这是我在大学波尔多1类PROJET。我professieur Mr.Baudon创世这些代码给Java结构hashtree的例子。-this is a projet in my class in university bordeaux 1. My professieur Mr.Baudon creater these code for give a example of hashtree structure in java.

这是我在大学波尔多1类PROJET。我professieur Mr.Baudon创世这些代码给Java结构hashtree的例子。这是评估一个数值表达式，实现了类计算器。-This is to achieve a class calculator evaluating a numeric expression. Prefixed expressions are used to facilitate analysis: no priority no assoc