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 Collection<? extends Object> getIntersection(Collection<? extends Object> list1,
        Collection<? extends Object> list2) {
    HashSet<?> hashSet = new HashSet<Object>(list1);
    Collection<?> intersection = hashSet;
    intersection.retainAll(list2);/*  www.ja v a  2s  .co m*/
    return intersection;
}

From source file:Main.java

/**
 * Returns the intersection of the given Collections.
 *
 * @param c1  the first Collection./*w ww  .  ja  v  a  2s .c o m*/
 * @param c2  the second Collection.
 * @param <T> the type.
 * @return the intersection of the Collections.
 */
public static <T> Collection<T> intersection(Collection<T> c1, Collection<T> c2) {
    Set<T> set1 = new HashSet<>(c1);
    set1.retainAll(new HashSet<>(c2));
    return set1;
}

From source file:Main.java

public static <K> HashSet<K> createHashSet(int size) {
    return new HashSet<K>(size);
}

From source file:Main.java

/**
 * Converts parameters into a set/*from www . ja va  2 s .c o  m*/
 *
 * @param <T>   set element type
 * @param value element
 * @return set containing the given elements
 */
public static <T> Set<T> asSet(T value) {
    Set<T> set = new HashSet<>(1);
    set.add(value);
    return set;
}

From source file:Main.java

final static public Set<Object> createSet(final Set<?> set) {
    return new HashSet<Object>(set);
}

From source file:Main.java

/**
 * @param map map/*  ww w. ja  va2s . co  m*/
 * @return map deep copy
 */
public static Map<String, Set<String>> cloneMap(Map<String, Set<String>> map) {
    final Map<String, Set<String>> clone = new HashMap<>(map.size());
    for (Map.Entry<String, Set<String>> entry : map.entrySet()) {
        final Set<String> cloneSet = new HashSet<>(entry.getValue());
        clone.put(entry.getKey(), cloneSet);
    }

    return clone;
}

From source file:Main.java

/**
 * Returns of set of the objects given in the vararg.
 *
 * @param contents the objects to return in the set.
 * @param <T> the class the given objects are instantiations of.
 * @return a set containing the given contents.
 * @throws AssertionError if any of the contents are not the same type.
 *///from w w w.  java2s  .  co m
public static <T> Set<T> setOf(T... contents) {
    return new HashSet<T>(listOf(contents));
}

From source file:Main.java

public static <A> Set<A> makeSet(Collection<A> xs) {
    if (xs.size() == 0)
        return Collections.<A>emptySet();
    else if (xs.size() == 1)
        return Collections.singleton(xs.iterator().next());
    else {//  www .j a  v  a  2  s  . co m
        Set<A> set = new HashSet<A>(xs.size());
        set.addAll(xs);
        return set;
    }
}

From source file:Main.java

/**
 *
 *
 * Create a set out of arguments. This is as close to an object literal as you can get in Java and very similar to
 * the scala Set()/*from  www .j a  v a  2 s .com*/
 *
 * @param args items to put in a set
 * @param <T> type of set
 * @return set of items passed as arguments
 */
public static <T> Set<T> set(T... args) {
    return new HashSet<T>(Arrays.asList(args));
}

From source file:Main.java

public static <T> HashSet<T> newHashSet(int size) {
    return new HashSet<T>(getInitialCapacityFromExpectedSize(size));
}