如何在Java中执行外部程序，例如Windows Media Player？

import java.io.IOException;
public class Trail {
   public static void main(String args[]) throws IOException {
      Runtime run = Runtime.getRuntime();
      System.out.println("Executing the external program . . . . . . . .");
      String file = "C:\Program Files\Windows Media Player\wmplayer.exe";
      run.exec(file);
   }
}

System.out.println("Executing the external program . . . . . . . .

import java.io.IOException;
public class ExternalProcess {
   public static void main(String args[]) throws IOException {
      String command = "C:\Program Files\Windows Media Player\wmplayer.exe";
      String arg = "D:\sample.mp3";
      //Building a process
      ProcessBuilder builder = new ProcessBuilder(command, arg);
      System.out.println("Executing the external program . . . . . . . .");
      //Starting the process
      builder.start();
   }
}

Executing the external program . . . . . . . .