Examples of asynchronous conversion from future interface to synchronization in java

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Import java. util. concurrent. Callable; Import java. util. concurrent. ExecutionException; Import java. util. concurrent. ExecutorService; Import java. util. concurrent. Executors; Import java. util. concurrent. Future; Public class TestFuture {   Public static void main (String args []) { System. out. println ("hello world ");    ExecutorService es = Executors. newCachedThreadPool (); Future fu = es. submit (new Callable (){ @ Override Public String call () throws Exception { Thread. sleep (10000); // remove it if return directly, but future still works Return "hello world ";    }     }); System. out. println ("hello world1111111111 "); String result = ""; Try { System. out. println ("hello world222222 "); Result = fu. get (); System. out. println ("hello world3333333 "); } Catch (InterruptedException | ExecutionException e ){ // TODO Auto-generated catch block E. printStackTrace ();   } System. out. println (result ); Es. shutdown (); // shutdown the executor  } }