CompletableFuture.anyOf()和CompletableFuture.anyOf()
时间: 2024-02-28 20:51:30 浏览: 31
CompletableFuture.anyOf()和CompletableFuture.allOf()都是Java中CompletableFuture类提供的方法,用于处理多个CompletableFuture对象的结果。
1. CompletableFuture.anyOf():
- CompletableFuture.anyOf()方法接收一个CompletableFuture数组作为参数,并返回一个新的CompletableFuture对象。
- 返回的CompletableFuture对象将在数组中的任意一个CompletableFuture对象完成时完成,并且其结果将是第一个完成的CompletableFuture对象的结果。
- 例如,如果有多个任务并行执行,我们可以使用CompletableFuture.anyOf()来等待任意一个任务完成并获取其结果。
2. CompletableFuture.allOf():
- CompletableFuture.allOf()方法接收一个CompletableFuture数组作为参数,并返回一个新的CompletableFuture对象。
- 返回的CompletableFuture对象将在数组中的所有CompletableFuture对象都完成时完成,但它本身不会返回任何结果。
- 例如,如果有多个任务并行执行,我们可以使用CompletableFuture.allOf()来等待所有任务完成。
相关问题
如果是数组的CompletableFuture,CompletableFuture.anyOf如何获取
CompletableFuture.anyOf方法可以用于获取多个CompletableFuture中最快完成的一个的结果。如果你有一个数组的CompletableFuture对象,你可以将它们作为参数传递给CompletableFuture.anyOf方法,然后使用get方法获取最快完成的CompletableFuture的结果。
下面是一个示例代码:
```java
CompletableFuture<String> future1 = CompletableFuture.supplyAsync(() -> "Result 1");
CompletableFuture<String> future2 = CompletableFuture.supplyAsync(() -> "Result 2");
CompletableFuture<String> future3 = CompletableFuture.supplyAsync(() -> "Result 3");
CompletableFuture<Object> anyFuture = CompletableFuture.anyOf(future1, future2, future3);
try {
Object result = anyFuture.get();
System.out.println("Fastest result: " + result);
} catch (InterruptedException | ExecutionException e) {
e.printStackTrace();
}
```
在这个例子中,我们创建了三个CompletableFuture对象,每个对象都返回一个字符串结果。然后,我们将这三个CompletableFuture对象作为参数传递给CompletableFuture.anyOf方法,并使用get方法获取最快完成的CompletableFuture的结果。最后,我们打印出最快结果。
CompletableFuture.supplyAsync
CompletableFuture.supplyAsync is a method in Java's CompletableFuture class that allows you to create a CompletableFuture with a supplier function. This method is typically used when you want to asynchronously execute a task and obtain its result. The supplier function is responsible for providing the result value.
Here's an example of how to use CompletableFuture.supplyAsync:
```java
CompletableFuture<String> future = CompletableFuture.supplyAsync(() -> {
// Perform some task to generate a result
return "Hello, world!";
});
// You can then use the CompletableFuture to perform other actions, such as applying transformations or handling the result
future.thenApply(result -> {
// Manipulate the result
return result.toUpperCase();
}).thenAccept(result -> {
// Consume the manipulated result
System.out.println(result);
});
```
In this example, the supplyAsync method is used to asynchronously execute a task that returns the string "Hello, world!". The thenApply method is then used to transform the result to uppercase, and finally, the thenAccept method is used to consume and print the manipulated result.
I hope this answers your question! Let me know if you have any more.