What is the difference between orTimeout() method and completeOnTimeOut() method in Java 9?

##orTimeout() and completeOnTimeOut() methods are both defined in the CompletableFuture class. This method was introduced in Java 9. The orTimeout() method can be used to specify that if a given task is not completed within a specific time, the program stops execution and throws TimeoutException strong>while completeOnTimeOut() Method completes CompletableFuture using the provided value. If not, it will complete before the given timeout. The Chinese translation of

orTimeout()'s syntax

<strong>public CompletableFuture<T> orTimeout(long timeout, TimeUnit unit)</strong>

Example

is:

Example

import java.util.concurrent.CompletableFuture;
import java.util.concurrent.TimeUnit;
public class OrTimeoutMethodTest {
   public static void main(String args[]) throws InterruptedException {
      int a = 10;
      int b = 15;
      <strong>CompletableFuture</strong>.supplyAsync(() -> {
         try {
            TimeUnit.SECONDS.sleep(5);
         } catch(InterruptedException e) {
            e.printStackTrace();
         }
         return a + b;
      })
      .<strong>orTimeout</strong>(4, TimeUnit.SECONDS)
      .<strong>whenComplete</strong>((result, exception) -> {
         System.out.println(result);
         if(exception != null)
            exception.printStackTrace();
      });
      TimeUnit.SECONDS.sleep(10);
   }
}

Output

<strong>25
</strong>

completeOnTimeOut() The Chinese translation of syntax

<strong>public CompletableFuture<T> completeOnTimeout(T value, long timeout, TimeUnit unit)</strong>

Example

is:

Example

import java.util.concurrent.CompletableFuture;
import java.util.concurrent.TimeUnit;
public class CompleteOnTimeOutMethodTest {
   public static void main(String args[]) throws InterruptedException {
      int a = 10;
      int b = 15;
      <strong>CompletableFuture</strong>.supplyAsync(() -> {
         try {
            TimeUnit.SECONDS.sleep(5);
         } catch(InterruptedException e) {
            e.printStackTrace();
         }
         return a + b;
      })
      .<strong>completeOnTimeout</strong>(0, 4, TimeUnit.SECONDS)
      .<strong>thenAccept</strong>(result -> System.out.println(result));
      TimeUnit.SECONDS.sleep(10);
   }
}

Output

<strong>25</strong>

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