Existing T1, T2, T3 three threads, how do you ensure that T2 execution after T1 execution, T3 execution after T2 execution?

Study Join

/** *  existing T1, T2, T3 three threads, how do you guarantee T2 execution after T1 execution, T3 execute after T2 execution?  *  @author  user * */public class test3 {public static void  main (String[] args)  throws interruptedexception {thread t1 = new  thread (New t1 ()); Thread t2 = new thread (New t2 ()); Thread t3 = new thread (New t3 ()); T1.start (); T1.join (); T2.start (); T2.join (); T3.start (); T3.join ();}} class t1 implements runnable{@Overridepublic  void run ()  {system.out.println ( Thread.CurrentThread () + "T1"); Try {thread.sleep (3000);}  catch  (interruptedexception e)  {e.printstacktrace ();}} class t2 implements runnable{@Overridepublic  void run ()  {system.out.println ( Thread.CurrentThread () + "T2"); Try {thread.sleep (3000);}  catch  (interruptedexception e)  {e.printstacktrace ();}} class t3 implements  runnable{@Overridepublic  void run ()  {system.out.println (Thread.CurrentThread () + "T3"); try { Thread.Sleep (3000);}  catch  (interruptedexception e)  {e.printstacktrace ();}}

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Existing T1, T2, T3 three threads, how do you ensure that T2 execution after T1 execution, T3 execution after T2 execution?