benbenab的专栏

每一个object都含有state和method，因此定义一个object的时候一定要说明他的含有什么data member，还有什么method。 多用design pattern，少用inheritance；using interfaces 1. 设计一个文本编辑器    a）composite pattern来分别管理只读文本和可读写文本    b）singl

Given two words word1 and word2, find the minimum number of steps required to convert word1 to word2. (each operation is counted as 1 step.) You have the following 3 operations permitted on a w

Answers write code in java /c for expression 5+4*(7-15) or have parenthesis in any order . idea: Use two stack, one for number, one for operator. Every time push a number or an operation into stack.