了解线程Join()方法

Join的官方解释: 阻塞调用线程，直到某个线程终止或经过了指定时间为止
Q:谁是调用线程?

A:Join代码写在那，哪个就是调用线程，在本例中主线程是调用线程

Q:某个线程又是指的是谁?
A:如本例thread1执行了Join方法,thread1为某个线程

using System;
using System.Threading;

class Join
{
    static int len1 = 5;
    static int len2 = 6;

    private static string[] w1 = new string[len1];
    private static string[] w2 = new string[len2];
    
    public static void Worker1()
    {
        for (int i = 0; i < len1; i++)
        {
            w1[i] ="方法1--" + i.ToString();
            AddTime(1);
            Console.WriteLine(w1[i]);
        }
    }

    public static void Worker2()
    {
        for (int i = 0; i < len2; i++)
        {
            w2[i] = "方法2--" + i.ToString();
            AddTime(1);
            Console.WriteLine(w2[i]);
        }
    }

    //模拟代码执行时间
    private static void AddTime(int s)
    {
        DateTime d = DateTime.Now;
        while (d.AddSeconds(s) > DateTime.Now){ }
    }

    static void Main(string[] args)
    {
        Thread thread1 = new Thread(new ThreadStart(Worker1));
        Thread thread2 = new Thread(new ThreadStart(Worker2));

        thread2.Start();
        thread1.Start();

        //阻塞主线程，直到thread1线程终止为止
        //这时在thread1没有执行完，后面的代码是无法执行的。
        //当然thread2执不执行完是不管的，并且thread1与thread2是同时无顺运行的。
        thread1.Join();

        Console.WriteLine("方法1已全部执行完成！");
        for (int i = 0; i < 5; i++)
        {
            Console.WriteLine("主线程开始执行--" + i.ToString());
            AddTime(2);
        }
    }
}