package modern.challenge; import java.util.HashMap; import java.util.Map; public class Main { public static void main(String[] args) { Map map = new HashMap<>(); map.put("postgresql", "127.0.0.1:5432"); map.put("mysql", "192.168.0.50:3306"); map.put("cassandra", "192.168.1.5:9042"); String hp1 = map.getOrDefault("derby", "69:89.31.226:27017"); String hp2 = map.getOrDefault("mysql", "69:89.31.226:27017"); System.out.println("hp1: " + hp1); System.out.println("hp2: " + hp2); } }