KotlinでAndroidアプリ#List

        val list: List<Int>
        list = listOf(1, 2, 3)
        list.forEachIndexed { index, element ->
            Log.d("MainActivity","list["+index+"]="+element)
        }

        val mutableList: MutableList<Int>
        mutableList = mutableListOf(1, 2 ,3)
        mutableList.forEachIndexed { index, element ->
            Log.d("MainActivity","mutableList["+index+"]="+element)
        }

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val list: List<Int>

list = listOf(1, 2, 3)

list.forEachIndexed { index, element ->

Log.d("MainActivity","list["+index+"]="+element)

}

val mutableList: MutableList<Int>

mutableList = mutableListOf(1, 2 ,3)

mutableList.forEachIndexed { index, element ->

Log.d("MainActivity","mutableList["+index+"]="+element)

}

D/MainActivity: list[0]=1
D/MainActivity: list[1]=2
D/MainActivity: list[2]=3
D/MainActivity: mutableList[0]=1
D/MainActivity: mutableList[1]=2
D/MainActivity: mutableList[2]=3

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D/MainActivity: list[0]=1

D/MainActivity: list[1]=2

D/MainActivity: list[2]=3

D/MainActivity: mutableList[0]=1

D/MainActivity: mutableList[1]=2

D/MainActivity: mutableList[2]=3

        val list: List<Int>
        list = listOf(1, 2, 3)
        //list.add(3)           //エラー
        //list.set(0,9)         //エラー
        list.forEachIndexed { index, element ->
            Log.d("MainActivity","list["+index+"]="+element)
        }

        val mutableList: MutableList<Int>
        mutableList = mutableListOf(1, 2 ,3)
        mutableList.add(4)
        mutableList.set(0,9)
        mutableList.forEachIndexed { index, element ->
            Log.d("MainActivity","mutableList["+index+"]="+element)
        }

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val list: List<Int>

list = listOf(1, 2, 3)

//list.add(3) //エラー

//list.set(0,9) //エラー

list.forEachIndexed { index, element ->

Log.d("MainActivity","list["+index+"]="+element)

}

val mutableList: MutableList<Int>

mutableList = mutableListOf(1, 2 ,3)

mutableList.add(4)

mutableList.set(0,9)

mutableList.forEachIndexed { index, element ->

Log.d("MainActivity","mutableList["+index+"]="+element)

}

D/MainActivity: list[0]=1
D/MainActivity: list[1]=2
D/MainActivity: list[2]=3
D/MainActivity: mutableList[0]=9
D/MainActivity: mutableList[1]=2
D/MainActivity: mutableList[2]=3
D/MainActivity: mutableList[3]=4

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D/MainActivity: list[0]=1

D/MainActivity: list[1]=2

D/MainActivity: list[2]=3

D/MainActivity: mutableList[0]=9

D/MainActivity: mutableList[1]=2

D/MainActivity: mutableList[2]=3

D/MainActivity: mutableList[3]=4

        val mutableList: MutableList<Int>
        mutableList = mutableListOf(1, 2 ,3)
        Log.d("MainActivity","2番目"+mutableList.get(1)+":"+mutableList[1])

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val mutableList: MutableList<Int>

mutableList = mutableListOf(1, 2 ,3)

Log.d("MainActivity","2番目"+mutableList.get(1)+":"+mutableList[1])

D/MainActivity: 2番目2:2

1	D/MainActivity: 2番目2:2

        var list: MutableList<MutableList<String>> = mutableListOf()

        var list1 = mutableListOf("abc", "def", "ghi")
        var list2 = mutableListOf("jkl", "opq", "rstu")
        var list3 = mutableListOf("vwx", "yz!", "!#$")

        list.add(list1)
        list.add(list2)
        list.add(list3)

        list.forEachIndexed { index, element ->
            element.forEachIndexed { index2, element2 ->
                Log.d("MainActivity","list["+index+"]["+index2+"]="+element2)
            }
        }

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var list: MutableList<MutableList<String>> = mutableListOf()

var list1 = mutableListOf("abc", "def", "ghi")

var list2 = mutableListOf("jkl", "opq", "rstu")

var list3 = mutableListOf("vwx", "yz!", "!#$")

list.add(list1)

list.add(list2)

list.add(list3)

list.forEachIndexed { index, element ->

element.forEachIndexed { index2, element2 ->

Log.d("MainActivity","list["+index+"]["+index2+"]="+element2)

}

D/MainActivity: list[0][0]=abc
D/MainActivity: list[0][1]=def
D/MainActivity: list[0][2]=ghi
D/MainActivity: list[1][0]=jkl
D/MainActivity: list[1][1]=opq
D/MainActivity: list[1][2]=rstu
D/MainActivity: list[2][0]=vwx
D/MainActivity: list[2][1]=yz!
D/MainActivity: list[2][2]=!#$

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D/MainActivity: list[0][0]=abc

D/MainActivity: list[0][1]=def

D/MainActivity: list[0][2]=ghi

D/MainActivity: list[1][0]=jkl

D/MainActivity: list[1][1]=opq

D/MainActivity: list[1][2]=rstu

D/MainActivity: list[2][0]=vwx

D/MainActivity: list[2][1]=yz!

D/MainActivity: list[2][2]=!#$

KotlinでAndroidアプリ#List

定義/初期値

追加、変更

アクセス

二次元配列