//例子 Map<Integer, String> mapDemo = new HashMap<>(); map.put(10, "apple"); map.put(20, "orange"); map.put(30, "banana"); map.put(40, "watermelon"); map.put(50, "dragonfruit");
一、Map
转 List
//方法1 List<Integer> list1 = new ArrayList(mapDemo.keySet()); //方法2 List<Integer> list2 = mapDemo.keySet().stream().collect(Collectors.toList());
二、Map
转 List
//方法1 List<String> list3 = new ArrayList(mapDemo.values()); //方法2 List<String> list4 = mapDemo.values().stream().collect(Collectors.toList());
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