * @param items//from w  w  w. j av  a2  s. c om
 *            Object[]
 * @return Set
 */
public static <T> Set<T> asSet(T[] items) {

    return new HashSet<>(Arrays.asList(items));
}

From source file:Main.java

private static Map<String, Set<String>> convertHashMapToTypeSet(Map<String, String> hashMap) {
    Map<String, Set<String>> globalVars = new HashMap<String, Set<String>>();

    for (final Map.Entry<String, String> entry : hashMap.entrySet()) {
        globalVars.put(entry.getKey(), new HashSet<String>(Arrays.asList(entry.getValue())));
    }/*  w  w w.  j  a  v  a  2s .  com*/

    return globalVars;
}

From source file:Main.java

public static <T> Set<T> immutableSet(Collection<? extends T> set) {
    return Collections.unmodifiableSet(set instanceof Set ? (Set<? extends T>) set : new HashSet<T>(set));
}

From source file:Main.java

/**
 * Function to remove duplicate elements from the array of string
 * @param stringArray array of string having duplicate elements.
 * @return unique array of string /*from  w  w w . j  a v a2 s.  c o m*/
 */
public static String[] removeDuplicatesFrom(String[] stringArray) {
    Set<String> temp = new HashSet<String>(Arrays.asList(stringArray));
    String[] uniqueStringArray = temp.toArray(new String[temp.size()]);
    return uniqueStringArray;
}

From source file:Main.java

public static Set toSet(List someElements) {
    Set asSet = new HashSet(someElements.size());
    for (int i = 0; i < someElements.size(); i++)
        asSet.add(someElements.get(i));/*from w  ww . java  2  s .co m*/

    return asSet;
}

From source file:Main.java

@SafeVarargs
public static <T> Set<T> asSet(T... ts) {
    return new HashSet<>(Arrays.asList(ts));
}