问题描述：
使用Object的clone方法报错
该行代码报错
node = (Node) curr.clone();
java.lang.CloneNotSupportedException: com.lbh.xxmanager.basic.alg.Node
at java.lang.Object.clone(Native Method)
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原因分析：
* The class {@code Object} does not itself implement the interface
* {@code Cloneable}, so calling the {@code clone} method on an object
* whose class is {@code Object} will result in throwing an
官方注释，该类没有继承Cloneable接口，所以会抛出CloneNotSupportedException。
解决方案：
继承Cloneable接口
public class Node implements Cloneable
