JAVA

list to int array in java 8

int[] array = list.stream().mapToInt(i->i).toArray();

how to convert int array to Integer List in java

int[] ints = {1,2,3};
List<Integer> list = Arrays.stream(ints).boxed().collect(Collectors.toList());

convert int array to integer list java

int[] arr = {1,2,3};
IntStream.of(arr).boxed().collect(Collectors.toList());

convert list of integer to array in java

List<Integer> al = new ArrayList<Integer>(); 
Integer[] arr = new Integer[al.size()]; 
arr = al.toArray(arr); 

convert int[] to list java

int arr[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
List lst = Arrays.asList(arr);
System.out.println(lst.size());

convert array of int to arraylist java

int[] ints = {1, 2, 3};
List<Integer> intList = new ArrayList<Integer>(ints.length);
for (int i : ints)
{
    intList.add(i);
}

List of Integer to int array

int[] example1 = list.stream().mapToInt(i->i).toArray();
// OR
int[] example2 = list.stream().mapToInt(Integer::intValue).toArray();

List of Integer to int array

int [] ints = list.stream().mapToInt(Integer::intValue).toArray();

convert list to int array

 list.stream().mapToInt(i->i).toArray();

convert Integer arraylist to array java

Your_ArrayList_Name.stream().mapToInt(k->k).toArray();