1 下载IDEA以及scala sdk

http://www.jetbrains.com/idea/download/download-thanks.html?code=IIC

http://www.scala-lang.org/download/

2 DEA安装scala插件

file->settings->plugins

输入scala，然后点击install

完成后重启IDEA

新建scala工程，选择scala sdk位置

3 helloworld代码

进入主界面后，新建scala文件hello，文件类型选择object

object @H_403_24@hello {
  def @H_403_24@main(args: Array[String@H_403_24@]): Unit = {
    say_hello@H_403_24@()
  }
  def @H_403_24@say_hello(): Unit ={
    println@H_403_24@("hello"@H_403_24@)
  }
}