Gpwner的博客

新建一个Maven项目，开开心心地写完scala程序，在本地调试没什么问题，要打包部署在spark集群上运行的时候却出错了，说找不到主类java.lang.ClassNotFoundException: neu.WordCount at java.net.URLClassLoader.findClass(URLClassLoader.java:381) at java

下面的代码是产生1-35范围内的整数 while (true) { var a = 1 + (new Random).nextInt((35 - 1) + 1) if (a <= 0 || a >= 36) print(a) } (new Random).nextInt（n）会产生一个大于等于0且小于n的整数

object Demo { def time[R](block: => R): R = { val start = System.nanoTime() val result = block // call-by-name val end = System.nanoTime() println("\n\n-------------------------------

今天在拆分以下数据集的时候area,perimeter,compactness,lengthOfKernel,widthOfKernel,asymmetryCoefficient,lengthOfKernelGroove15.26,14.84,0.871,5.763,3.312,2.221,5.2214.88,14.57,0.8811,5.554,3.333,1.018,4.95614.29,

1.只是一个快捷方式首先定义个object:object Greet { def apply(name: String): Unit = { println("Call From %s".format(name)) }}object Main { def main(args: Array[String]): Unit = { Greet.apply("Gpwner")