String[] arr = new String[]{"1","2"}; Listlist 和set 转化strings = Arrays.asList(arr); String[] strings1 = strings.toArray(new String[0]);
String[] arr = new String[]{"1","2"}; Listlist 和map转化strings = Arrays.asList(arr); Set set = new HashSet<>(strings); List strings1 = new ArrayList<>(set);
String[] arr = new String[]{"1","2"}; Liststrings = Arrays.asList(arr); Set set = new HashSet<>(strings); List strings1 = new ArrayList<>(set); Map collect = strings1.stream().collect(Collectors.toMap(item -> item, item -> item));
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