Java 多线程模拟年会入场：统计人数和彩票号码

import java.util.Random;

public class AnnualMeeting { private static int numEmployees = 100; private static int numEntrances = 2; private static int numTickets = 2; private static int[] entranceCounts = new int[numEntrances]; private static int[][] tickets = new int[numEmployees][numTickets];

public static void main(String[] args) {
    Thread[] threads = new Thread[numEmployees];
    for (int i = 0; i < threads.length; i++) {
        threads[i] = new Thread(new Employee(i));
        threads[i].start();
    }
    for (Thread thread : threads) {
        try {
            thread.join();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
    for (int i = 0; i < numEntrances; i++) {
        System.out.println('Entrance ' + (i+1) + ' count: ' + entranceCounts[i]);
    }
    for (int i = 0; i < numEmployees; i++) {
        System.out.println('Employee ' + (i+1) + ' tickets: [' + tickets[i][0] + ', ' + tickets[i][1] + ']');
    }
}

static class Employee implements Runnable {
    private int id;
    private Random random;

    public Employee(int id) {
        this.id = id;
        this.random = new Random();
    }

    @Override
    public void run() {
        int entrance = random.nextInt(numEntrances);
        synchronized (AnnualMeeting.class) {
            entranceCounts[entrance]++;
            tickets[id][0] = random.nextInt(33) + 1;
            tickets[id][1] = random.nextInt(16) + 1;
        }
    }
}

}