Gradle is the kind of drop-in build script that I like: for simple, standard projects it allows you to use itself with just a few lines of configuration.
Gradle是一种我所喜欢的构建脚本：如果是简单、标准的项目你只需要几行配置就可以搞定。
2
Lines 01 to 05 normalize the input to capital letters and drop all other characters.
行01到05对输入进行规范化，把输入变成大写字母，去掉其他字符。
3
The first few lines retrieve the values from the drop-down list boxes in which the user selects usage and configuration, respectively.