Logger.java

public class Logger {
	public static void log(HashMap<String, Object> map) {
		for (Map.Entry<String, Object> e : map.entrySet()) {
			System.out.println(e.getKey() + ":" + e.getValue());
		}
	}
}

Main.java

public class Main {
	public static void main(String[] args) {
		Logger.log(new HashMap<String, Object>(){{
			put("int1", 1);
			put("str", "Hello");
		}});
	}
}