dosubot[bot] commented on issue #2539:
URL:
https://github.com/apache/incubator-hugegraph/issues/2539#issuecomment-2141161368
<!-- Answer -->
`edge.vertices(Direction.BOTH);` 返回一个迭代器对象而不是单个顶点对象，因为它可能会返回多个顶点。具体来说，当方向是
`BOTH` 时，它包括边的源顶点和目标顶点。该方法设计用于处理不同的方向（`OUT`、`IN`、`BOTH`），在 `BOTH`
的情况下，需要返回两个顶点，因此使用迭代器来容纳多个结果。
```java
@Watched(prefix = "vertex")
@Override
public Iterator<Vertex> vertices(Direction direction, String... edgeLabels) {
Iterator<Edge> edges = this.edges(direction, edgeLabels);
return this.graph().adjacentVertices(edges);
}
```
这个代码片段来自 `HugeVertex` 类，显示了对于 `BOTH`
方向，该方法检索两个方向的边，然后返回相邻顶点的迭代器。这种设计确保了方法能够高效地处理多个顶点<sup>[[1]](https://github.com/apache/incubator-hugegraph/blob/master/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/structure/HugeVertex.java)</sup><sup>[[2]](https://github.com/apache/incubator-hugegraph/blob/master/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/structure/HugeEdge.java)</sup>。
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