Java Collection Framework - HashMap

 

import java.util.HashMap;

public class hashmap {

	public static void main(String[] args) {

		HashMap<Integer, String> hmap = new HashMap<Integer, String>();
        
		hmap.put(1, "hi")
		hmap.put(2, "안녕");
		hmap.put(3, "니하오");
		hmap.put(4, "곤니찌와");

		System.out.println(hmap.get(1));
		System.out.println(hmap.get(2));
		System.out.println(hmap.get(3));
		System.out.println(hmap.get(4));
		System.out.println();

        	for(Integer num : hmap.keySet()){
           		System.out.println(num + " : " + hmap.get(num));
        	}

	}

HashMap<Integer, String> hmap = new HashMap<Integer, String>();

 

Integer > key

String > value