?????????????ArrayList??LinkedList?????????
????1.ArrayList?????????????????????????LinkedList????????????????
????2.???????????get??set??ArrayList????????LinkedList?????LinkedList???????
????3.?????????????????add??remove??LinedList????????????ArrayList?????????
????ArrayList??LinkedList????????????????洢???е????????(references)???????????????ArrayList???洢???е?String????Integer?????ArrayList??LinkedList????????????????????????????ArrayList??????????LinkedList???
?????????臨???
??????????????????ArrayList????????????????????????????????????get?????????б??е????????????(random access)????????????LinkedList??LinkedList?е?get??????????????б?????????飬?????????????LinkedList??????????б??е????????????и??????????
??????????????????????б???????????????????????????б??????ArrayList????????????LinkedList???????????????????б??????ж??????(binary search)??????б???ArrayList??LinkedList???????????????????
package testlist;
import java.util.LinkedList;
import java.util.List;
import java.util.Random;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
public class TestList {
public static final int N = 50000;
public static List<Integer> values;
static {
Integer vals[] = new Integer[N];
Random r = new Random();
for (int i = 0?? currval = 0; i < N; i++) {
vals[i] = new Integer(currval);
currval += r.nextInt(100) + 1;
}
values = Arrays.asList(vals);
}
static long timeList(List<Integer> lst) {
long start = System.currentTimeMillis();
for (int i = 0; i < N; i++) {
int index = Collections.binarySearch(lst?? values.get(i));
if (index != i)
System.out.println("***????***");
}
return System.currentTimeMillis() - start;
}
public static void main(String args[]) {
System.out.println("ArrayList???????" + timeList(new ArrayList<Integer>(values)));
System.out.println("LinkedList???????" + timeList(new LinkedList<Integer>(values)));
}
}
????????????????
????ArrayList???????31
????LinkedList???????30688