UnstableElement的专栏

    抽象类与接口的区别（英文描述）：     Interface is open to the public, there can not have the private methods and variables.It is used to let others use, but the abstract class can have private  methods or privat...

来谈谈protected访问权限问题。看下面示例1： class MyObject {} public class Test { public static void main(String[] args) { MyObject obj = new MyObject(); obj.clone(); // Compile error. }}   ...