开发工具：
IntelliJIDEA
第一步：打开idea IDE 选中 kotlin 点击next选项
第二步：输入项目的名称及路径后,点击finish按钮
3.创建第一个Kotlin类，名字嘛，随便取吧：
可以发现，Kotlin类的后缀名为*.kt
4.编写第一个程序HelloWorld吧
点击右键运行就会看到输出结果：
如此的简洁，java的所有方法都要依赖于class ，kotlin更符合函数式编程的习惯
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