Java反射之静态加载和动态加载的简单实例

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();
		}
	}

}