scala> def max(x:Int,y:Int):Int = { 
   |   if(x>y) x 
   |   else  y 
   | } 
max: (x: Int, y: Int)Int 
scala> max(1,2) 
res5: Int = 2 

scala> def helloworld()=println("HelloWorld") 
helloworld: ()Unit 

scala> var m =3 
m: Int = 3 

scala> while(m!=0){ 
   |  println(m) 
   |  m -= 1 
   | } 
3 
2 
1 

scala> var n =3 
n: Int = 3 

scala> do{ 
   |  println(n) 
   |  n -= 1 
   | }while(n!=0) 
3 
2 
1 

scala> for(i<- 1 to 3) 
   |   println(i) 
1 
2 
3 

scala> for(i<- 1 until 3) 
   |   println(i) 
1 
2 

scala> val a = "gyt" 
a: String = gyt 

scala> a match{ 
   |  case "gyt" => println("OK") 
   |  case "cyan" => println("no") 
   | } 
OK 

scala> if(true){ 
   |  println("throw new exception") 
   |  throw new IllegalArgumentException 
   | } 
throw new exception 
java.lang.IllegalArgumentException 
 ... 35 elided 

scala> try{  
   | val file = new FileReader("input.txt")  
   | }catch{  
   | case ex: FileNotFoundException => //handle missing file  
   | case ex: IOException => //handle other I/O error  
   | }finally{  
   | println("end") 
   | } 
end 

readscala> val name = readLine(“Your Name: \n”) 
warning: there was one deprecation warning; re-run with -deprecation for details 
Your Name: 
name: String = thinkgamer

scala> val abc = new Array[String](3) 
abc: Array[String] = Array(null, null, null) 
scala> abc(0)="thinkgamer" 
scala> abc(1)="cyan" 
scala> abc(2)="GQ" 
scala> for(i<- 0 to 2) 
   |  println(abc(i)) 
thinkgamer 
cyan 
GQ 

scala> val new_abc = new Array[String](3) 
new_abc: Array[String] = Array(null, null, null) 
scala> new_abc.update(0,"aaa") 
scala> new_abc.update(1,"bbb") 
scala> new_abc.update(2,"ccc") 
scala> for(i<- 0 to 2) 
   |  println(new_abc(i)) 
aaa 
bbb 
ccc 

scala> val abc = Array("thinkgamer","cyan","GQ") 
abc: Array[String] = Array(thinkgamer, cyan, GQ) 

数组的输出可以采用while或者foreach或者for进行输出
scala> val abc = Array("thinkgamer","cyan","GQ") 
abc: Array[String] = Array(thinkgamer, cyan, GQ) 
scala> var i = 0 
i: Int = 0 
scala> while(i<abc.length){ 
   |  println(abc(i)) 
   |  i+=1 
   | } 
thinkgamer 
cyan 
GQ 
scala> abc.foreach(str=>println(str)) 
thinkgamer 
cyan 
GQ 

scala> val one = List(1,2,3) 
one: List[Int] = List(1, 2, 3) 
scala> val two = List(4,5) 
two: List[Int] = List(4, 5) 
scala> val three = one:::two 
three: List[Int] = List(1, 2, 3, 4, 5) 

scala> val four = three::6::7::Nil 
four: List[Any] = List(List(1, 2, 3, 4, 5), 6, 7) 

scala> val five = 1::2::3::4::Nil 
five: List[Int] = List(1, 2, 3, 4) 

scala> val pair = (22,"one") 
pair: (Int, String) = (22,one) 
scala> println(pair._1) 
22 
scala> println(pair._2) 
one 

scala> var set = Set("a","b") 
set: scala.collection.immutable.Set[String] = Set(a, b) 
scala> set+="c" 
scala> set 
res8: scala.collection.immutable.Set[String] = Set(a, b, c) 
scala> println(set.contains("c")) 
true 

scala> val roman =Map(1->"I",2->"II") 
roman: scala.collection.immutable.Map[Int,String] = Map(1 -> I, 2 -> II) 
scala> println(roman(1)) 
I 
scala> println(roman(2)) 
II