静态加载:
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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();
}
}
}
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这个程序编译时必须有Word和Excel这两个类存在才行,即使判断后用不到Excel也要加载
动态加载:
1、接口OfficeAble :
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package com.imooc.加载类;
public interface OfficeAble {
public void start();
}
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2、Word实现接口:
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package com.imooc.加载类;
public class Word implements OfficeAble{
public void start(){
System.out.println( "word start" );
}
}
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3、Excel实现接口:
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package com.imooc.加载类;
public class Excel implements OfficeAble{
public void start(){
System.out.println( "excel start" );
}
}
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4、Main方法
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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();
}
}
}
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以上就是小编为大家带来的Java反射之静态加载和动态加载的简单实例的全部内容了,希望对大家有所帮助,多多支持服务器之家~