[자료구조] Java Collection interface

java.util.Collection 인터페이스 

public interface Collection {
	public boolean add(Object object);

	public boolean addAll(Collection collection);

	public void clear();

	public boolean contains(Object object);

	public boolean containsAll(Collection collection);

	public boolean equals(Object object);

	public int hashCode();

	public boolean isEmpty();

	public Iterator iterator();

	public boolean remove(Object object);

	public boolean removeAll(Collection collection);

	public boolean retainAll(Collection collection);

	public int size();

	public Object[] toArray();

	public Object[] toArray(Object[] objects);
	
}

메소드	집합연산
x.addAll(y)	합집합
x.contains(y)	부분집합
x.removeAll(y)	상대 보수
x.retainAll(y)	교집합