thinking in java一个示例程序运行出错，无法找到原因啊

thinking in java一个示例程序运行出错，无法找到原因啊。。。求助
package typeinfo;
import java.util.*;

class Initable {
  static final int staticFinal = 47;
  static final int staticFinal2 =
  ClassInitialization.rand.nextInt(1000);
  static {
  System.out.println("Initializing Initable");
  }
}

class Initable2 {
  static int staticNonFinal = 147;
  static {
  System.out.println("Initializing Initable2");
  }
}

class Initable3 {
  static int staticNonFinal = 74;
  static {
  System.out.println("Initializing Initable3");
  }
}

public class ClassInitialization {
  public static Random rand = new Random(47);
  public static void main(String[] args) throws Exception {
  Class initable = Initable.class;
  System.out.println("After creating Initable ref");
  // Does not trigger initialization:
  System.out.println(Initable.staticFinal);
  // Does trigger initialization:
  System.out.println(Initable.staticFinal2);
  // Does trigger initialization:
  System.out.println(Initable2.staticNonFinal);
  Class initable3 = Class.forName("Initable3");
  System.out.println("After creating Initable3 ref");
  System.out.println(Initable3.staticNonFinal);
  }
} 

理论上的输出结果如下：
After creating Initable ref
47
Initializing Initable
258
Initializing Initable2
147
Initializing Initable3
After creating Initable3 ref
74

而实际输出结果是：
After creating Initable ref
47
Initializing Initable
258
Initializing Initable2
147
Exception in thread "main" java.lang.ClassNotFoundException: Initable3
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:186)
at typeinfo.ClassInitialization.main(ClassInitialization.java:38)

如果main方法不用 throws Exception。。而改为把Class initable3 = Class.forName("Initable3");写成try catch..

则输出如下：
After creating Initable ref
47
Initializing Initable
258
Initializing Initable2
147
java.lang.ClassNotFoundException: Initable3
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:186)
at typeinfo.ClassInitialization.main(ClassInitialization.java:39)
After creating Initable3 ref
Initializing Initable3
74


跑出的异常时说，找不到Initable3，我理解为是木有初始化。。。但书上却说Class.forName()调用即会立马初始化。。。

------解决方案--------------------------------------------------------
Class initable3 = Class.forName("Initable3");
改成
Class.forName("typeinfo.Initable3");//完全限定名