如何在停止程序之前等待命令完成執行？

Question

這是我的代碼：

import java.io.File;
import jaco.mp3.player.MP3Player;

class SimpleAudioPlayer {

    public static void main(String[] args) {

        File audio_file = new File("Clarx - H.A.Y.mp3");
        MP3Player music_player = new MP3Player();
        music_player.addToPlayList(audio_file);
        music_player.play();
        // wait for music_player.play() to finish executing
    }
}

我想創建一個 mp3 播放器並找到了這個 Project ，代碼片段所做的是創建一個新的 MP3Player object，創建一個新文件，並將其添加到播放列表中。 之后，它才開始播放歌曲。 但問題是它在程序停止執行之前只播放了大約一兩秒的文件。 如何等到 play() function 停止執行？

答：感謝 giraycoskun ！

import java.io.File;
import jaco.mp3.player.MP3Player;
import java.util.concurrent.*;

class SimpleAudioPlayer {

    public static void main(String[] args) {

        File audio_file = new File("Clarx - H.A.Y.mp3");
        MP3Player music_player = new MP3Player();
        music_player.addToPlayList(audio_file);
        ExecutorService threadpool = Executors.newCachedThreadPool();
        Future<Long> futureTask;
        futureTask = (Future<Long>) threadpool.submit(music_player::play);
        // Simple variable to check hpw often the folowing loop gets executed
        int n = 0;
        while (!futureTask.isDone()) {
            System.out.println("Executing" + n);
            n++;
        }
    }
}

我不得不對他提交的答案做一些小改動，但效果很好，非常感謝！

Answer 1

我還沒有在我的計算機上嘗試過代碼，但是這些可以提供幫助：

https://docs.oracle.com/javase/8/docs/api/?java/util/concurrent/package-summary.html

https://www.baeldung.com/java-asynchronous-programming

import java.io.File;
import jaco.mp3.player.MP3Player;
import java.util.concurrent;

class SimpleAudioPlayer {

    public static void main(String[] args) {

        File audio_file = new File("Clarx - H.A.Y.mp3");
        MP3Player music_player = new MP3Player();
        music_player.addToPlayList(audio_file);
        ExecutorService threadpool = Executors.newCachedThreadPool();
        Future<Long> futureTask = threadpool.submit(() -> music_player.play());
        while (!futureTask.isDone()) {
            // wait for music_player.play() to finish executing
            System.out.println("FutureTask is not finished yet..."); 
        } 
        
        
    }
}