题目:
  启动若干线程,并行访问同一个容器中的数据。保证获取容器中数据时没有数据错误,且线程安全。如:售票,秒杀等业务。
import java.util.ArrayList;
import java.util.List;

public class Test_01 {

    static List<String> list = new ArrayList<>();
//    static List<String> list = new Vector<>();

    static {
        for (int i = 0; i < 10000; i++) {
            list.add("String " + i);
        }
    }

    public static void main(String[] args) {
        for (int i = 0; i < 10; i++) {
            new Thread(new Runnable() {
                @Override
                public void run() {
                    while (list.size() > 0) {
                        System.out.println(Thread.currentThread().getName() + " - " + list.remove(0));
                    }
                }
            }, "Thread" + i).start();
        }
        
//        for(int i = 0; i < 10; i++){
//            new Thread(new Runnable() {
//                @Override
//                public void run() {
//                    while(true){
//                        synchronized (list) {
//                            if(list.size() <= 0){
//                                break;
//                            }
//                            System.out.println(Thread.currentThread().getName() + " - " + list.remove(0));
//                        }
//                    }
//                }
//            }, "Thread" + i).start();
//        }
    }

}
import java.util.Queue;
import java.util.concurrent.ConcurrentLinkedQueue;

public class Test_02 {

    static Queue<String> list = new ConcurrentLinkedQueue<>();

    static {
        for (int i = 0; i < 10000; i++) {
            list.add("String " + i);
        }
    }

    public static void main(String[] args) {
        for (int i = 0; i < 10; i++) {
            new Thread(new Runnable() {
                @Override
                public void run() {
                    while (true) {
                        String str = list.poll();
                        if (str == null) {
                            break;
                        }
                        System.out.println(Thread.currentThread().getName() + " - " + str);
                    }
                }
            }, "Thread" + i).start();
        }
    }

}

 

posted on 2019-04-23 00:40  kosamino  阅读(167)  评论(0编辑  收藏  举报