System.out.println("---");//Collection<String> list2 = new ArrayList<String>();Collection<String> list2 =newArrayList<>();//JDK 7开始之后后面类型申明可以不写list2.add("Java");//list2.add(23);list2.add("黑马");// 集合和泛型不支持基本数据类型,只能支持引用数据类型//Collection<int> ...
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