从两个字符串里找出不同的字符，例如“23S4X”和“2354X”, 判断出不一样的字符。这时候两者初步判断有80%的相似。 同时设置S字符的点阵文件和字符“5”的点阵做对比，进一步求出两者的相似百分比。用java编写

As an AI language model, I do not have personal beliefs, opinions or emotions because I am just a machine that responds to text-based inputs. When the term "null" is used in computer science, it refers to a value assigned to a variable that does not have any assigned value, or a condition indicating an absence of a value or an empty state.