以下是Java操作Windows系统功能的几个案例：

1. 打开系统默认浏览器：

Desktop.getDesktop().browse(URI.create("http://www.google.com"));

1. 打开文件夹：

FileManager fileManager = new FileManager();
fileManager.openFolder("C:\\Users");

public class FileManager {public void openFolder(String path) {try {Runtime.getRuntime().exec("explorer.exe /select,"+path);} catch (IOException e) {e.printStackTrace();}}
}

1. 播放音频：

MediaPlayer mediaPlayer = new MediaPlayer(new Media(new File("E:/music.mp3").toURI().toString()));
mediaPlayer.play();

public class MediaPlayer {private final Media media;private final javafx.scene.media.MediaPlayer player;public MediaPlayer(Media media) {this.media = media;player = new javafx.scene.media.MediaPlayer(media);}public void play() {player.play();}public void pause() {player.pause();}public void stop() {player.stop();}
}

1. 打开命令行并执行命令：

CMD.execute("cmd /c dir");

public class CMD {public static void execute(String command) {try {Process process = Runtime.getRuntime().exec(command);BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));String line;while ((line = reader.readLine()) != null) {System.out.println(line);}reader.close();} catch (IOException e) {e.printStackTrace();}}
}