Example usage for java.util.concurrent CopyOnWriteArraySet addAll

Introduction

In this page you can find the example usage for java.util.concurrent CopyOnWriteArraySet addAll.

Prototype

public boolean addAll(Collection<? extends E> c) 

Source Link

Document

Adds all of the elements in the specified collection to this set if they're not already present.

Usage

From source file:Main.java

/**
 * This method, as the name suggests, will take the union of all the input sets,
 * creating an output, thread-safe set./*  w w  w  .j a  va 2  s . c o  m*/
 * @param collections    input sets
 * @param <E>     type of set items
 * @return a set that is the union of all input sets
 */
public static <E> Set<E> union(Collection<E>... collections) {
    final CopyOnWriteArraySet<E> result = new CopyOnWriteArraySet<E>();
    for (Collection<E> collection : collections) {
        result.addAll(collection);
    }
    return result;
}

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