ArrayList to HashMap

[jrodri1080]

I have a script that i need help with from school, i have an arraylist and i need to switch that for a HashMap. I would appreciate if anyone can help. THANKS

 import java.util.*; 
 
/**
*
*/
 
 
public class Bank
{
// Storage for an arbitrary number of AccountAtBank objects
 
private ArrayList<AccountAtBank> bankAccounts;
 
 
// Storage for an arbitrary number of Client objects
 
private ArrayList<Client> clients;
 
 
 
public Scanner myScanner = new Scanner(System.in);
 
// Constructor
 
public Bank()
{
bankAccounts = new ArrayList<AccountAtBank>();
clients = new ArrayList<Client>();
}
 
// Mutators
 
 
public void storeBankAccount(AccountAtBank nAccount)
{
/* Check that the account does not exist, before inserting it into the 
* ArrayList.
*/
Iterator<AccountAtBank> iterAccounts = bankAccounts.iterator();
boolean found = false;
AccountAtBank checkAccount;
while (iterAccounts.hasNext() && !found)
{
checkAccount = iterAccounts.next();
if (checkAccount.getCustomer().equals(nAccount.getCustomer()) )
{
found = true;
System.out.println("This client already has an account");
}
}
// If the account does not exist, insert it.
if (!found)
bankAccounts.add(nAccount);
}
 
public void storeClient(Client nClient)
{
clients.add(nClient);
}
 
public void removeBankAccount(int bankAccountIndex)
{
if (bankAccountIndex < 0 || bankAccountIndex >= bankAccounts.size())
{
System.out.println("The account number given does not match with our records");
}
else
{
AccountAtBank accountToDelete = bankAccounts.get(bankAccountIndex);
String custName = accountToDelete.getCustomer(); 
int custAccount = accountToDelete.getAccountNumber();
System.out.println("Is the account of " + custName +" the one you want to delete?");
System.out.println("Please enter y/n.");
System.out.print(">");
 
//Gets the next String of data from the keyboard up to a "\n" and stores it in name
String answer = myScanner.nextLine();
// Convert the answer to upper case to establish a canonical form for the answer
answer = new String(answer.toUpperCase());
if (answer.equals("Y"))
{
bankAccounts.remove(bankAccountIndex);
Iterator<Client> iterClients = clients.iterator();
boolean found = false;
Client checkClient;
while (iterClients.hasNext() && !found)
{
checkClient = iterClients.next();
if(checkClient.getOwner().equals(custName) && 
(checkClient.getAccountNumber() == custAccount))
{
found = true;
clients.remove(clients.indexOf(checkClient));
}
}
 
}
else
{ 
System.out.println("You should verify the account you want to delete");
}
}
}
 
// Accessors
 
// For the bank accounts
 
public int numberOfAccounts()
{
return bankAccounts.size();
}
 
public void showAccount(int accountNumber)
{
Iterator<AccountAtBank> iterAccounts = bankAccounts.iterator();
boolean found = false;
AccountAtBank checkAccount;
while (iterAccounts.hasNext() && !found)
{
checkAccount = iterAccounts.next();
if (checkAccount.getAccountNumber() == accountNumber)
{
found = true;
System.out.println("The account belong to "+ checkAccount.getCustomer());
System.out.println("The balance in the account is $" + checkAccount.getBalance());
}
}
if (!found)
{
System.out.print ("The account number " + accountNumber);
System.out.println(" is not a valid account number");
}
} // End of showAccount
 
public AccountAtBank getBankAccount(int bankAccountIndex)
{
if (bankAccountIndex < 0 || bankAccountIndex >= bankAccounts.size())
{
System.out.println("The account number given does not match with our records");
return null;
}
else
{
AccountAtBank accountToGet = bankAccounts.get(bankAccountIndex);
return accountToGet;
}
} // End of getBankAccount
 
} // End of Bank class
 

[r035198x]

I have a script that i need help with from school, i have an arraylist and i need to switch that for a HashMap. I would appreciate if anyone can help. THANKS

 import java.util.*; 
 
/**
*
*/
 
 
public class Bank
{
// Storage for an arbitrary number of AccountAtBank objects
 
private ArrayList<AccountAtBank> bankAccounts;
 
 
// Storage for an arbitrary number of Client objects
 
private ArrayList<Client> clients;
 
 
 
public Scanner myScanner = new Scanner(System.in);
 
// Constructor
 
public Bank()
{
bankAccounts = new ArrayList<AccountAtBank>();
clients = new ArrayList<Client>();
}
 
// Mutators
 
 
public void storeBankAccount(AccountAtBank nAccount)
{
/* Check that the account does not exist, before inserting it into the 
* ArrayList.
*/
Iterator<AccountAtBank> iterAccounts = bankAccounts.iterator();
boolean found = false;
AccountAtBank checkAccount;
while (iterAccounts.hasNext() && !found)
{
checkAccount = iterAccounts.next();
if (checkAccount.getCustomer().equals(nAccount.getCustomer()) )
{
found = true;
System.out.println("This client already has an account");
}
}
// If the account does not exist, insert it.
if (!found)
bankAccounts.add(nAccount);
}
 
public void storeClient(Client nClient)
{
clients.add(nClient);
}
 
public void removeBankAccount(int bankAccountIndex)
{
if (bankAccountIndex < 0 || bankAccountIndex >= bankAccounts.size())
{
System.out.println("The account number given does not match with our records");
}
else
{
AccountAtBank accountToDelete = bankAccounts.get(bankAccountIndex);
String custName = accountToDelete.getCustomer(); 
int custAccount = accountToDelete.getAccountNumber();
System.out.println("Is the account of " + custName +" the one you want to delete?");
System.out.println("Please enter y/n.");
System.out.print(">");
 
//Gets the next String of data from the keyboard up to a "\n" and stores it in name
String answer = myScanner.nextLine();
// Convert the answer to upper case to establish a canonical form for the answer
answer = new String(answer.toUpperCase());
if (answer.equals("Y"))
{
bankAccounts.remove(bankAccountIndex);
Iterator<Client> iterClients = clients.iterator();
boolean found = false;
Client checkClient;
while (iterClients.hasNext() && !found)
{
checkClient = iterClients.next();
if(checkClient.getOwner().equals(custName) && 
(checkClient.getAccountNumber() == custAccount))
{
found = true;
clients.remove(clients.indexOf(checkClient));
}
}
 
}
else
{ 
System.out.println("You should verify the account you want to delete");
}
}
}
 
// Accessors
 
// For the bank accounts
 
public int numberOfAccounts()
{
return bankAccounts.size();
}
 
public void showAccount(int accountNumber)
{
Iterator<AccountAtBank> iterAccounts = bankAccounts.iterator();
boolean found = false;
AccountAtBank checkAccount;
while (iterAccounts.hasNext() && !found)
{
checkAccount = iterAccounts.next();
if (checkAccount.getAccountNumber() == accountNumber)
{
found = true;
System.out.println("The account belong to "+ checkAccount.getCustomer());
System.out.println("The balance in the account is $" + checkAccount.getBalance());
}
}
if (!found)
{
System.out.print ("The account number " + accountNumber);
System.out.println(" is not a valid account number");
}
} // End of showAccount
 
public AccountAtBank getBankAccount(int bankAccountIndex)
{
if (bankAccountIndex < 0 || bankAccountIndex >= bankAccounts.size())
{
System.out.println("The account number given does not match with our records");
return null;
}
else
{
AccountAtBank accountToGet = bankAccounts.get(bankAccountIndex);
return accountToGet;
}
} // End of getBankAccount
 
} // End of Bank class
 

You can't just switch ArrayList with HashMap. There are two different structures. A map maps two objects. A key and a value. You have to decide what you want as the key and what you want as the value.