package practice;
import java.util.Map;
import java.util.HashMap;
import java.util.Map.Entry;
import java.util.Objects;
import java.util.Set;
import java.util.Collection;


public class Practice03 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Map<String,String> myMap = new HashMap<>();
        myMap.put("Justin", "Hello! Justin!");
        myMap.put("Monica", "Hello! Monica!");
        myMap.put("Derrik", "Hello! Derrik!");

        foreach(myMap.entrySet());
    }

    // 為什麼不能這樣寫參數型別?? 而只能寫成 static void foreach(Set<Map.Entry<String,String>> set)
    static void foreach(Set<Map.Entry<? extends String, ? extends String>> set){
        for (Map.Entry<? extends String,  ? extends String> obj: set){
            System.out.printf("(%s , %s)%n", obj.getKey(), obj.getValue());
        }
    }


}