一、命令行解析 https://blog.csdn.net/oBuShanQing/article/details/86748895
二、类加载之class文件读取 https://blog.csdn.net/oBuShanQing/article/details/86751937
三、类加载之class文件解析 https://blog.csdn.net/oBuShanQing/article/details/100072652
四、类加载之准备阶段 https://blog.csdn.net/oBuShanQing/article/details/100169660