java stream List<Map<String，Double>>需要基于字符串的平均值

List<Map<String, Double>> list = ... ; // 输入的列表
Stream<Map<String, Double>> stream = list.stream().flatMap(map -> map.entrySet().stream());

Stream<Map<String, Double>> filteredStream = stream.filter(map -> map.containsKey("字符串的键"));

DoubleStream doubleStream = filteredStream.mapToDouble(map -> map.get("字符串的键"));

OptionalDouble average = doubleStream.average();

if (average.isPresent()) {
    double result = average.getAsDouble();
    // 对平均值进行后续操作
} else {
    // 平均值不存在的处理逻辑
}