Java uses Callable and Future to return the results of thread execution

Java uses Callable and Future to return the results of thread execution

We may need to return the result of a thread execution under some special requirements. The Callable and Futrue functions provided in java 1.5 can help you achieve this! Read the code without explanation

 

Package cn.kge.com; 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 Demo2 {public static void main (String [] args) {ExecutorService threadPool = Executors. newSingleThreadExecutor (); Future

 
  
Future = threadPool. submit (new Callable

  
   
() {Public String call () {String str = "hello"; try {Thread. sleep (2000);} catch (InterruptedException e) {e. printStackTrace ();} return str + "world" ;}}); try {System. out. println ("execution result:" + future. get ();} catch (InterruptedException e) {e. printStackTrace ();} catch (ExecutionException e) {e. printStackTrace ();}}}

  

 

Execution result: helloworld