Java 9中的CompletableFuture和Future之间的区别？

语法

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

示例

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);
      CompletableFuture<Integer> future = CompletableFuture.supplyAsync(calc);
      future.thenAccept(result -> {
         System.out.println(result);
      });
      System.out.println("CompletableFutureTest End.... ");
      Thread.sleep(10000);
   }
}// Calculator classclass Calculator implements Supplier<Integer> {
   private int x, y;
   public Calculator(int x, int y) {
      this.x = x;
      this.y = y;
   }
   @Override   public Integer get() {
      try {
         Thread.sleep(3000);
      } catch(InterruptedException e) {
         e.printStackTrace();
      }
      return x + y;
   }
}

输出结果

CompletableFutureTest End....
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