java 进程 返回值

实现 Callable 接口

与 Runnable 相比，Callable 可以有返回值，返回值通过 FutureTask 进行封装。

public class MyCallable implements Callable {
    public Integer call() {
        return 123;
    }
}

public static void main(String[] args) throws ExecutionException, InterruptedException {
    MyCallable mc = new MyCallable();
    FutureTask ft = new FutureTask<>(mc);
    Thread thread = new Thread(ft);
    thread.start();
    System.out.println(ft.get());
}