java 将list<Map>转成map

可以使用Java 8的Stream API来实现，示例代码如下：

List<Map<String, Object>> list = new ArrayList<>();
Map<String, Object> map1 = new HashMap<>();
map1.put("key1", "value1");
map1.put("key2", "value2");
list.add(map1);
Map<String, Object> map2 = new HashMap<>();
map2.put("key3", "value3");
map2.put("key4", "value4");
list.add(map2);

Map<String, Object> result = list.stream()
    .flatMap(map -> map.entrySet().stream())
    .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));

System.out.println(result);

输出结果为：

{key1=value1, key2=value2, key3=value3, key4=value4}