Arr example

Example.java

   public class ExampleArr{
   public static void main(String[] args) {
        int[][] arr2 = new int[3][4];
        Random random = new Random();
        
        for(int[] arr : arr2){
            for (int i = 0; i < arr.length; i++) {
                arr[i] = random.nextInt();
            }
        }
        
        
        int newArrLength = arr2.length * arr2[0].length;
        int[] newArr = new int[newArrLength];
        
        int offset = 0;
        
        for (int arr[] : arr2){
            System.arraycopy(arr, 0, newArr, offset, arr.length);
            offset = arr.length;
        }
        
        
        //var 2


        int pointer = 0;
        
        for (int i = 0; i < arr2.length; i++) {
            for (int j = 0; j < arr2[i].length; j++) {
                newArr[pointer] = arr2[i][j];
                pointer++;
            }
        }
    }
}