java 类型信息

package test;

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

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

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

public class SweetShop {
public static void main(String[] args) {    
 System.out.println("inside main");
 new Candy();
 System.out.println("After creating Candy");
 try {
   Class.forName("Gum");//返回的是一个Class对象的引用如果获取失败会抛出异常 ClassNotFoundException
 } catch(ClassNotFoundException e) {
   System.out.println("Couldn‘t find Gum");
 }
 System.out.println("After Class.forName(\"Gum\")");
 new Cookie();
 System.out.println("After creating Cookie");
}
} /* Output:
inside main
Loading Candy
After creating Candy
Loading Gum
After Class.forName("Gum")
Loading Cookie
After creating Cookie
*///:~
/* 注意新版本jdk和作者的结果不一样
 * inside main
Loading Candy
After creating Candy
Couldn‘t find Gum
After Class.forName("Gum")
Loading Cookie
After creating Cookie
*///~
 */