黑马程序员_创建一个死锁

创建一个死锁，使用同步中嵌套同步。

public class ThreadDemo4
{
 public static void main(String[] args)
 {
  Thread t1=new Thread(new Deadtest(true));
  Thread t2=new Thread(new Deadtest(false));
  
  t1.start();
  t2.start();
 }
 
}

class Deadtest implements Runnable
{
 private boolean flag;
 Deadtest(boolean flag)
 {
  this.flag=flag;
 }
 
 public void run()
 {
  if(flag)
  {
   synchronized(MyLock.locka)
   {
    System.out.println("if locka");
    synchronized(MyLock.lockb)
    {
     System.out.println("if lockb");
    }
   }
  }
  else
  {
   synchronized(MyLock.lockb)
   {
    System.out.println("else lockb");
    synchronized(MyLock.locka)
    {
     System.out.println("else locka");
    }
   }
  }
 }
}

class MyLock
{
  static Object locka = new Object();
  static Object lockb = new Object();
}