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 <K, E> Set<E> getSetInitIfEmpty(Map<K, Set<E>> map, K key) {
    Set<E> value = map.get(key);
    if (value == null) {
        value = new HashSet<E>();
        map.put(key, value);/*from w  w w.j a  v  a  2 s  . com*/
    }
    return value;
}

From source file:Main.java

public static <T> Set<T> intersect(Collection<T> set1, Collection<T> set2) {
    HashSet<T> set = new HashSet<T>();

    for (T object : set1) {
        if (set2.contains(object)) {
            set.add(object);/*from  w  w  w.  j a v a  2  s .  c  o m*/
        }
    }

    return set;
}

From source file:Main.java

public static <T> Set<T> union(Collection<T> set1, Collection<T> set2) {
    HashSet<T> set = new HashSet<T>();

    for (T object : set1) {
        set.add(object);/*from   w  ww . j ava 2  s .com*/
    }
    for (T object : set2) {
        if (!set.contains(object)) {
            set.add(object);
        }
    }

    return set;
}

From source file:Main.java

public static Set<String> getAvailableIds() {
    Set<String> ids = new HashSet<>();
    ids.add(POOL1_NAME);//from w  w  w.  ja  v  a 2 s. com
    ids.add(POOL2_NAME);
    return ids;
}

From source file:Main.java

public static <T> Set<T> newSet(T... values) {
    Set<T> set = new HashSet<T>();
    for (T value : values) {
        set.add(value);/*from  w  ww  .j  a v  a  2  s.c  om*/
    }
    return set;
}

From source file:Main.java

public static <T> Set<T> union(Collection<? extends T> c1, Collection<? extends T> c2) {
    Set<T> result = new HashSet<T>();
    result.addAll(c1);/* w ww.  j a va2s  . c o m*/
    result.addAll(c2);
    return result;
}

From source file:Main.java

@SafeVarargs
public static <V> Set<V> unmodifiableSet(V... elements) {
    return Collections.unmodifiableSet(toSet(new HashSet<V>(), elements));
}

From source file:Main.java

/**
 * <p>/*w w  w. j a  v  a 2  s  .  com*/
 *    Creates an empty Set of Long types.
 * </p>
 * 
 * @return Set of Long types
 */
public static Set<Long> CreateEmptyLongSet() {
    return ((Set<Long>) (new HashSet<Long>()));
}

From source file:Main.java

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

From source file:Main.java

/**
 * Create new {@link HashSet}./* ww w .  j  ava 2  s  .  c  o m*/
 *
 * @param <K> key
 * @return {@link HashSet}
 */
public static <K> Set<K> newHashSet() {
    return new HashSet<K>();
}