public class OfficeBetter {

 public static void main(String[] args) throws InstantiationException, IllegalAccessException {
  try {
   //动态加载类，在运行时刻加载
   Class c =Class.forName(args[0]);
   //通过类类型，创建该类对象
   OfficeAble oa =(OfficeAble)c.newInstance();
   oa.start();
  } catch (ClassNotFoundException e) {
   e.printStackTrace();
  }
  
 } 

}

 public interface OfficeAble {
  public void start();
 } 

public class Word implements OfficeAble{

 public void start() {
  System.out.println("word....starts...");
 }
 
}