java - 名前と口座番号を含む 2 つのインスタンス変数を追加しますか?

Question

私はJavaの初心者で、文字列インスタンス変数を追加するのに助けが必要です. 私は自分の質問をする方法さえ本当に知りませんが、

public class Account {
  private int AccountNumber;
  private int FirstName;
  private int LastName;
// ok here is where im stuck, i realize that Firstname and LastName are not integers but how else can i make a instance variable of them?           
  private double balance;
 public Account(double initialBalance, int getFirstName, int getLastName, int        getAccountNumber) {
//Int is not the correct type for FirstName and LastName but I dont know what else to call it. Any ideas?
    FirstName = getFirstName;
    LastName = getLastName;
    AccountNumber = getAccountNumber;
    }