如何通过jstack命令dump线程信息

class DeadLockDemo {
  private 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
      public void 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
      public void run() {
        synchronized (B) {
          synchronized (A) {
            System.out.println("2");
          }
        }
      }
    });

    t1.start();
    t2.start();

  }
}