Set operations : Set « Collections Data Structure « Java

Set operations


import java.util.LinkedHashSet;
import java.util.Set;

 * Note: This code is based on -<br>
 * Using LinkedHashSet, even though slightly slower than HashSet, in order to
 * ensure order is always respected (i.e. if called with TreeSet or
 * LinkedHashSet implementations).
 * @author Ravi Mohan
 * @author Ciaran O'Reilly
public class SetOps {

   * @param <T>
   * @param s1
   * @param s2
   * @return the union of s1 and s2. (The union of two sets is the set
   *         containing all of the elements contained in either set.)
  public static <T> Set<T> union(Set<T> s1, Set<T> s2) {
    Set<T> union = new LinkedHashSet<T>(s1);
    return union;

   * @param <T>
   * @param s1
   * @param s2
   * @return the intersection of s1 and s2. (The intersection of two sets is
   *         the set containing only the elements common to both sets.)
  public static <T> Set<T> intersection(Set<T> s1, Set<T> s2) {
    Set<T> intersection = new LinkedHashSet<T>(s1);
    return intersection;

   * @param <T>
   * @param s1
   * @param s2
   * @return the (asymmetric) set difference of s1 and s2. (For example, the
   *         set difference of s1 minus s2 is the set containing all of the
   *         elements found in s1 but not in s2.)
  public static <T> Set<T> difference(Set<T> s1, Set<T> s2) {
    Set<T> difference = new LinkedHashSet<T>(s1);
    return difference;


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