Question

I am thinking of a way to look up member ids in Java. But I first need to know if it is possible to store those ids in groups.

Problem is I want the member ID = FirstName, LastName;

How Do I store these together?

ID would be a integer but the names would be a string.

Like if look up member id> 433 || I want to output > Smith, John

I also like to be able to search the name Smith and get > 433, Smith, John

How do I create a variable to store these so they are linked together like so?

I don’t know what this is called or otherwise I would look it up myself. Anyone know where I can begin to research this?

Answer 1

You want to group up your related values into a class such as:

public class Person {
    private final int id;
    private final String firstName;
    private final String lastName;

    public Person(int id, String firstName, String lastName) {
        this.id = id;
        this.firstName = firstName;
        this.lastName = lastName;
    }

    public int getId() {
        return id;
    }

    public String getFirstName() {
        return firstName;
    }

    public String getLastName() {
        return lastName;
    }

    @Override
    public String toString() {
        return String.valueOf(id) + ", " + firstName + ", " + lastName;
    }
}

And then, use a map to search up your values:

public static void main(String[] args) {
    Map<Integer, Person> persons = new HashMap<Integer, Person>();
    persons.put(433, new Person(433, "John", "Smith");
    System.out.println(persons.get(433).toString());
    // The output for this is 433, John, Smith
}