I am taking the size of an array in a variable in a loop. Each time I have to assign the size of the array equal to that variable and then take integers equal to that size. For example:
for(i = 0; i < N; i++)
{
variable = sc.nextInt();
int []array = new int[variable];
for(j = 0; j < variable; j++)
{
array[j] = sc.nextInt();
}
}
Please provide me the most efficient method as I am new to java :)
Maybe you need something like this :
List<int[]> list = new ArrayList<>();//create a list or arrays
for (int i = 0; i < n; i++) {
int variable = sc.nextInt();
int[] array = new int[variable];
for (int j = 0; j < variable; j++) {
array[j] = sc.nextInt();
}
list.add(array);//add your array to your list
}
You can create a list of arrays and initialize them on outer loop and add values to arrays using position i and j.
// initialize list with n, though you can also use 2D array as well
List<int[]> array = new ArrayList<>(n);
for (int i = 0; i < n; i++) {
variable = sc.nextInt();
// create an array and add it to list
array.add(new int[variable]);
for (int j = 0; j < variable; j++) {
// fetch the array and add values using index j
array.get(i)[j] = sc.nextInt();
}
}
for(i=0;i<N;i++)
{
variable = sc.nextInt();
ArrayList array = new ArrayList(variable)
for(j=0;j<variable;j++)
{
int input = sc.nextInt()
array.add(input);
}
}
If an ArrayList works, this is how I'd do it.
for(i=0;i<N;i++)?