Convert String[] to comma separated string in java

Question

i have one String[]

String[] name = {\"amit\", \"rahul\", \"surya\"};

i want to send name as parameter in sql query inside IN

Answer 1

In java 8 for none string array and none primitive object (Long, Integer, ...)

List ids = Arrays.asList(1l, 2l,3l);
ids.stream().map(String::valueOf).collect(Collectors.joining(","))))

In java 8 for specific field of an objets array (example a car with 2 fields color and speed)

List cars= Cars.asList(car1, cars2,car3);
    cars.stream().map(Car::getColor).collect(Collectors.joining(","))))

Combine map with valueOf for none String field of an array of objects