API for set operations in Java? [closed]

Answer 1

I don't know any API but have used following methods do such things on Set.

public static  Set union(Set setA, Set setB) {
    Set tmp = new TreeSet(setA);
    tmp.addAll(setB);
    return tmp;
  }

  public static  Set intersection(Set setA, Set setB) {
    Set tmp = new TreeSet();
    for (T x : setA)
      if (setB.contains(x))
        tmp.add(x);
    return tmp;
  }

  public static  Set difference(Set setA, Set setB) {
    Set tmp = new TreeSet(setA);
    tmp.removeAll(setB);
    return tmp;
  }

  public static  Set symDifference(Set setA, Set setB) {
    Set tmpA;
    Set tmpB;

    tmpA = union(setA, setB);
    tmpB = intersection(setA, setB);
    return difference(tmpA, tmpB);
  }

  public static  boolean isSubset(Set setA, Set setB) {
    return setB.containsAll(setA);
  }

  public static  boolean isSuperset(Set setA, Set setB) {
    return setA.containsAll(setB);
  }

Reference: Set operations: union, intersection, difference, symmetric difference, is subset, is superset