node.java

是算术表达的计算

public class Node
{
	double data;
	Node next;
	public Node(double da)
	{
		data=da;
		next=null;
	}
	public Node(double da,Node ne)
	{
		data=da;
		next=ne;
	}	
	double getData()
	{
		return this.data;
	}
}