玉风 - 云代码空间
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| package app; |
| import java.util.LinkedList; |
| import java.util.Queue; |
| public class App { |
| public static void main(String[] args) { |
| new Thread(new Runner(0)).start(); |
| new Thread(new Runner(1)).start(); |
| new Thread(new Runner(2)).start(); |
| new Thread(new Runner(3)).start(); |
| } |
| static class Runner implements Runnable { |
| int no; |
| static Queue<Character> queue = new LinkedList<>(); |
| static { |
| for (int i = 0; i < 10; i++) { |
| queue.offer('A'); |
| queue.offer('B'); |
| queue.offer('C'); |
| queue.offer('D'); |
| } |
| } |
| Runner(int no) { |
| this.no = no; |
| } |
| @Override |
| public void run() { |
| while (queue.size() != 0) { |
| synchronized (queue) { |
| if (queue.size() != 0 && no == (40 - queue.size()) % 4) { |
| System.out.println(queue.poll()); |
| } |
| } |
| } |
| } |
| } |
| } |