java.util.HashMap.keySetのサンプル
サンプルコード
package com.arkgame; import java.util.HashMap; public class HashMapDemo { public static void main(String[] args) { // Creating an empty HashMap HashMap<String, Integer> cftMap = new HashMap<String, Integer>(); // Mapping int values to string keys cftMap.put("aa", 8); cftMap.put("4", 10); cftMap.put("cc", 15); cftMap.put("dd", 20); cftMap.put("ee", 25); // Displaying the HashMap System.out.println("Initial Mappings: " + cftMap); // Using keySet() to get the set view of keys System.out.println(" set is: " + cftMap.keySet()); } }
結果
Initial Mappings: {aa=8, cc=15, dd=20, ee=25, 4=10}
set is: [aa, cc, dd, ee, 4]