CompletableFuture.supplyAsync(()

`CompletableFuture.supplyAsync()` 是 Java 中 `java.util.concurrent.CompletableFuture` 类的一个静态方法，用于异步地提供某个计算结果。它接受一个函数作为参数，这个函数会在一个新的线程上执行，并将结果封装到一个新的完成任务（CompletableFuture）中。当函数执行完成后，你可以通过调用 `get()` 或者 `thenApply()` 等方法来获取计算结果。

使用示例：

CompletableFuture.supplyAsync(() -> {
    // 异步执行耗时操作
    int result = expensiveComputation();
    return result;
}).thenAccept(result -> {
    // 主线程处理计算结果
    System.out.println("Result is: " + result);
});

在这个例子中，`expensiveComputation()` 是一个可能需要花费时间执行的操作，它不会阻塞主线程。当你调用 `supplyAsync()` 并传递该函数后，`result` 就会被异步计算出来。

相关问题

CompletableFuture .supplyAsync

这是一个Java中的类，用于异步执行任务，并在任务完成后返回一个结果。它可以用于在后台执行长时间运行的操作，而不会阻止主线程。例如，在读取网络资源或执行计算密集型任务时，可以使用CompletableFuture类，以便应用程序继续响应用户输入。

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:

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.