Answers for "convert integer list to int array java"

6

integer arraylist to int array

//only works in java 8 or later
list.stream().mapToInt(i -> i).toArray();
Posted by: Guest on July-12-2020
1

list to int array in java 8

int[] array = list.stream().mapToInt(i->i).toArray();
Posted by: Guest on July-30-2020
2

convert list of integer to array in java

List<Integer> al = new ArrayList<Integer>(); 
Integer[] arr = new Integer[al.size()]; 
arr = al.toArray(arr);
Posted by: Guest on May-22-2020
0

List of Integer to int array

int [] ints = list.stream().mapToInt(Integer::intValue).toArray();
Posted by: Guest on July-16-2021
0

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]]
Posted by: Guest on January-01-1970

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