config.json

{
  "node_id": "569d5e11c4fc5de7844053d9a733c5e8",
  "keywords": [],
  "children": [
    {
      "实现折扣服务": {
        "keywords": [],
        "children": []
      }
    },
    {
      "使用Discount服务": {
        "keywords": [],
        "children": []
      }
    },
    {
      "构造同步和异步操作": {
        "keywords": [],
        "children": []
      }
    },
    {
      "将两个CompletableFuture对象整合起来，无论它们是否存在依赖": {
        "keywords": [],
        "children": []
      }
    },
    {
      "对Future和Completable-Future的回顾": {
        "keywords": [],
        "children": []
      }
    },
    {
      "高效地使用超时机制": {
        "keywords": [],
        "children": []
      }
    }
  ],
  "export": []
}