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The OpenTripPlanner multimodal journey planning system

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package org.opentripplanner.util.lang;

import java.util.Arrays;
import java.util.Collection;
import java.util.Set;
import java.util.stream.Collectors;

public class SetUtils {

  /**
   * Combine a number of collections into a single Set.
   */
  @SafeVarargs
  public static  Set combine(Collection... colls) {
    return Arrays.stream(colls).flatMap(Collection::stream).collect(Collectors.toSet());
  }
}