package com.brianway.learning.java.multithread.communication.example0;public class IsAlive extends Thread {@Overridepublic void run() {    System.out.println("run---" + this.isAlive());}public static void main(String args[]) {    IsAlive isAlive = new IsAlive();    Thread thread = new Thread(isAlive);    System.out.println("begin---" + thread.isAlive());    thread.start(); //[1]    thread.run(); //[2]    isAlive.start(); //[3]    isAlive.run(); //[4]    System.out.println("end---" + thread.isAlive());}}如圖所示代碼，注釋[2] [3] [4]步，則打印：begin---falseend---truerun---false 這個(gè)不懂為什么？如圖所示代碼，注釋[1] [3] [4]步，則打?。篵egin---falserun---false 這個(gè)難道是隨機(jī)的么？可能為true，也可能為falseend---false如圖所示代碼，注釋[1] [2] [4]步，則打印：這種情況比較好理解begin---falseend---falserun---true如圖所示代碼，注釋[1] [2] [3]步，則打?。篵egin---falserun---false 為什么使用isAlive.run()的時(shí)候，是false呢？end---false