package com.imooc.加载类;

public class Office_Static {
 public static void main(String[] args) {
  //new 创建对象，是静态加载类，在编译时刻就需要加载所有的可能使用到的类
  if("Word".equals(args[0])){
   Word w = new Word();
   w.start();
  }
  if("Excel".equals(args[0])){
   Excel e = new Excel();
   e.start();
  }
 }
}

package com.imooc.加载类;

public interface OfficeAble {
 public void start();
}

package com.imooc.加载类;

public class Word implements OfficeAble{
 public void start(){
  System.out.println("word start");
 }

}

package com.imooc.加载类;

public class Excel implements OfficeAble{

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

package com.imooc.加载类;

public class OfficeBetter {
 /**
  * @param args
  */
 public static void main(String[] args) {
  try {
   //动态加载类，在运行时刻加载
   Class c = Class.forName(args[0]);//在运行配置里面输入com.imooc.加载类.Excel
   //通过类类型，创建该类对象(先转换为Word和Excel的共同接口OfficeAble)
   OfficeAble oa = (OfficeAble)c.newInstance();
   oa.start();
   
   //不推荐下面两种，因为不确定是加载Word还是Excel，要强转
//   Word word = (Word)c.newInstance();
//   word.start();
//   Excel excel = (Excel)c.newInstance();
//   excel.start();
  } catch (Exception e) {
   e.printStackTrace();
  }
 }

}