读书笔记《Java并发编程的艺术 - 方腾飞》- 并发的两个‘老‘问题

public class DeadLockDemo {
    privat static String A = "A";
    private static String B = "B";
    public static void main(String[] args) {
              new DeadLockDemo().deadLock();
    }
    private void deadLock() {
              Thread t1 = new Thread(new Runnable() {
                        @Override
                        publicvoid run() {
                                  synchronized (A) {
                                          try { Thread.currentThread().sleep(2000);
                                          } catch (InterruptedException e) {
                                                    e.printStackTrace();
                                          }
                                          synchronized (B) {
                                                    System.out.println("1");
                                          }
                                  }
                        }
              });
              Thread t2 = new Thread(new Runnable() {
                        @Override
                        publicvoid run() {
                                  synchronized (B) {
                                          synchronized (A) {
                                            System.out.println("2");
                                    }
                          }
                }
      });
      t1.start();
      t2.start();
}
}