Write code using a for loop that takes an array int[] ns and will construct a new IntList x5 object whose initial elements are populated with the values in ns, and then followed by zeros. So, for example, if ns = {5,2,6,7}, after running your code, System.out.println(x5.toString(6) ); will output 5, 2, 6, 7, 0, 0

Here's the code:

int[] ns = {5, 2, 6, 7};
IntList x5 = new IntList();

for (int i = 0; i < ns.length; i++) {
    x5.add(ns[i]);
}

for (int i = 0; i < 2; i++) {
    x5.add(0);
}

System.out.println(x5.toString(6));

In this code, we first create an array `ns` containing some integer values. We then create a new `IntList` object called `x5`.

We use a `for` loop to iterate over the elements in `ns`, and add each element to the `x5` list using the `add()` method.

Next, we use another `for` loop to add two zeros to the end of the list.

Finally, we print the contents of the list using the `toString()` method with a parameter of `6`, which specifies that we want to output the first six elements of the list. This will output `5, 2, 6, 7, 0, 0`, as desired.