package com.ioc;public class Test {  public static void main(String[] args) throws ClassNotFoundException {
    System.out.println(Test.class.getClassLoader());
    System.out.println(ClassLoader.getSystemClassLoader());
    System.out.println(ClassLoader.getSystemClassLoader());
    System.out.println(Thread.currentThread().getContextClassLoader());
    //System.out.println(Test.class.getClassLoader().loadClass("com.ioc.Test2"));//没有初始化
    //System.out.println(Class.forName("com.ioc.Test2"));//开始初始化
    System.out.println(Class.forName("com.ioc.Test2", false, ClassLoader.getSystemClassLoader()));//没有初始化
  }
}

package com.ioc;public class Test2 {  static{
    System.out.println("开始初始化");  }}

深入理解ClassLoader工作机制（jdk1.8）

https://blog.csdn.net/u014634338/article/details/81434327

五分钟看懂ClassLoader

https://www.jianshu.com/p/554c138ca0f5

JVM类加载的过程（加载、验证、准备、解析、初始化）

https://blog.csdn.net/sunroyfcb/article/details/81591784

类加载的过程（加载、验证、准备、解析、初始化）

https://blog.csdn.net/dufufd/article/details/80538527