How the JUC thread implements the Callable interface
This article focuses on "how to implement the Callable interface with JUC threads". Interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn "how the Callable thread implements the JUC interface".
Java 5.0provides a new way to create execution threads in java.util.concurrent: the Callable interface
The Callable interface is similar to Runnable in that both are designed for classes whose instances can be executed by another thread. However, Runnable does not return a result and cannot throw a checked exception.
Callable depends on FutureTask, and FutureTask can also be used as a lock
Package com.gf.demo
Import java.util.concurrent.Callable
Import java.util.concurrent.ExecutionException
Import java.util.concurrent.FutureTask
/ * the third way to create a thread is to implement the Callable interface. Compared to the way the Runnable interface is implemented, a method can have a return value and can throw an exception. * * 2. To execute Callable, you need the support of FutureTask implementation class to accept the operation results. FutureTask is the implementation class of Future interface * * /
Public class TestCallable {public static void main (String args []) {ThreadDemo td = new ThreadDemo (); FutureTask result = new FutureTask (td); new Thread (result). Start (); try {Integer sum = result.get (); System.out.println (sum) System.out.println ("-");} catch (ExecutionException | InterruptedException e) {e.printStackTrace ();}
Class ThreadDemo implements Callable {@ Override public Integer call () throws Exception {int num = 0; for (int I = 0; I < Integer.MAX_VALUE; iTunes +) {num = num + I;} return num;}
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