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                合規國際互聯網加速 OSASE為企業客戶提供高速穩定SD-WAN國際加速解決方案。 廣告
                ### 概述 集合嵌套并不是一個新的知識點,僅僅是集合內容又是集合,如Collection集合嵌套、Collection集合與Map集合相互嵌套、Map集合嵌套。 **ArrayList嵌套 ArrayList** ``` ArrayList<ArrayList<String>> Collection<ArrayList<Integer>> ``` **Map嵌套 ArrayList** ~~~ HashMap<String, ArrayList<Person>> ArrayList<HashMap<String, String>> ~~~ **Map集合嵌套** ~~~ HashMap<String, HashMap<String,String>> HashMap<String, HashMap<Person,String>> ~~~
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