CODEWITHSUNDEEP
javamethodsarraylisthashmap
Supernaturalgirl 1967
Supernaturalgirl 1967

Reputation: 289

Association list, Arraylist Java

I created an association list here:

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

PhoneNumber.put(8559966, "Jill");
PhoneNumber.put(6669999, "James");
PhoneNumber(255666, "Dylan");

What I want to do is call this list in a method but I want to only look at the String half, Jill, James and Dylan. I'm lost on how to do this. I know how to call an ArrayList into a method but not how to call a HashMap and how only look at the Strings.

What I want to do is something likes this:

public String getJill(ArrayList<Integer> PhoneNumber){
    String h;
    for(int i = 0; i<PhoneNumber.size();; i++){
        if(PhoneNumber.values(i) == "Jill"){
            h = "Jill";
        }
        return h;
    }
}

Upvotes: 1

Views: 1295

Answers (1)

gtgaxiola
gtgaxiola

Reputation: 9331

Do you mean Map.values() which returns a Collection? 

public static void main(String[] args) {
    Map<Integer, String> phoneNumber = new HashMap<>();
    phoneNumber.put(8559966, "Jill");
    phoneNumber.put(6669999, "James");
    phoneNumber.put(255666, "Dylan");
    for(String s : phoneNumber.values()) {
        System.out.println(s);
    }
}

Output in my case:

Jill
Dylan
James

Now if you want them in the same order you put them in the Map you must use LinkedHashMap instead of HashMap

Map<Integer, String> phoneNumber = new LinkedHashMap<>();

Then your output will be:

Jill
James
Dylan

Upvotes: 3

Related Questions