After creating Initable ref 47

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);
  }
}

运行结果报错：After creating Initable ref
47
Initializing Initable
258
Initializing Initable2
147
Exception in thread "main" java.lang.ClassNotFoundException: Initable3
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要加上包名：
package com.withiter.csdn.test;
 
import java.util.Random;