Kotlin的list

list

fun main(args:Array<String>){
    var lists= listOf<String>("雞蛋","大米","冰淇淋")    //創建list集合
    for(list in lists){                                 //遍歷
      println(list)
    }
}

fun main(args:Array<String>){
    var lists= listOf<String>("雞蛋","大米","冰淇淋") 
 for(list in lists.withIndex()){ //帶下標遍歷
 println(list)
 }
}

//輸出的結果

IndexedValue(index=0, value=雞蛋)
IndexedValue(index=1, value=大米)
IndexedValue(index=2, value=冰淇淋)

fun main(args:Array<String>){
    var lists= listOf<String>("雞蛋","大米","冰淇淋")
 for((i,e) in lists.withIndex()){ //將下標和值一起打印
 println( "$i $e")
 }
}

//輸出結果
0 雞蛋
1 大米
2 冰淇淋

map

fun main(args:Array<String>){
  var map=TreeMap<String,String>()
    map["1"]="good"
    map["2"]="day"
    map["3"]="yes"
    map["4"]="no"
    println(map["1"])
}