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