lingedeng的专栏

//loop with for and foreach//-Xprint:parse/allval fruits = Array("apple", "banana", "orange")val upperF = for (fruit <- fruits) yield { val s = fruit.toUpperCase //println(s) s}printl

//primary constructorclass Person(var firstName: String, var lastName: String) { println("the constructor begins") //some class field private val HOME = System.getProperty("user.home")

//string compareval s1 = "Hello"val s2 = "h" + "ello"println("'" + s1 + "' equal to " + "'" + s2 + "' is " + (s1 == s2))println(s1.toUpperCase == s2.toUpperCase)println()//multiline stringval

//string to numberprintln("100".toInt)println("100".toFloat)//raise NumberFormatException//println("foo".toLong)object StringUtil { implicit class StringToInt(s: String) { def toInt(