Java语言中有关正则表达式的学习资料，比较基础。-Java language of regular expressions of the learning materials, basis of comparison.

一个古老的面向对象语言Smalltalk的学习资料-This book intends to teach you the basics of programming using GNU Smalltalk programming language. GNU Smalltalk is an implementation of the Smalltalk-80 programming language and Smalltalk family is in general a little b

详细讲述C++和Java两门语言之间的异同，是有语言基础的同学入门必备学习资料-Describe in detail the similarities and differences between the two languages ​ ​ of C++ and Java, students with language-based entry-essential learning materials