Generates a return value from the thread--callable interface

Runnable is a standalone thread that performs work, but it does not return any values. If you want the thread to return a value when it is finished, you can implement the callable interface instead of the Runnable interface. The callable introduced in Java SE5 is a generic type parameter with a type parameter that represents the value returned from the method call () (instead of Run ()) and must use the Executorservice.submit () method Call it.

Thread Code:

publicclass ResulttThread implements Callable<String> {    privateint id;    public ResulttThread(int id) {        this.id = id;    }    @Override    public String call() throws Exception {        return"The result id is " + id;    }}

Calling code:

 Future<String> future; ExecutorService mService = Executors.newCachedThreadPool();    for (int05; i++) {       future = mService.submit(new ResulttThread(i));       System.out.println(future.get());    }

Operation Result:

Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.

Generates a return value from the thread--callable interface