Class Collections

lib/java/util/Collections.java:30–3639

Collections contains static methods which operate on Collection classes. @since 1.2

 * @since 1.2
 */
public class Collections {

    private static final class CopiesList<E> extends AbstractList<E> implements
            Serializable {
        private static final long serialVersionUID = 2739099268398711800L;

        private final int n;

        private final E element;

        CopiesList(int length, E object) {
            if (length < 0) {
                throw new IllegalArgumentException();
            }
            n = length;
            element = object;
        }

        @Override
        public boolean contains(Object object) {
            return element == null ? object == null : element.equals(object);
        }

        @Override
        public int size() {
            return n;
        }

        @Override
        public E get(int location) {
            if (0 <= location && location < n) {
                return element;
            }
            throw new IndexOutOfBoundsException();
        }
    }

    @SuppressWarnings("unchecked")
    private static final class EmptyList extends AbstractList implements
            RandomAccess, Serializable {
        private static final long serialVersionUID = 8842843931221139166L;

        @Override
        public boolean contains(Object object) {
            return false;
        }

        @Override
        public int size() {
            return 0;
        }

        @Override
        public Object get(int location) {
            throw new IndexOutOfBoundsException();
        }

        private Object readResolve() {