package chapter2;

import java.util.ArrayList;

/**
 * Created by 13 on 2017年5月4日.
 */
public class ArrayListMultiThread {
 static ArrayList<Integer> arrayList = new ArrayList<Integer>(10);

 public static class AddThread implements Runnable {

 /**
 * When an object implementing interface <code>Runnable</code> is used
 * to create a thread, starting the thread causes the object's
 * <code>run</code> method to be called in that separately executing
 * thread.
 * <p/>
 * The general contract of the method <code>run</code> is that it may
 * take any action whatsoever.
 *
 * @see Thread#run()
 */
 @Override
 public void run() {
 for (int i = 0; i < 10000; i++) {
 arrayList.add(i);
 }
 }
 }

 /**
 * ArrayList是一个线程不安全的容器,多线程操作时会出现冲突,报错信息如下:
 * Exception in thread "Thread-1" java.lang.ArrayIndexOutOfBoundsException: 22
 * at java.util.ArrayList.add(ArrayList.java:441)
 * at chapter2.ArrayListMultiThread$AddThread.run(ArrayListMultiThread.java:27)
 * at java.lang.Thread.run(Thread.java:745)
 *
 * Vector是一个线程安全的容器,可以代替ArrayList
 *
 * @param args
 * @throws InterruptedException
 */
 public static void main(String args[]) throws InterruptedException {
 Thread thread1 = new Thread(new AddThread());
 Thread thread2 = new Thread(new AddThread());

 thread1.start();
 thread2.start();

 thread1.join();
 thread2.join();

 System.out.println(arrayList.size());
 }

}