Application: gvSIG desktop » gvSIG raster

package org.gvsig.raster.cache.buffer.impl.others;

import java.util.ArrayList;

import org.gvsig.raster.cache.buffer.PxTile;

import org.gvsig.raster.cache.buffer.impl.PxTileImpl;

import org.gvsig.raster.cache.buffer.impl.rocache.ByteBand;

import org.gvsig.raster.cache.buffer.impl.rocache.ReadOnlyCacheBand;

/**

 * This test compare the access time of an element in two cases. The first

 * case is the access to an element in a simple array of objects. The second

 * case is the access to an element in an ArrayList.

 *  

 * @author Nacho Brodin (nachobrodin@gmail.com)

 *

 */

public class ArrayVsArrayList {

        public static int N = 500000;

        /**

         * @param args

         */

        public static void main(String[] args) {

                ArrayVsArrayList p = new ArrayVsArrayList();

                p.array();

                p.arrayList();

        }

        private void array() {

                long t1 = System.currentTimeMillis();

                ArrayList<PxTile> stripeList = new ArrayList<PxTile>();

                for (int i = 0; i < 1; i++) 

                        stripeList.add(new PxTileImpl(0, 0, 0, 0));

                ReadOnlyCacheBand[] l = new ReadOnlyCacheBand[N];

                for (int i = 0; i < N; i++) {

                        ByteBand b =  new ByteBand(stripeList, null, 15, 15, 15, 2345, 3244);

                        l[i] = b;

                }

                int z = 0;

                for (int i = 0; i < N; i++) {

                        int y = l[i].getBandNumber();

                        z += y;

                }

                long t2 = System.currentTimeMillis();

                System.out.println("Time Array with " + N + " elements: " + (t2 - t1) + " milisegundos" + z);

        }

        private void arrayList() {

                long t1 = System.currentTimeMillis();

                ArrayList<PxTile> stripeList = new ArrayList<PxTile>();

                for (int i = 0; i < 1; i++) 

                        stripeList.add(new PxTileImpl(0, 0, 0, 0));

                ArrayList<ReadOnlyCacheBand> l = new ArrayList<ReadOnlyCacheBand>();

                for (int i = 0; i < N; i++) {

                        ByteBand b =  new ByteBand(stripeList, null, 15, 15, 15, 2345, 3244);

                        l.add(b);

                }

                int z = 0;

                for (int i = 0; i < N; i++) {

                        int y = l.get(i).getBandNumber();

                        z += y;

                }

                long t2 = System.currentTimeMillis();

                System.out.println("Time ArrayList with " + N + " elements: " + (t2 - t1) + " milisegundos" + z);

        }

}