Java 9中的orTimeout()和completeOnTimeOut()方法之间的区别？
既orTimeout()和completeOnTimeOut()方法在定义CompletableFuture 类和这两种方法都用Java9.引入orTimeout()方法可用于指定，如果一个给定的任务并不一定的时间周期内完成，程序停止执行并引发TimeoutException， 而completeOnTimeOut()方法使用提供的值完成CompletableFuture 。如果不是，则在给定超时之前完成。
的语法orTimeout()
public CompletableFuture<T> orTimeout(long timeout, TimeUnit unit)
示例
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;
CompletableFuture.supplyAsync(() -> {
try {
TimeUnit.SECONDS.sleep(5);
} catch(InterruptedException e) {
e.printStackTrace();
}
return a + b;
})
.orTimeout(4, TimeUnit.SECONDS)
.whenComplete((result, exception) -> {
System.out.println(result);
if(exception != null)
exception.printStackTrace();
});
TimeUnit.SECONDS.sleep(10);
}
}输出结果
25
的语法completeOnTimeOut()
public CompletableFuture<T> completeOnTimeout(T value, long timeout, TimeUnit unit)
示例
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;
CompletableFuture.supplyAsync(() -> {
try {
TimeUnit.SECONDS.sleep(5);
} catch(InterruptedException e) {
e.printStackTrace();
}
return a + b;
})
.completeOnTimeout(0, 4, TimeUnit.SECONDS)
.thenAccept(result -> System.out.println(result));
TimeUnit.SECONDS.sleep(10);
}
}输出结果
25