JAVA学习知识杂烩 idea快捷键使用:https://blog.csdn.net/youanyyou/article/details/97072410 int值类型与引用类型比较的坑:https://www.cnblogs.com/zhh19981104/p/12036420.html 泛型与类型擦除:https://blog.csdn.net/qq_36761831/article/details/82289786