import java.util.ArrayList;
import java.util.LinkedList;
-import java.util.ListIterator;
import java.util.concurrent.TimeUnit;
class Main {
- private static <E> void addMiddle(ArrayList<E> array, E value) {
- int mid = array.size() / 2;
- array.add(mid + 1, value);
- }
-
- private static <E> void addMiddle(LinkedList<E> list, E value) {
- int mid = list.size() / 2;
- list.add(mid + 1, value);
- }
-
- /**
- * Should mimic the collection add(int index, T value) method
- * @param array [description]
- * @param value [description]
- * @return [description]
- */
- private static <E> void addMiddleIter(ArrayList<E> array, E value) {
- int mid = array.size() / 2;
- ListIterator<E> iter = array.listIterator();
- int i = 0;
- // go to the element at mid index
- while (iter.hasNext() && i < mid) {
- iter.next();
- i++;
- }
- iter.next(); // Insert before mid + 1
- iter.add(value);
-
- }
-
- /**
- * Should mimic the collection add(int index, T value) method
- * @param list [description]
- * @param value [description]
- * @return [description]
- */
- private static <E> void addMiddleIter(LinkedList<E> list, E value) {
- int mid = list.size() / 2;
- ListIterator<E> iter = list.listIterator();
- int i = 0;
- // go to the element at mid index
- while (iter.hasNext() && i < mid) {
- iter.next();
- i++;
- }
- iter.next(); // Insert before mid + 1
- iter.add(value);
- }
-
- private static <E> void addNEMiddle(ArrayList<E> array, int Nelements) {
- ListIterator<E> iter = array.listIterator();
- int i = 0;
- // go to the element at the middle index
- while (iter.hasNext() && i < array.size() / 2) {
- iter.next();
- i++;
- }
- iter.next(); // Insert before mid + 1
- for (int j = 0; j < Nelements; j++) {
- iter.add((E)new Object());
- }
- }
-
- private static <E> void addNEMiddle(LinkedList<E> list, int Nelements) {
- ListIterator<E> iter = list.listIterator();
- int i = 0;
- // go to the element at the middle index
- while (iter.hasNext() && i < list.size() / 2) {
- iter.next();
- i++;
- }
- iter.next(); // Insert before mid + 1
- for (int j = 0; j < Nelements; j++) {
- iter.add((E)new Object());
- }
- }
-
/**
* The main() function
* @param String[] args main() function arguments array
*/
public static void main(String[] args) {
- ArrayList<Integer> array = new ArrayList<Integer>();
- LinkedList<Integer> list = new LinkedList<Integer>();
+ ListExtension<Integer> array = new ListExtension<Integer>(new ArrayList<Integer>());
+ ListExtension<Integer> list = new ListExtension<Integer>(new LinkedList<Integer>());
for (int i = 0; i < 1000000; i++) {
array.add(i);
long startTime = System.nanoTime();
//for (int i = 0; i < 100000; i++) {
- // addMiddleIter(array, i);
+ // array.addMiddleIter(i);
//}
- addNEMiddle(array, 100000);
+ array.addNEMiddle(100000);
long stopTime = System.nanoTime();
- long execTime = stopTime - startTime;
+ long execTimeArray = stopTime - startTime;
//System.out.println("Insert time in the middle of the ArrayList: " + TimeUnit.NANOSECONDS.toSeconds(execTime) + " s");
- System.out.println("Insert time in the middle of the ArrayList: " + execTime + " ns");
+ System.out.println("Insert time in the middle of the ArrayList: " + execTimeArray + " ns");
startTime = System.nanoTime();
//for (int i = 0; i < 100000; i++) {
- // addMiddleIter(list, i);
+ // list.addMiddleIter(i);
//}
- addNEMiddle(list, 100000);
+ list.addNEMiddle(100000);
stopTime = System.nanoTime();
- execTime = stopTime - startTime;
+ long execTimeLinked = stopTime - startTime;
//System.out.println("Insert time in the middle of the LinkedList: " + TimeUnit.NANOSECONDS.toSeconds(execTime) + " s");
- System.out.println("Insert time in the middle of the LinkedList: " + execTime + " ns");
+ System.out.println("Insert time in the middle of the LinkedList: " + execTimeLinked + " ns");
+ System.out.println("Rapport du temps d'execution ArrayList/LinkedList = " + (execTimeArray / execTimeLinked));
}
}