leetcode-go/basis/concurrent/TestCallable.java

import java.util.concurrent.*;

public class TestCallable {
    public static void main(String[] args) throws Exception {
        MyCallable callable = new MyCallable();
        FutureTask<String> future = new FutureTask<>(callable);
        Thread thread = new Thread(future);
        thread.start();
        System.out.println(future.get());
    }
}

class MyCallable implements Callable<String> {
    @Override
    public String call() {
        try {
            Thread.sleep(1000);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "Finished.";
    }
}