set.java

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// Introduced in Chapter 11
/** A set of Objects. */
public interface Set<E> {

  /** Add target to this Set. */
  public void add(E target);

  /** Return true if this Set contains target. */
  public boolean contains(E target);

  /** Remove target from this Set. */
  public void remove(E target);

  /** Return the number of elements in this Set. */
  public int size();

}