原来反射机制这么用！

Java中每个类都都可以通过Class.for("")获取，然后就可以根据需要创建对应的类对象或者类的父类对象等等。

Java反射机制代码示例如下：

class Candy {
    static {System.out.println("Loading candy");}
}

class Gumm {
    static {System.out.println("Loading gumm");}
    public String toString() {
	return "Gumm information";
    }
}

class Gum extends Gumm {
    static {System.out.println("Loading gum");}
    public String toString() {
	return "Gum information";
    }
}

class Cookie {
    static {System.out.println("Loading cookie");}
    
}

public class SweetShop {
    public static void main(String[] args) throws InstantiationException, IllegalAccessException {
	System.out.println("Inside main");
	new Candy();
	System.out.println("After creating candy");
	try {
	    Class<?> cc = Class.forName("regex.Gum");
	    System.out.println(cc.getName());
	    System.out.println(cc.getCanonicalName());
	    System.out.println(cc.toString());
	    Gum g = (Gum) cc.newInstance();
	    System.out.println(g.toString());
	    
	    Class<?> superclass = cc.getSuperclass();
	    System.out.println(superclass.getName());
	    Object newInstance = superclass.newInstance();
	    System.out.println(newInstance.toString());
	    
	    
	    
	    
	} catch (ClassNotFoundException e) {
	    // TODO Auto-generated catch block
	    e.printStackTrace();
	}
	System.out.println("After creating gum");
	new Cookie();
	System.out.println("After creating cookie");
    }
}