completablefuture.supplyasync
时间: 2023-04-30 18:03:25 浏览: 50
CompletableFuture.supplyAsync() 方法可以在线程池中异步执行一个任务,并返回 CompletableFuture 对象。这个对象可以用来获取任务的结果,或者在任务完成后进行额外的操作。
相关问题
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.
CompletableFuture.supplyAsync()
CompletableFuture.supplyAsync()是一个静态方法,用于创建一个异步操作,并返回一个CompletableFuture对象。它接受一个Supplier函数作为参数,该函数可以提供一个结果值。CompletableFuture.supplyAsync()方法会在一个默认的线程池中执行该Supplier函数,并返回一个CompletableFuture对象,该对象最终会包含该函数的结果值。
以下是一个示例代码,演示了CompletableFuture.supplyAsync()的用法:
```java
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;
import java.util.function.Supplier;
public class CompletableFutureExample {
public static void main(String[] args) throws ExecutionException, InterruptedException {
// 创建一个Supplier函数,用于提供一个结果值
Supplier<String> supplier = () -> {
System.out.println("supplier");
return "supplier";
};
// 使用CompletableFuture.supplyAsync()创建一个异步操作
CompletableFuture<String> future = CompletableFuture.supplyAsync(supplier);
// 获取异步操作的结果值
String result = future.get();
System.out.println("future=" + result);
}
}
```
输出结果为:
```
supplier
future=supplier
```