7. 多次元配列

多次元配列の作成

lesson 017

class Lesson017 {
    public static void main(String args[]) {
        int ary[][] = new int[2][3];
        ary[0][0] = 10;
        ary[0][1] = 20;
        ary[0][2] = 30;
        ary[1][0] = 40;
        ary[1][1] = 50;
        ary[1][2] = 60;

        System.out.println("配列0,xの和 = " + (ary[0][0] + ary[0][1] + ary[0][2]));
        System.out.println("配列1,xの和 = " + (ary[1][0] + ary[1][1] + ary[1][2]));
    }
}

実行結果



L:\>java Lesson017

配列0,xの和 = 60

配列1,xの和 = 150

多次元配列の初期化

lesson 018

class Lesson018 {
    public static void main(String args[]) {
        int ary[][] = { {10,20} , {30,40} , {50 , 60} };

        System.out.println(ary[0][0]);
        System.out.println(ary[0][1]);
        System.out.println(ary[1][0]);
        System.out.println(ary[1][1]);
        System.out.println(ary[2][0]);
        System.out.println(ary[2][1]);
    }
}

実行結果



L:\>java Lesson018

10

20

30

40

50

60

多次元配列の要素数

lesson 019

class Lesson019 {
    public static void main(String args[]) {
        int ary[][] = { {10} , {30,40} , {50 , 60 , 70 , 80} };

        System.out.println("aryの要素数 = " + ary.length);
        System.out.println("ary[0]の要素数 = " + ary[0].length);
        System.out.println("ary[1]の要素数 = " + ary[1].length);
        System.out.println("ary[2]の要素数 = " + ary[2].length);
    }
}

実行結果



L:\>java Lesson019

aryの要素数 = 3

ary[0]の要素数 = 1

ary[1]の要素数 = 2

ary[2]の要素数 = 4