代码
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ArrayList的线程安全与不安全对比演示
语言: Java, 标签: safe list collection thread 2009/02/26发布 1年前更新作者: Programus, 点击635次, 评论(0), 收藏者(0), , 打分:
Java语言: ArrayList的线程安全与不安全对比演示
01 import java.util.ArrayList;
02 import java.util.Collections;
03 import java.util.List;
04 import java.util.Random;
05
06 public class ThreadSafeDemo {
07 public static int demo(final List list, final int testCount) throws InterruptedException {
08 ThreadGroup group = new ThreadGroup(list.getClass().getName() + "@" + list.hashCode());
09 final Random rand = new Random();
10
11 Runnable listAppender = new Runnable() {
12 public void run() {
13 try {
14 Thread.sleep(rand.nextInt(2));
15 } catch (InterruptedException e) {
16 return;
17 }
18 list.add("0");
19 }
20 };
21
22 for (int i = 0; i < testCount; i++) {
23 new Thread(group, listAppender, "InsertList-" + i).start();
24 }
25
26 while (group.activeCount() > 0) {
27 Thread.sleep(10);
28 }
29
30 return list.size();
31 }
32 public static void main(String[] args) throws InterruptedException {
33 List unsafeList = new ArrayList();
34 List safeList = Collections.synchronizedList(new ArrayList());
35 final int N = 10000;
36 for (int i = 0; i < 10; i++) {
37 unsafeList.clear();
38 safeList.clear();
39 int unsafeSize = demo(unsafeList, N);
40 int safeSize = demo(safeList, N);
41 System.out.println("unsafe/safe: " + unsafeSize + "/" + safeSize);
42 }
43 }
44 }
02 import java.util.Collections;
03 import java.util.List;
04 import java.util.Random;
05
06 public class ThreadSafeDemo {
07 public static int demo(final List list, final int testCount) throws InterruptedException {
08 ThreadGroup group = new ThreadGroup(list.getClass().getName() + "@" + list.hashCode());
09 final Random rand = new Random();
10
11 Runnable listAppender = new Runnable() {
12 public void run() {
13 try {
14 Thread.sleep(rand.nextInt(2));
15 } catch (InterruptedException e) {
16 return;
17 }
18 list.add("0");
19 }
20 };
21
22 for (int i = 0; i < testCount; i++) {
23 new Thread(group, listAppender, "InsertList-" + i).start();
24 }
25
26 while (group.activeCount() > 0) {
27 Thread.sleep(10);
28 }
29
30 return list.size();
31 }
32 public static void main(String[] args) throws InterruptedException {
33 List unsafeList = new ArrayList();
34 List safeList = Collections.synchronizedList(new ArrayList());
35 final int N = 10000;
36 for (int i = 0; i < 10; i++) {
37 unsafeList.clear();
38 safeList.clear();
39 int unsafeSize = demo(unsafeList, N);
40 int safeSize = demo(safeList, N);
41 System.out.println("unsafe/safe: " + unsafeSize + "/" + safeSize);
42 }
43 }
44 }
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