[자바] 자바 Map 사용 예제

import java.util.HashMap; public class Main {        public static void main(String[] args) {              /* Map */        HashMap<String, Integer> map = new HashMap<String, Integer>();        // HashMap<String, int> map = new HashMap<String, int >(); // Error        map.put("one" , 1);        map.put("two" , 2);        System. out.println(map .get("one"));        System. out.println(map .get("three")); // null        //System.out.println(map.containsKey("three"));        //System.out.println(map.remove("one"));        //System.out.println(map.get("one"));        //System.out.println(map.size());       } }