使用clone创建对象发现报了CloneNotSupportedException错误
首先找到错误的源头：
protected native Object clone() throws CloneNotSupportedException;看了一眼源码的注释，秒懂：
* @throws CloneNotSupportedException if the object's class does not * support the {@code Cloneable} interface. Subclasses * that override the {@code clone} method can also * throw this exception to indicate that an instance cannot * be cloned.翻译过来就是如果对象没有实现Cloneable接口，即使复写了clone方法还是会抛出CloneNotSupportedException异常，所以很简单，实现一下Cloneable接口就可以了
