How to convert List to int[] in Java? [duplicate]

Answer 1

Using a lambda you could do this (compiles in jdk lambda):

public static void main(String ars[]) {
        TransformService transformService = (inputs) -> {
            int[] ints = new int[inputs.size()];
            int i = 0;
            for (Integer element : inputs) {
                ints[ i++ ] = element;
            }
            return ints;
        };

        List inputs = new ArrayList(5) { {add(10); add(10);} };

        int[] results = transformService.transform(inputs);
    }

    public interface TransformService {
        int[] transform(List inputs);
    }