This repository contains java practice problem on Exception handling, String, StringBuilder, StringBuffer, Wrapper classes, MultiThreading, Generics, Generic Mehtods, Collection, ArrayList, and ...

问题描述 Caused by: java.lang.ClassCastException: class java.util.HashSet cannot be cast to class java.util.List (java.util.HashSet and java.util.List are in module java.base of loader 'bootstrap') at ...