如何使用Streams＆Lambda Java8将List <Object []>转换为Map <String，BigInteger>

Question

I have the data as:

List<Object[]> result=fromDB();

How can I write the code below with Streams in Java 8?

Map<String,BigInteger> map= new HashMap<>();
for (Object[] obj : result) {
    map.put((String)obj[0], (BigInteger)obj[1])
}

Answer 1

Map<String, BigInteger> map =
    fromDB().stream()
            .collect(Collectors.toMap(
                o -> (String) o[0],
                o -> (BigInteger) o[1],
                (b1, b2) -> b2
            ));