「Java」多次元配列の長さを取得するサンプル
書式
配列変数名.length
Javaコード
package com.example; public class NijikenArr { public static void main(String[] args) { int aa[][] ={ {18,12,21}, {21,22,23} }; String [][] data = { {"AGE","18","年齢"}, {"ADDRESS","tokyo","東京"}, {"USERNAME","yamada","山田"} }; System.out.println("実行結果:"); System.out.println("長さ1: "+ aa.length + "\n長さ2: "+ data.length); } }
実行結果:
長さ1: 2
長さ2: 3