https://mp.weixin.qq.com/s/p3l9wr4DX976Lr62-dYe8w
java中==和equals和hashCode的区别
http://blog.csdn.net/dove_knowledge/article/details/71027170int、char、long各占多少字节数
http://blog.csdn.net/yushulinfengprc/article/details/70227156int与integer的区别
https://www.cnblogs.com/guodongdidi/p/6953217.html探探对java多态的理解
http://www.importnew.com/20079.htmlString、StringBuffer、StringBuilder区别
https://blog.csdn.net/rmn190/article/details/1492013什么是内部类？内部类的作用
https://blog.csdn.net/lianxu3344/article/details/79473607抽象类和接口区别
http://www.importnew.com/12399.html抽象类的意义
https://zhidao.baidu.com/question/199723919478667925.html抽象类与接口的应用场景
https://blog.csdn.net/xcbeyond/article/details/7667733抽象类是否可以没有方法和属性？
可以，是有抽象属性或者抽象方法的必须为抽象类，相反不一定接口的意义
https://blog.csdn.net/beiai1014/article/details/1561814泛型中extends和super的区别
https://www.cnblogs.com/yepei/p/6591289.html父类的静态方法能否被子类重写
https://blog.csdn.net/kdc18333608478/article/details/52040914进程和线程的区别
https://blog.csdn.net/zhou753099943/article/details/51771220final，finally，finalize的区别
https://blog.csdn.net/lx666lx/article/details/52505920序列化的方式
http://baijiahao.baidu.com/s?id=1568611161638053&wfr=spider&for=pc
