{
  "node_id": "569d5e11c4fc5de7844053d9a733c5e8",
  "keywords": [],
  "children": [
    {
      "创建Optional对象": {
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      }
    },
    {
      "使用map从Optional对象中提取和转换值": {
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      }
    },
    {
      "使用flatMap链接Optional对象": {
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      }
    },
    {
      "操纵由Optional对象构成的Stream": {
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    },
    {
      "默认行为及解引用Optional对象": {
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      }
    },
    {
      "两个Optional对象的组合": {
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      }
    },
    {
      "使用filter剔除特定的值": {
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      }
    }
  ],
  "export": []
}