What is the difference between CompletableFuture and Future in Java 9?

CompletableFuture class implements the Future interface in Java. CompletableFuture Can be used as a Future that has been explicitly completed. Future The interface does not provide many functions. We need to use the get() method to obtain the results of asynchronous calculation. This method will be blocked, so there is no way to non-blocking Run multiple dependent tasks in a way, and the CompletableFuture class can provide the function of running multiple dependent tasks in a chain. These tasks run in a asynchronous

way, so we can create a Task chains that trigger the next task when the results of the current task are available.

Grammar

<strong>public class CompletableFuture<T> extends Object implements Future<T>, CompletionStage<T></strong>

Example

Translated into Chinese:

Example

import java.util.function.Supplier;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;

public class CompletableFutureTest {
   public static void main(String args[]) throws ExecutionException, InterruptedException {
      Calculator calc = new Calculator(4, 7);
      <strong>CompletableFuture<Integer></strong> future = CompletableFuture.<strong>supplyAsync</strong>(calc);
      future.<strong>thenAccept</strong>(result -> {
         System.out.println(result);
      });
      System.out.println("CompletableFutureTest End.... ");
      Thread.sleep(10000);
   }
}

<strong>// Calculator class</strong>
class Calculator implements <strong>Supplier<Integer></strong> {
   private int x, y;
   public Calculator(int x, int y) {
      this.x = x;
      this.y = y;
   }
   <strong>@Override</strong>
   public Integer get() {
      try {
         Thread.sleep(3000);
      } catch(InterruptedException e) {
         e.printStackTrace();
      }
      return x + y;
   }
}

Output

<strong>CompletableFutureTest End....
11</strong>

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