list to int array in java 8
int[] array = list.stream().mapToInt(i->i).toArray();list to int array in java 8
int[] array = list.stream().mapToInt(i->i).toArray();convert list of integer to array in java
List<Integer> al = new ArrayList<Integer>();
Integer[] arr = new Integer[al.size()];
arr = al.toArray(arr);Java 7. Converting List<List<Integer>> to int
// original list
List<List<Integer>> list = Arrays.asList(
Arrays.asList(1, 2),
Arrays.asList(2),
Arrays.asList(3));
// initialize the array,
// specify only the number of rows
int[][] arr = new int[list.size()][];
// iterate through the array rows
for (int i = 0; i < arr.length; i++) {
// initialize the row of the array,
// specify the number of elements
arr[i] = new int[list.get(i).size()];
// iterate through the elements of the row
for (int j = 0; j < arr[i].length; j++) {
// populate the array
arr[i][j] = list.get(i).get(j);
}
}
// output
System.out.println(Arrays.deepToString(arr));
// [[1, 2], [2], [3]]Copyright © 2021 Codeinu
Forgot your account's password or having trouble logging into your Account? Don't worry, we'll help you to get back your account. Enter your email address and we'll send you a recovery link to reset your password. If you are experiencing problems resetting your password contact us
