//only works in java 8 or later
list.stream().mapToInt(i -> i).toArray();
int[] arr = {1,2,3};
IntStream.of(arr).boxed().collect(Collectors.toList());
import java.util.*;
import java.util.stream.Collectors;
// java 8+
List<Integer> list = Arrays.stream(nums).boxed().collect(Collectors.toList());
// java 16+
List<Integer> list = Arrays.stream(nums).boxed().toList();
List<Integer> al = new ArrayList<Integer>();
Integer[] arr = new Integer[al.size()];
arr = al.toArray(arr);
int[] ints = {1, 2, 3};
List<Integer> intList = new ArrayList<Integer>(ints.length);
for (int i : ints)
{
intList.add(i);
}
//use this if you don't want to use any methods to convert an
//arrayList(with the same size as required array) to a 'int[]' type.
//Also, this is only useful when you know the size of the array you're working with.
int[] array = new int[size];
for (int i = 0; i < array.length; i++) {
ans[i] = arraylist.get(i);
}
// array will be now of int[] type
// Also as @FineFinch pointed it could be done using :
//only works in java 8 or later
list.stream().mapToInt(i -> i).toArray();
int[] ints = {1, 2, 3};
List<Integer> intList = new ArrayList<Integer>(ints.length);
for (int i : ints)
{
intList.add(i);
}
templist.stream().mapToInt(i->i).toArray();
Your_ArrayList_Name.stream().mapToInt(k->k).toArray();