如何查看Java程序运行时类加载的信息?

-XX:+TraceClassLoading参数可以记录ClassLoader加载类的详细信息。

java -XX:+TraceClassLoading Demo

• [Opened D:\Java\jre1.8.0_301\lib\rt.jar]
  [Loaded java.lang.Object from D:\Java\jre1.8.0_301\lib\rt.jar]
  [Loaded java.io.Serializable from D:\Java\jre1.8.0_301\lib\rt.jar]
  [Loaded java.lang.Comparable from D:\Java\jre1.8.0_301\lib\rt.jar]
  ......
  [Loaded Demo from file:/F:/java_test/]