死锁解决

package deadLock;

public class SolveDeadLock implements Runnable
{
  public int flag = 1;
  static Object o1 = new Object(),o2 = new Object();
  public void run()
  {
    if (flag == 1)// 当flag==1锁住o1
    {
      System.out.println("t1线程启动:锁住了o1并去睡觉");
      synchronized (o1)
      {
        try
        {
          Thread.sleep(100);
        } 
        catch (Exception e)
        {
          e.printStackTrace();
        }
        System.out.println("t1线程醒来:等待着t2线程将o2的钥匙归还...");
        try 
        {
          o1.wait();//让线程t1出于等待状态
        } 
        catch (InterruptedException e) 
        {
          e.printStackTrace();
        }
        o1.notify();//唤醒线程t1
        synchronized (o2)// 只要锁住o2就完成
        {
          System.out.println("t2线程执行完任务后,将o2的钥匙归还给t1,t1线程拿到了钥匙,并执行完成了任务");
        }
      }
    }
    if (flag == 0)// 如果flag==0锁住o2
    {
      System.out.println("t2线程启动:锁住了o2并去睡觉");
      synchronized (o2)
      {
        try
        {
          Thread.sleep(100);
        } 
        catch (Exception e)
        {
          e.printStackTrace();
        }
        System.out.println("t2线程醒来:等待着t1线程将o1的钥匙归还...");
        synchronized (o1)
        {
          System.out.println("t2线程醒来执行完了任务");
          o1.notify();
        }

      }

    }

  }
  public static void main(String[] args)
  {
    SolveDeadLock td1 = new SolveDeadLock();
    SolveDeadLock td2 = new SolveDeadLock();
    td1.flag = 1;
    td2.flag = 0;
    new Thread(td1).start();
     new Thread(td2).start();
  }
}