How to add each element in of two list using stream api in java-CodePudding

partnersName =["partner1","partner2"];

totalDates = ["2022-05-18","2022-05-19"];

both the lists store string only

here is the following code which gives output that I want

 for (int i = 0; i < partnersName.size(); i  ) {
        if (totalDates.isEmpty()) {
            totalDates.add(partnersName.get(i));
        } else {
            for (int j = 0; j < totalDates.size(); j  ) {
                totalDates.set(j, partnersName.get(i)  "/"  totalDates.get(j));
            }
        }
    }

output =["partner1/2022-05-18","partner2/2022-05-18","partner1/2022-05-19","partner2/2022-05-19"];

but I want to reduce the line of code using stream. Anyone could help to get stream API code

CodePudding user response：

Assuming the result [partner1/2022-05-18, partner1/2022-05-19, partner2/2022-05-18, partner2/2022-05-19] is what you want:

List<String> result = partnersName.stream().<String>mapMulti((s, stringConsumer) -> totalDates.forEach(d -> stringConsumer.accept(s   "/"   d))).toList();

CodePudding user response：

Another way can be

List<String> result = partnersName.stream()
                        .flatMap(x -> totalDates.stream().map(y -> x.concat("/" y)))
                        .collect(Collectors.toList());

//output: [partner1/2022-05-18, partner1/2022-05-19, partner2/2022-05-18, partner2/2022-05-19]