package com.ycf.study.thread;
class Sources{
 int a;
 public void setA(int x) {
  synchronized (this) {
   this.a = x;
   try {
    Thread.sleep(2000);
   }
   catch (InterruptedException e) {
    e.printStackTrace();
   }
  }
 }
}
public class DeadThreadByExtend {
 public static void main(String[] args) {
  Sources s1 = new Sources();
  Sources s2 = new Sources();
  class MyThread1 extends java.lang.Thread {
   @Override
         public void run() {
    System.out.println("线程1开始");
    synchronized (s1) {
     System.out.println("线程1申请修改s1");
     s1.setA(20);
     System.out.println("线程1修改完成");
     System.out.println("线程1申请修改s2");
     s2.setA(10);
     System.out.println("线程1修改s2完成");
    }
    System.out.println("线程1退出并释放锁++++++++++");
   }
  }
  class MyThread2 extends java.lang.Thread {
   @Override
         public void run() {
    System.out.println("线程2开始");
    synchronized (s2) {
     System.out.println("线程2申请修改s2");
     s2.setA(20);
     System.out.println("线程2修改s2完成");
     System.out.println("线程2申请修改s1");
     s1.setA(10);
     System.out.println("线程2修改s1完成");
    }
    System.out.println("线程2退出并释放锁++++++++++");
   }
  }
  MyThread1 mt1 = new MyThread1();
  MyThread2 mt2 = new MyThread2();
  mt1.start();
  mt2.start();
 }
}