notyy

scala> val source ="access_token=C4F0730***********485824&expires_in=7776000"
source: java.lang.String = access_token=C4F0730***********485824&expires_in=7776000

scala> val (accToken, expire) = (source.split('&')(0).split('=')(1), source.split('&')(1).split('=')(1))
accToken: String = C4F0730***********485824
expire: String = 7776000

notyy

def myFunc() = {
  val rs = calcSomeResult()
  logger.info("result is:" + rs)
  rs
}
为避免上面的麻烦写法:

object LogUtil {
  def kestrel[A](x: A)(f: A => Unit): A = { f(x); x }
  def logV[A](f: String => Unit)(s: String, x: A) = kestrel(x) { y => f(s + ": " + y) }

notyy

def perm[T](ls: List[T]): List[List[T]] = ls match {  
  case Nil => List[Nil]
  case xs  => for{
    (x,i) <- ls.zipWithIndex
    (leftX,rightX) = xs.splitAt(i)
    ys <- perm(leftX ++ rightX.tail)
  } yield (x:: ys)
} 

notyy

本程序逻辑如下:
1、列出当前目录下所有后缀名为srt的文件，过滤掉其中文件名以-3D结尾的文件
2、对每个符合条件1的文件，读取其内容，通过在字幕内容中加入坐标偏移量，使之能在左右屏的3D电视上正常播放
3、srt文件格式
   1、文件由多个段落组成，段落之间以空行分隔
   2、每段落中的内容由3部分组成
       1、序号
       2、时间量
       3、字幕内容
4、转换逻辑是将原字幕内容分别在前面加上偏移量{\pos(96,255)\fscx50}和{\pos(288,255)\fscx50}，变成两段内容，一个序号保持不变，位置也不变，而另一段必须加到原内容最后，序号递增

notyy

def showType: Any => String = {
  case s:String => "it's a String:" + s
  case i:Int => "it's a Int:" + i 
  case l:List[Any] => "it's a List,length: " + l.length
  case _ => "I don't know"
}

def showTypeM(t:Any):String = t match {
  case s:String => "it's a String:" + s
  case i:Int => "it's a Int:" + i

notyy

def m2(x:Int) = x * 2
def p1(x:Int) = x + 1

scala> (1 to 5).map(m2).map(p1)
res3: scala.collection.immutable.IndexedSeq[Int] = Vector(3, 5, 7, 9, 11)

scala> (1 to 5).map(m2 _ andThen p1)
res9: scala.collection.immutable.IndexedSeq[Int] = Vector(3, 5, 7, 9, 11)

notyy

class Fruit {
  def selfIntro() = "Fruit"
}

class Apple extends Fruit{
  override def selfIntro() = "Apple"
}

class Package[T] (val contents:Seq[T]) {
  def this() = this(List[T]())

notyy

Object s = "abc";
List<Object> objects = new java.util.ArrayList<String>();


String[] a = new String[] { "abc" };
Object[] b = a;
b[0] = 1;
System.out.println(a[0]);

notyy

class Father {
  def say() {
    Console.println("I am father")
  }
}

class Son extends Father {
  override def say() {
    Console.println("I am son")
  }

notyy

object Main extends App {
  object SearchCodeEnum extends Enumeration {
    type SearchCodeValue = Value
    val org = Value
    val file = Value
  }

  for(code <- SearchCodeEnum.values) {println(code)}

}