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ArrayList<String> list1 = new ArrayList<String>();
ArrayList<Integer> list2= new ArrayList<Integer>();
System.out.println(list1.getClass() == list1.getClass());
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list2.getClass().getMethod("add",
Object.class).invoke(list2, "abc");
System.out.println(collection3.get(0));
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l ÊõÓÀýÈçArrayList<E>ÀඨÒåºÍArrayList<Integer>ÀඨÒå
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n ArrayList<E>ÖеÄE³ÆÎªÀàÐͱäÁ¿»òÀàÐͲÎÊý
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n ArrayList<Integer>ÖÐ<>Äî×Åtypeof
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