Java Rest API – Method to return balance on account [closed]

I need to get the balance for a particular customer id and account id.

I have these two java classes. ( both classes have their get and set methods )

Customer

public class Customer {
private int custid;
private String name;
private String address;
private String email;
private int pin;
private List<Account> accounts = new ArrayList<>();


public Customer(){ 
}

public Customer(int custid,String name, String address, String email, int pin, List<Account> accounts) {
    this.custid = custid;
    this.name = name;
    this.address = address;
    this.email = email;
    this.pin = pin;
    this.accounts = accounts;
}

Account

public class Account {
private int accid;
private int sortCode;
private int accNumber;
private String accType;
private double currentBalance;   
private List<Transaction> transactions = new ArrayList<>();

public Account(){
}

public Account(int accid,int sortCode, int accNumber, String accType, double currentBalance, List<Transaction> transactions) {
    this.accid = accid;
    this.sortCode = sortCode;
    this.accNumber = accNumber;
    this.accType = accType;
    this.currentBalance = currentBalance;
    this.transactions = transactions;

}

I have these two Customer service and Account service classes. Here is a method that is inside the CustomerService and Account Service

CustomerService

public Customer getCustomer(int id) {
    return cList.get(id-1);
}

AccountService

public Account getAccount(int accid) {
    return aList.get(accid-1);
}

I need to take two parameters in my get request like so. I have the below in a separate class.

@GET
@Path("/{customerID}/{accountID}")
@Produces(MediaType.APPLICATION_JSON)
public Customer getBalance(@PathParam("customerID") int cID,@PathParam("accountID") int aID ) {
    //gets customer for CustomerServices and returns it
return customerService.getCustomer(cID);
}

How can I return the balance on given customer id and their account id?

Answer

@GET
@Path("/{customerID}/{accountID}")
@Produces(MediaType.TEXT_PLAIN)
public String getBalance(@PathParam("customerID") int cid, @PathParam("accountID") int aid) {
    //Get specific customer from customers using id
    Customer c = customerService.getCustomer(cid);
    //Get a list of the accounts on that customer
    List<Account> accounts = c.getAccounts();
    Account a = accounts.get(aid - 1);

    Double newBalance = a.getCurrentBalance();
    return "Balance for Customer ID " + cid + " with account ID " + aid + " is " + newBalance;

}

That’s my answer in case anyone is looking at this post and needs something similar.