Explanation of Solution
Method:
//define a method
public void retainAll(HashIntSet other) {
//loop executed for the length of the array
for (int i = 0; i < elementData.length; i++) {
//condition initialized to check whether the array element is equal to null or not
if (elementData[i] != null) {
//loop initialized till the array value is not equal to null and element is contained in other
while (elementData[i] != null && !other.contains(elementData[i].data)) {
//assign the value
elementData[i] = elementData[i].next;
//decrement the value
size--;
}
//assign the value
Node current = elementData[i];
//loop initialized till the value of current is not equal to null and the next value is not equal to null
while (current != null && current.next != null) {
//condition initialized to check whether the next value of current is contained in other
if (!other.contains(current.next.data)) {
//assign the value
current...
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