函数

多元数组：

def main(args:Array[String]){

var triple = (100, "scala", "spark");

println(triple._1);

println(triple._2);

println(triple._3);

}

map：

def main(args:Array[String]) {

var ages = Map("rocky" -> 27, "Spark" -> 5)

for((k,v) <- ages) {

println("Key is " + k + ", value is " + v);

}

println("\n");

for((k,_) <- ages) {

println("key is " + k);

}

}

file:

def main(args : Array[String]) {

// var file = Source.fromFile("/Users/hujh/Documents/1.txt");

var file = Source.fromURL("http://www.baidu.com/");

for(line <- file.getLines()){

println(line);

}

}

Array:

def main(args:Array[String]) {

var array = Array(1,2,3,4,5);

for(i <- 0 until array.length) {

println(array(i));

}

for(elem <- array) {

println(elem);

}

}

package com.github.scala.hello

object funtion {

def main(args : Array[String]) {

// for( i <- 1 to 2; j <- 1 to 2) println( (i*100 +j) + " " )

// println;

//

// for( i <- 1 to 2; j <- 1 to 2 if i!=j) println( (i*100 +j) + " " )

// println;

// def addA(x : Int) = x + 100;

// def add = (x : Int) => x + 200;

// println( "addA(2) result:" + addA(2));

// println( " add(2) result:" + add(2));

// def fac(n:Int):Int = if(n<=0) 1 else n*fac(n-1);

// println(" the result is:" + fac(10));

// def combile(content:String, left:String = "[", right:String = "]") = left + content + right;

// println(combile("hello scala", "<<", ">>"));

def connected(args:Int*) = {

var result = 0;

for(arg <- args) result += arg;

result;

}

println("the result is " + connected(1,2,3,4,5));

}

}

lazy var file = Source.fromFile("d:\ddd.txt"); // 文件不存在

当有lazy时，执行该句是不报错，第一次真正使用时会报错，而没有lazy时，执行该句时报错。