stacknode.java

进行四则运算"+-*/^ ",并可以处理简单变量"AB",并且具备可扩展性.

public class StackNode<T>{   
    public StackNode<T> link;   
    public T info;   
    public class NumberNode{
    	
    }
    public class OperatorNode{
    	
    }
    public class VariableNode{
    	
    }
    public class FunctionNode{
    	
    }
}