自定义类的equals函数

仅作笔记使用

public class VectorQueue {

	private final Vector queue;

	private class VectorItem {
		private final Object item;
		private final int quantity;

		public VectorItem(Object item, Integer quantity) {
			this.item = item;
			this.quantity = quantity;
		}

		@Override
		public boolean equals(Object o) {
			if (o instanceof VectorItem) {
				return this.item.equals(((VectorItem) o).item);
			}
			return false;
		}

		@Override
		public int hashCode() {
			return this.item.hashCode();
		}
	}

	public VectorQueue() {
		this.queue = new Vector(10);
	}

	public void removeItem(Object item) {
		queue.removeElement(new VectorItem(item, null));
	}

	public boolean isQueued(Object item) {
		return queue.contains(new VectorItem(item, null));
	}
}