11 2021 档案
摘要：An ArrayList provides an alternative way of storing a list of objects and has the following advantages over an array: An ArrayList shrinks and grows a
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摘要：先看段代码： InfoOfDay day = new InfoOfDay(); List<String> list =day.getIncidentList(); list = new ArrayList<>() ; list.add("hu"); List<String> list1 =day.g
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