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How do I search or access an account I made in my banking system program?

I'm working on a baking system program for a school project which includes the ff. features:
Creating a new account
Balance Inquiry
Deposit
Withdraw
Close account
So far here's the code I've written:
class BankAccountAndaya {
private String accountName, address, birthday, contactNumber;
Scanner sc = new Scanner(System.in);
//default constructor
public BankAccountAndaya() {
}
public BankAccountAndaya(String accountName, String address, String birthday, String contactNumber){
this.accountName = accountName;
this.address = address;
this.birthday = birthday;
this.contactNumber = contactNumber;
}
//accessor
public String getAccountName() {
return accountName;
}
public String getAddress() {
return address;
}
public String getBirthday() {
return birthday;
}
public String getContactNumber() {
return contactNumber;
}
//mutators
public void setAccountName(String name) {
this.accountName = name;
}
public void setAddress(String address) {
this.address = address;
}
public void setBirthday(String birthday) {
this.birthday = birthday;
}
public void setContactNumber(String contactNum) {
this.contactNumber = contactNum;
}
public void getClientDetails() {
System.out.print("Enter name: ");
setAccountName(sc.next());
System.out.print("Enter address: ");
setAddress(sc.next());
System.out.print("Enter birthday (MM/DD/YY): ");
setBirthday(sc.next());
System.out.print("Enter contact number: ");
setContactNumber(sc.next());
}
}
public class SavingsAccountAndaya extends BankAccountAndaya {
private int accountNo;
private double balance, interestRate;
Random rd = new Random();
Scanner sc = new Scanner(System.in);
// default constructor
SavingsAccountAndaya() {
}
// accessors
public int getAccountNo() {
return accountNo;
}
public double getBalance() {
return balance;
}
public double getInterestRate() {
return interestRate;
}
// mutators
public void setAccountNo(int acctNo) {
this.accountNo = acctNo;
}
public void setBalance(double bal) {
this.balance = bal;
}
public void setInterestRate(double intR) {
this.interestRate = intR;
}
public boolean validateAcctNumber(int search) {
for (int i = 0; i < 100; i++) {
int listVal = getAccountNo();
if (search == listVal) {
return true;
}
}
return false;
}
public void balanceInquiry() {
System.out.print("Enter account number: ");
int search = sc.nextInt();
boolean result = validateAcctNumber(search);
if (result) {
System.out.println("Client name: " + getAccountName());
System.out.println("Balance: " + getBalance());
} else {
System.out.println("Account number invalid!");
}
}
public void deposit() {
System.out.print("Enter account number: ");
int search = sc.nextInt();
boolean result = validateAcctNumber(search);
if (result) {
System.out.print("Enter amount to deposit: ");
double deposit = sc.nextDouble();
if (deposit >= 100) {
balance += deposit;
interestRate = 0.05 * balance;
balance += interestRate;
System.out.println("Amount deposit successful!");
System.out.println("Updated balance: " + balance);
} else {
System.out.println("Invalid deposit number!");
}
} else {
System.out.println("Invalid account number!");
}
}
public void withdraw() {
System.out.print("Enter account number: ");
int search = sc.nextInt();
boolean result = validateAcctNumber(search);
if (result) {
System.out.print("Enter amount to withdraw: ");
double withdraw = sc.nextDouble();
double mainBal = withdraw - balance;
if (withdraw >= 100 && withdraw < balance && mainBal >= 5000) {
balance -= withdraw;
System.out.println("Amount withdrawn successful!");
System.out.println("Updated balance: " + balance);
} else {
System.out.println("Invalid withrawal amount!");
}
} else {
System.out.println("Invalid account number!");
}
}
public void closeAccount() {
System.out.print("Enter account number: ");
int search = sc.nextInt();
boolean result = validateAcctNumber(search);
if (result) {
setAccountNo(0);
setBalance(0);
setAccountName("");
setAddress("");
setBirthday("");
setContactNumber("");
} else {
System.out.println("Invalid account number!");
}
}
}
public class ClientAndaya extends SavingsAccountAndaya {
/**
* #param args the command line arguments
*/
public static void displayMainMenu() {
System.out.println("JBank Main Menu");
System.out.println("[1] New Account");
System.out.println("[2] Balance Inquiry");
System.out.println("[3] Deposit");
System.out.println("[4] Withdraw");
System.out.println("[5] Client Profile");
System.out.println("[6] Close Account");
System.out.println("[7] Exit");
}
public static void main(String[] args) {
int i = 0;
SavingsAccountAndaya[] sa = new SavingsAccountAndaya[100];
Random rd = new Random();
Scanner sc = new Scanner(System.in);
int input;
do {
displayMainMenu();
System.out.print("Enter number: ");
input = sc.nextInt();
sa[i] = new SavingsAccountAndaya();
switch (input) {
case 1:
System.out.println("New Account: ");
sa[i].getClientDetails();
System.out.print("Enter amount to deposit: ");
double inDepo = sc.nextDouble();
if (inDepo < 5000) {
System.out.println("Invalid initial deposit amount!");
System.out.println("Amount must be greater than 5000 PHP");
System.out.print("Enter amount to deposit: ");
inDepo = sc.nextDouble();
}
sa[i].setBalance(inDepo);
// generate account number
int ranNo = rd.nextInt(9999);
sa[i].setAccountNo(ranNo);
System.out.println("Account number: " + sa[i].getAccountNo());
i++;
break;
case 2:
System.out.println("Balance Inquiry: ");
sa[i].balanceInquiry();
break;
case 3:
System.out.println("Deposit: ");
sa[i].deposit();
break;
case 4:
System.out.println("Withdraw: ");
sa[i].withdraw();
break;
case 5:
System.out.println("Client Profile: ");
System.out.println("Account number: " + sa[i].getAccountNo());
System.out.println("Accoutn Name: " + sa[i].getAccountName());
System.out.println("Address: " + sa[i].getAddress());
System.out.println("Birthday: " + sa[i].getBirthday());
System.out.println("Contact Number: " + sa[i].getContactNumber());
System.out.println("Balance: " + sa[i].getBalance());
break;
case 6:
System.out.println("Close Account: ");
sa[i].closeAccount();
break;
case 7:
break;
default:
System.out.println("Invalid chosen number!");
}
} while (input < 6 && input > 0);
}
}
I can't seem to access or search for an account I've created. Whenever I input the account number, it always results to invalid account number even though I've already created an account that has that account number. I think the problem lies with the validateAcctNumber method:
public boolean validateAcctNumber(int search) {
for (int i = 0; i < 100; i++) {
int listVal = getAccountNo();
if (search == listVal) {
return true;
}
}
return false;
}
It was also mentioned in the instructions to use exception to validate inputs.
How can I solve this problem? Thank you for your help.

How to read and store inputs properly in this program? [duplicate]

This question already has answers here:
Scanner is skipping nextLine() after using next() or nextFoo()?
(24 answers)
Closed 3 years ago.
How to get input values properly and store them to use further in this program?
I don't know why but this program is outputting Full Name: and Address: at once and taking input values only for Address:. Also, when I'm outputting New Account option, it is not outputting First Name:.
package com.company;
import java.util.Scanner;
public class Main {
public static final Scanner input = new Scanner(System.in);
public String name;
public int age;
public long personummer;
public String address;
public long phoneNumber;
public long amount;
public boolean created = false;
public static void main(String[] args) {
Main BankID = new Main();
int option;
do {
System.out.println("- - - - Welcome to Bank of Hkr - - - -");
System.out.println();
System.out.println("1) New account");
System.out.println("2) View account");
System.out.println("3) Deposit");
System.out.println("4) Withdraw");
System.out.println("5) Exit");
System.out.println();
System.out.println("- - - - - - - - - - - - - - - - - - - - - ");
System.out.println();
System.out.println(">> Please choose an option...");
option = input.nextInt();
switch (option) {
case 1:
BankID.newAccount();
break;
case 2:
BankID.viewAccount();
break;
case 3:
BankID.deposit();
break;
case 4:
BankID.withdraw();
break;
default:
System.out.println(">> Not A Valid Option ");
}
} while (option != 5);
}
public void newAccount() {
System.out.println("New Account Wizard");
System.out.println("------------------");
System.out.println("Enter the following details: ");
System.out.println();
System.out.println("Full Name: ");
name = input.nextLine();
System.out.println("Address: ");
address = input.nextLine();
System.out.println("Age: ");
age = input.nextInt();
System.out.println("Personummer: ");
personummer = input.nextLong();
System.out.print("Phone Number: ");
phoneNumber = input.nextLong();
System.out.println("Thanks. Your details have been saved.");
}
public void viewAccount() {
if (created) {
System.out.println("View Account");
System.out.println("Full Name: " + name);
System.out.println("Age: " + age);
System.out.println("Personummer: " + personummer);
System.out.println("Address: " + address);
System.out.println("Phone Number: " + phoneNumber);
System.out.println("Amount: " + amount);
} else System.out.println("First create an account");
}
public void deposit() {
if (created) {
System.out.println("Deposit");
System.out.print("Enter the deposit amount: ");
amount += input.nextLong();
} else System.out.println("First create an account");
}
public void withdraw() {
if (created) {
System.out.println("Withdraw");
System.out.print("Enter the withdrawal amount: ");
amount -= input.nextLong();
} else System.out.println("First create an account");
}
}
Apologies if the rest of the code isn't related to the question asked. But I'm no expert and might have made some other major mistake in any other part of the code.

I did not go through all the code but I made some changes to address the issues the mentioned. You will see that I am using a separate Scanner for Strings. Also, I am setting created to true once the account has been created. I also added the case for option 5 for completeness.
import java.util.Scanner;
public class Main {
public static final Scanner input = new Scanner(System.in);
public static final Scanner stringInput = new Scanner(System.in);
public String name;
public int age;
public long personummer;
public String address;
public long phoneNumber;
public long amount;
public boolean created = false;
public static void main(String[] args) {
Main BankID = new Main();
int option;
do {
System.out.println("- - - - Welcome to Bank of Hkr - - - -");
System.out.println();
System.out.println("1) New account");
System.out.println("2) View account");
System.out.println("3) Deposit");
System.out.println("4) Withdraw");
System.out.println("5) Exit");
System.out.println();
System.out.println("- - - - - - - - - - - - - - - - - - - - - ");
System.out.println();
System.out.println(">> Please choose an option...");
option = input.nextInt();
switch (option) {
case 1:
BankID.newAccount();
break;
case 2:
BankID.viewAccount();
break;
case 3:
BankID.deposit();
break;
case 4:
BankID.withdraw();
break;
case 5:
break;
default:
System.out.println(">> Not A Valid Option ");
}
} while (option != 5);
}
public void newAccount() {
System.out.println("New Account Wizard");
System.out.println("------------------");
System.out.println("Enter the following details: ");
System.out.println();
System.out.println("Full Name: ");
name = stringInput.nextLine();
System.out.println("Address: ");
address = stringInput.nextLine();
System.out.println("Age: ");
age = input.nextInt();
System.out.print("Personummer: ");
personummer = input.nextLong();
System.out.print("Phone Number: ");
phoneNumber = input.nextLong();
created = true;
System.out.println("Thanks. Your details have been saved.");
}
public void viewAccount() {
if (created) {
System.out.println("View Account");
System.out.println("Full Name: " + name);
System.out.println("Address: " + address);
System.out.println("Age: " + age);
System.out.println("Personummer: " + personummer);
System.out.println("Phone Number: " + phoneNumber);
System.out.println("Amount: " + amount);
} else System.out.println("First create an account");
}
public void deposit() {
if (created) {
System.out.println("Deposit");
System.out.print("Enter the deposit amount: ");
amount += input.nextLong();
} else System.out.println("First create an account");
}
public void withdraw() {
if (created) {
System.out.println("Withdraw");
System.out.print("Enter the withdrawal amount: ");
amount -= input.nextLong();
} else System.out.println("First create an account");
}
}

Bank Account Java Program

I am creating a bank account program for my java class that is suppose to manage up to 5 different bank accounts. The program has to allow the creation of a new account, which I have done, allow deposit and withdraw, which is also done, the 2 parts I cannot get to work are 1: the bank can only have up to 5 accounts, so if a 6th is trying to be created, a message comes up saying that 5 are already created, and 2: one of the options has to print out all the account balances of current accounts in the bank.
This is my code as of now:
import java.util.Scanner;
public class Bankapp {
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
Bank myBank = new Bank();
int user_choice = 2;
do {
//display menu to user
//ask user for his choice and validate it (make sure it is between 1 and 6)
System.out.println();
System.out.println("1) Open a new bank account");
System.out.println("2) Deposit to a bank account");
System.out.println("3) Withdraw to bank account");
System.out.println("4) Print account balance");
System.out.println("5) Quit");
System.out.println();
System.out.print("Enter choice [1-5]: ");
user_choice = s.nextInt();
switch (user_choice) {
case 1:
System.out.println("Enter a customer name");
String cn = s.next();
System.out.println("Enter a opening balance");
double d = s.nextDouble();
System.out.println("Account was created and it has the following number: " + myBank.openNewAccount(cn, d));
break;
case 2: System.out.println("Enter a account number");
int an = s.nextInt();
System.out.println("Enter a deposit amount");
double da = s.nextDouble();
myBank.depositTo(an, da);
break;
case 3: System.out.println("Enter a account number");
int acn = s.nextInt();
System.out.println("Enter a withdraw amount");
double wa = s.nextDouble();
myBank.withdrawFrom(acn, wa);
break;
case 4: System.out.println("Enter a account number");
int anum = s.nextInt();
myBank.printAccountInfo(anum);
break;
case 5:
System.out.println("Here are the balances " + "for each account:");
case 6:
System.exit(0);
}
}
while (user_choice != '6');
}
static class Bank {
private BankAccount[] accounts; // all the bank accounts at this bank
private int numOfAccounts = 5; // the number of bank accounts at this bank
// Constructor: A new Bank object initially doesn’t contain any accounts.
public Bank() {
accounts = new BankAccount[5];
numOfAccounts = 0;
}
// Creates a new bank account using the customer name and the opening balance given as parameters
// and returns the account number of this new account. It also adds this account into the account list
// of the Bank calling object.
public int openNewAccount(String customerName, double openingBalance) {
BankAccount b = new BankAccount(customerName, openingBalance);
accounts[numOfAccounts] = b;
numOfAccounts++;
return b.getAccountNum();
}
// Withdraws the given amount from the account whose account number is given. If the account is
// not available at the bank, it should print a message.
public void withdrawFrom(int accountNum, double amount) {
for (int i =0; i<numOfAccounts; i++) {
if (accountNum == accounts[i].getAccountNum() ) {
accounts[i].withdraw(amount);
System.out.println("Amount withdrawn successfully");
return;
}
}
System.out.println("Account number not found.");
}
// Deposits the given amount to the account whose account number is given. If the account is not
// available at the bank, it should print a message.
public void depositTo(int accountNum, double amount) {
for (int i =0; i<numOfAccounts; i++) {
if (accountNum == accounts[i].getAccountNum() ) {
accounts[i].deposit(amount);
System.out.println("Amount deposited successfully");
return;
}
}
System.out.println("Account number not found.");
}
// Prints the account number, the customer name and the balance of the bank account whose
// account number is given. If the account is not available at the bank, it should print a message.
public void printAccountInfo(int accountNum) {
for (int i =0; i<numOfAccounts; i++) {
if (accountNum == accounts[i].getAccountNum() ) {
System.out.println(accounts[i].getAccountInfo());
return;
}
}
System.out.println("Account number not found.");
}
public void printAccountInfo(int accountNum, int n) {
for (int i =0; i<numOfAccounts; i++) {
if (accountNum == accounts[i].getAccountNum() ) {
System.out.println(accounts[i].getAccountInfo());
return;
}
}
System.out.println("Account number not found.");
}
}
static class BankAccount{
private int accountNum;
private String customerName;
private double balance;
private static int noOfAccounts=0;
public String getAccountInfo(){
return "Account number: " + accountNum + "\nCustomer Name: " + customerName + "\nBalance:" + balance +"\n";
}
public BankAccount(String abc, double xyz){
customerName = abc;
balance = xyz;
noOfAccounts ++;
accountNum = noOfAccounts;
}
public int getAccountNum(){
return accountNum;
}
public void deposit(double amount){
if (amount<=0) {
System.out.println("Amount to be deposited should be positive");
} else {
balance = balance + amount;
}
}
public void withdraw(double amount)
{
if (amount<=0){
System.out.println("Amount to be withdrawn should be positive");
}
else
{
if (balance < amount) {
System.out.println("Insufficient balance");
} else {
balance = balance - amount;
}
}
}
}//end of class
The program runs fine, I just need to add these two options, and cannot get them to work properly, how would I go about doing this? Also, options 3 and 4 should not work if no accounts have been created yet. Thanks in advance.
UPDATE: this is what I tried, I keep getting a this method must return type int error.
public int openNewAccount(String customerName, double openingBalance) {
if(numOfAccounts > 5)
{
System.out.println("5 accounts already exist");
}
else
{
BankAccount b = new BankAccount(customerName, openingBalance);
accounts[numOfAccounts] = b;
numOfAccounts++;
return b.getAccountNum();
}
}
UPDATE 2: I added a return statement, now when it runs it will open accounts up to number 5, but for every account after number 5 it just says the account number is 5 again instead of not opening an account.
public int openNewAccount(String customerName, double openingBalance) {
if(numOfAccounts > 5)
{
System.out.println("5 accounts already exist");
}
else
{
BankAccount b = new BankAccount(customerName, openingBalance);
accounts[numOfAccounts] = b;
numOfAccounts++;
return b.getAccountNum();
}
return numOfAccounts;
}

Its pretty simple. Create a list of size 5 and add the account into that list when user is created one. Before adding just make a check whether list size <= 5. If it is true, go ahead and add the account, otherwise throw an error
For option 2, just iterate through the list and display the results

1; in the openNewBank account method; before creating the new Bank account and increasing the count by 1; check if the number of account is already at 5 or higher and if it is dont create the account and dont increase the count.
2: Loop through the number of account variable and print.

I added password system to it. and nice looking account num.
Code :
import java.io.*;
import java.util.Random;
public class Computer_Bank_of_India {
public static int NewRandom(int min, int max) {
Random rand = new Random();
int randomNum = rand.nextInt((max - min) + 1) + min;
return randomNum;
}
public static void main(String args[])throws IOException, InterruptedException {
InputStreamReader ir = new InputStreamReader(System.in);
BufferedReader br = new BufferedReader(ir);
Bank myBank = new Bank();
int Option = 1, Account_Number, Account_Password, atempts = 0, Pass;
String Name;
double Balance, Money;
System.out.println("Please wait, the system is starting...");
while(Option !=5) {
Thread.sleep(4000);
System.out.println("1) Open a new bank account");
Thread.sleep(250);
System.out.println("2) Deposit to a bank account");
Thread.sleep(250);
System.out.println("3) Withdraw to bank account");
Thread.sleep(250);
System.out.println("4) Print the detailed account information including last transactions");
Thread.sleep(250);
System.out.println("5) Quit");
System.out.println();
System.out.print(" Enter Option [1-5]: ");
Option = Integer.parseInt(br.readLine());
switch(Option) {
case 1 : System.out.println("Enter a customer name :");
Name = br.readLine();
System.out.println("Enter a opening balance :");
Balance = Double.parseDouble(br.readLine());
Thread.sleep(250);
System.out.println("Creating your account....");
Thread.sleep(500);
int[] arrDetails= myBank.AddNewAccount(Name, Balance);
System.out.println("Account Has been created\n Account number: " + arrDetails[0]+"\nYour password : "+ arrDetails[1]);
break;
case 2 : System.out.println("Enter a account number :");
Account_Number = Integer.parseInt(br.readLine());
System.out.println("Enter a account password :");
Account_Password = Integer.parseInt(br.readLine());
System.out.println("Enter a deposit amount :");
Money = Double.parseDouble(br.readLine());
myBank.Deposit(Account_Number, Account_Password, Money);
break;
case 3 : System.out.println("Enter a account number :");
Account_Number = Integer.parseInt(br.readLine());
System.out.println("Enter a account password :");
Account_Password = Integer.parseInt(br.readLine());
System.out.println("Enter a deposit amount :");
Money = Double.parseDouble(br.readLine());
myBank.Withdraw(Account_Number, Account_Password, Money);
break;
case 4 : System.out.println("Enter a account number :");
Account_Number = Integer.parseInt(br.readLine());
System.out.println("Enter a account password :");
Account_Password = Integer.parseInt(br.readLine());
myBank.Transactions(Account_Number, Account_Password);
break;
case 5 : System.out.println("Please Enter your password :");
Pass = Integer.parseInt(br.readLine());
if(Pass == myBank.Password) {
System.out.println(" System shutting down.....");
Option = 5;
break;
}
else {
Thread.sleep(250);
System.out.println("You have enter a wrong password. Please try again");
Option = 0;
}
default: System.out.println("Invalid option. Please try again.");
}
}
}
static class Bank {
private int Password=2684;
private BankAccount[] accounts;
private int numOfAccounts;
public Bank() {
accounts = new BankAccount[100];
numOfAccounts = 0;
}
public int [] AddNewAccount(String Name, Double Balance) {
BankAccount b = new BankAccount(Name, Balance);
accounts[numOfAccounts] = b;
numOfAccounts++;
int Acc = b.getAccountNum()[0];
int Pass = b.getAccountNum()[1];
int[]details = {Acc, Pass};
return details;
}
public void Withdraw(int Account_Number, int pass, double Money) {
for (int i =0; i<numOfAccounts; i++) {
int a = accounts[i].getAccountNum()[0];
if (Account_Number == a) {
int p = accounts[i].getAccountNum()[1];
if( pass == p) {
accounts[i].withdraw(Money);
return;
}
}
}
System.out.println(" You have entered a wrong Account number or Password.");
}
public void Deposit(int Account_Number, int pass, double Money) {
for (int i =0; i<numOfAccounts; i++) {
int a = accounts[i].getAccountNum()[0];
if (Account_Number == a) {
int p = accounts[i].getAccountNum()[1];
if( pass == p) {
accounts[i].deposit(Money);
return;
}
}
}
System.out.println(" You have entered a wrong Account number or Password.");
}
public void Transactions(int Account_Number, int pass) {
for(int i = 0;i<numOfAccounts; i++) {
int a = accounts[i].getAccountNum()[0];
if (Account_Number == a ) {
int p = accounts[i].getAccountNum()[1];
if( pass == p) {
System.out.println(accounts[i].getAccountInfo());
System.out.println(" Last transaction: " + accounts[i].getTransactionInfo(accounts[i].getNumberOfTransactions()-1));
return;
}
}
}
System.out.println(" You have entered a wrong Account number or Password.");
}
}
static class BankAccount{
private int User_Password;
private int accountNum;
private String customerName;
private double balance;
private double[] transactions;
private String[] transactionsSummary;
private int numOfTransactions;
private static int noOfAccounts=0;
public String getAccountInfo(){
return " Account number: " + accountNum + "\n Customer Name: " + customerName + "\n Balance:" + balance +"\n";
}
public String getTransactionInfo(int n) {
String transaction = transactionsSummary[n];
return transaction;
}
public BankAccount(String abc, double xyz){
customerName = abc;
balance = xyz;
noOfAccounts ++;
User_Password = NewRandom(1000, 9999);
accountNum = NewRandom(800000000, 999999999);
transactions = new double[100];
transactionsSummary = new String[100];
transactions[0] = balance;
transactionsSummary[0] = "A balance of : Rs" + Double.toString(balance) + " was deposited.";
numOfTransactions = 1;
}
public int [] getAccountNum(){
int account = accountNum;
int Pass = User_Password;
int [] details = {account, Pass};
return details;
}
public int getNumberOfTransactions() {
return numOfTransactions;
}
public void deposit(double amount){
if (amount<=0) {
System.out.println("Amount to be deposited should be positive");
} else {
balance = balance + amount;
transactions[numOfTransactions] = amount;
transactionsSummary[numOfTransactions] = "Rs." + Double.toString(amount) + " was deposited.";
numOfTransactions++;
System.out.println(" Amount deposited successfully");
}
}
public void withdraw(double amount) {
if (amount<=0){
System.out.println("Amount to be withdrawn should be positive");
}
else {
if (balance < amount) {
System.out.println("Insufficient balance");
} else {
balance = balance - amount;
transactions[numOfTransactions] = amount;
transactionsSummary[numOfTransactions] = "Rs." + Double.toString(amount) + " was withdrawn.";
numOfTransactions++;
System.out.println(" Amount Withdrawn successfully");
}
}
}
}
}

Arrays and bank accounts in Java

I am trying to write a simple Bank Account Management program that does the following:
Creates a new account with Account number and Balance taken from user and stored in an array
Selects an account (from the array)
Deletes the account selected
Withdraw and Deposit into account selected.
Problem: I don't understand what the my mistakes are.
I tried using different types of arrays for account number and balance storing, but I didn't not find the answer yet. I search the web and Stackoverflow for references, documentations, simple examples, but could not find any (the ones that I found, use some commands and things that I haven't learned yet so I can understand how they work). I am a beginner, I am still learning and would appreciate some advice. Thanks!
//Bank account class
public class account {
private int ANumber;
private double balance;
public account(double initialBalance, int accno) {
balance = initialBalance;
ANumber = accno;
}
public void deposit (double u_amm){
balance += u_amm;
}
public double withdraw(double amount) {
balance -= amount;
return amount;
}
public double getBalance() {
return balance;
}
public int getAccount(){
return ANumber;
}
}
And this is the Main class
import java.util.Scanner;
// main class
public class bankmain {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
// Menu starts from here
Scanner input = new Scanner(System.in);
System.out.println("Enter the option for the operation you need:");
System.out.println("****************************************************");
System.out.println("[ Options: ne - New Account de - Delete Account ]");
System.out.println("[ dp - Deposit wi - Withdraw ]");
System.out.println("[ se - Select Account ex - Quit ]");
System.out.println("****************************************************");
System.out.print("> "); //indicator for user input
String choice = input.next();
//Options
while(true){
if(choice == "ne"){
int nacc;
int bal;
int [][]array = new int[nacc][bal]; // Array for account and balance
System.out.print("Insert account number: ");
nacc =input.nextInt(); //-- Input nr for array insertion
System.out.print("Enter initial balance: ");
bal=input.nextInt(); //-- Input nr for array insertion
System.out.println("Current account: " + nacc + " " + "Balance " + bal);
break;
}
// account selection
if(choice.equals("se")){
System.out.println("Enter number of account to be selected: ");
//user input for account nr from array
System.out.println("Account closed.");
}
//close account
if(choice.equals("de")){
//array selected for closing
System.out.println("Account closed.");
}
// deposit
if(choice.equals("dp")){
System.out.print("Enter amount to deposit: ");
double amount = scan.nextDouble();
if(amount <= 0){
System.out.println("You must deposit an amount greater than 0.");
} else {
System.out.println("You have deposited " + (amount + account.getBalance()));
}
}
// withdrawal
if(choice.equals("wi")){
System.out.print("Enter amount to be withdrawn: ");
double amount = scan.nextDouble();
if (amount > account.balance()){
System.out.println("You can't withdraw that amount!");
} else if (amount <= account.balance()) {
account.withdraw(amount);
System.out.println("NewBalance = " + account.getBalance());
}
}
//quit
if(choice == "ex"){
System.exit(0);
}
} // end of menu loop
}// end of main
} // end of class

Your code was wrong on many levels - first try to work on your formatting and naming conventions so you don't learn bad habbits. Dont use small leters for naming classes, try to use full words to describe variables and fields, like in that Account.class example:
public class Account {
private Integer accountNumber;
private Double balance;
public Account(final Integer accountNumber, final Double initialBalance) {
this.accountNumber = accountNumber;
balance = initialBalance;
}
public Double deposit (double depositAmmount) {
balance += depositAmmount;
return balance;
}
public Double withdraw(double withdrawAmmount) {
balance -= withdrawAmmount;
return balance;
}
public Double getBalance() {
return balance;
}
public Integer getAccountNumber() {
return accountNumber;
}
}
Also try to use the same formatting(ie. spaces after brackets) in all code, so that it's simpler for you to read.
Now - what was wrong in your app:
Define the proper holder for your accounts i.e. HashMap that will hold the information about all accounts and will be able to find them by accountNumber.
HashMap<Integer, Account> accountMap = new HashMap<Integer, Account>();
This one should be inside your while loop, as you want your user to do multiple tasks. You could ommit the println's but then the user would have to go back to the top of the screen to see the options.
System.out.println("Enter the option for the operation you need:");
System.out.println("****************************************************");
System.out.println("[ Options: ne - New Account de - Delete Account ]");
System.out.println("[ dp - Deposit wi - Withdraw ]");
System.out.println("[ se - Select Account ex - Quit ]");
System.out.println("****************************************************");
System.out.print("> "); //indicator for user input
String choice = input.nextLine();
System.out.println("Your choice: " + choice);
You shouldn't compare Strings using '==' operator as it may not return expected value. Take a look at: How do I compare strings in Java? or What is the difference between == vs equals() in Java?. For safty use Objects equals instead, ie:
choice.equals("ne")
There was no place where you created the account:
Account newAccount = new Account(newAccountNumber, initialBalance);
You didn't use if-else, just if's. It should look more like that (why to check if the choice is 'wi' if it was already found to be 'ne'):
if(choice.equals("ne")) {
//doStuff
} else if choice.equals("se") {
//doStuff
} //and so on.
If your using Java version >= 7 then instead of if-else you can use switch to compare Strings.
There was no notification of the wrong option:
} else {
System.out.println("Wrong option chosen.");
}
You didn't close your Scanner object. This really doesn't matter here, as it's in main method and will close with it, but it's a matter of good habbits to always close your streams, data sources etc when done using it:
input.close();
So the whole code can look like this:
import java.util.HashMap;
import java.util.Scanner;
// main class
public class BankAccount {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
HashMap<Integer, Account> accountMap = new HashMap<Integer, Account>();
//Options
while(true) {
System.out.println("Enter the option for the operation you need:");
System.out.println("****************************************************");
System.out.println("[ Options: ne - New Account de - Delete Account ]");
System.out.println("[ dp - Deposit wi - Withdraw ]");
System.out.println("[ se - Select Account ex - Quit ]");
System.out.println("****************************************************");
System.out.print("> "); //indicator for user input
String choice = input.next();
System.out.println("Your choice: " + choice);
if(choice.equals("ne")) {
Integer newAccountNumber;
Double initialBalance;
Account newAccount;
// Array for account and balance
System.out.print("Insert account number: ");
newAccountNumber = input.nextInt(); //-- Input nr for array insertion
System.out.print("Enter initial balance: ");
initialBalance=input.nextDouble(); //-- Input nr for array insertion
newAccount = new Account(newAccountNumber, initialBalance);
accountMap.put(newAccountNumber, newAccount);
System.out.println("New Account " + newAccountNumber + " created with balance: " + initialBalance);
}
//select account
else if(choice.equals("se")) {
System.out.println("Enter number of account to be selected: ");
Integer accountToGetNumber = input.nextInt();
Account returnedAccount = accountMap.get(accountToGetNumber);
if (returnedAccount != null)
{
System.out.println("Account open. Current balance: " + returnedAccount.getBalance());
}
else
{
//user input for account nr from array
System.out.println("Account does not exist.");
}
}
//close account
else if(choice.equals("de"))
{
System.out.println("Enter number of account to be selected: ");
Integer accountToDeleteNumber = input.nextInt();
Account removedAccount = accountMap.remove(accountToDeleteNumber);
if (removedAccount != null)
{
System.out.println("Account " + removedAccount.getAccountNumber() + " has been closed with balance: " + removedAccount.getBalance());
}
else
{
//user input for account nr from array
System.out.println("Account does not exist.");
}
}
// deposit
else if(choice.equals("dp")) {
System.out.println("Enter number of account to deposit: ");
Integer accountToDeposit = input.nextInt();
System.out.print("Enter amount to deposit: ");
double amount = input.nextDouble();
if(amount <= 0){
System.out.println("You must deposit an amount greater than 0.");
} else {
accountMap.get(accountToDeposit).deposit(amount);
System.out.println("You have deposited " + (amount));
System.out.println("Current balance " + accountMap.get(accountToDeposit).getBalance());
}
}
// withdrawal
else if(choice.equals("wi")) {
System.out.println("Enter number of account to withdraw: ");
Integer accountToWithdraw = input.nextInt();
System.out.print("Enter amount to withdraw: ");
double amount = input.nextDouble();
if(amount <= 0) {
System.out.println("You must deposit an amount greater than 0.");
} else {
accountMap.get(accountToWithdraw).withdraw(amount);
System.out.println("You have deposited " + (amount));
System.out.println("Current balance " + accountMap.get(accountToWithdraw).getBalance());
}
}
//quit
else if(choice.equals("ex")) {
break;
} else {
System.out.println("Wrong option.");
} //end of if
} //end of loop
input.close();
} //end of main
} //end of class
There still is much to improve, i.e. input validation - but this should work for the begining.

You have written the above code, but it has many mistakes. You need to learn the The basics of Java programming.
I have modified your program to perform below operations :-
Create new account.
Select existing account.
Deposit amount.
Withdraw amount.
View balance.
Delete account.
Exit.
Account.java :
/**
* This class performs bank operations
*/
public class Account {
private int accNumber;
private double balance;
public Account(double initialBalance, int accNo) {
balance = initialBalance;
accNumber = accNo;
}
public void deposit(double amount) {
balance += amount;
}
public double withdraw(double amount) {
balance -= amount;
return amount;
}
public double getBalance() {
return balance;
}
public int getAccNumber() {
return accNumber;
}
}
BankMain.java :
public class BankMain {
private static double amount;
private static ArrayList<Account> accountList = new ArrayList<>();
private static Account selectedAccount;
private static boolean flag = false;
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
// Menu starts from here
Scanner input = new Scanner(System.in);
System.out.println("Enter the option for the operation you need:");
System.out
.println("****************************************************");
System.out
.println("[ Options: new - New Account del - Delete Account ]");
System.out
.println("[ dp - Deposit wi - Withdraw bal - Check balance ]");
System.out
.println("[ se - Select Account exit - Quit ]");
System.out
.println("****************************************************");
Account account = null;
while (true) {
System.out.println("> "); // indicator for user input
String choice = input.next();
// Options
switch (choice) {
case "new":
// Create new account
int accNo = 0;
int bal = 0;
System.out.println("Enter account number : ");
accNo = input.nextInt();
System.out.println("Enter initial balance: ");
bal = input.nextInt();
System.out.println("Current account: " + accNo + " "
+ "Balance " + bal);
account = new Account(bal, accNo);
accountList.add(account);
break;
case "se":
// select account
System.out
.println("Enter account number for further operations : ");
int selectedAcc = scan.nextInt();
System.out.println("Selected account : " + selectedAcc);
for (Object object : accountList) {
selectedAccount = (Account) object;
if (selectedAccount.getAccNumber() == selectedAcc) {
flag = true;
break;
} else {
flag = false;
}
}
if (!flag) {
System.out.println("Account doesn't exists.");
}
if (accountList.size() == 0) {
System.out.println("Zero account exists.");
}
break;
case "del":
// close account
System.out
.println("Enter account number for further operations : ");
int selectedAcc1 = scan.nextInt();
System.out.println("Selected account : " + selectedAcc1);
Iterator<Account> iterator = accountList.iterator();
while (iterator.hasNext()) {
selectedAccount = (Account) iterator.next();
if (selectedAccount.getAccNumber() == selectedAcc1) {
iterator.remove();
flag = true;
break;
}
}
if (!flag) {
System.out.println("Account doesn't exists.");
}
System.out.println("Account " + selectedAcc1 + " closed.");
break;
case "dp":
// Deposit amount
System.out.println("Enter amount to deposit : ");
amount = scan.nextDouble();
if (amount <= 0) {
System.out
.println("You must deposit an amount greater than 0.");
} else {
if (flag) {
selectedAccount.deposit(amount);
System.out.println("You have deposited " + amount
+ ". Total balance : "
+ (selectedAccount.getBalance()));
} else {
System.out.println("Please select account number.");
}
}
break;
case "wi":
// Withdraw amount
System.out.println("Enter amount to be withdrawn: ");
amount = scan.nextDouble();
if (amount > account.getBalance() && amount <= 0) {
System.out.println("You can't withdraw that amount!");
} else if (amount <= selectedAccount.getBalance()) {
if (flag) {
selectedAccount.withdraw(amount);
System.out.println("You have withdraw : " + amount
+ " NewBalance : "
+ selectedAccount.getBalance());
} else {
System.out.println("Please select account number.");
}
}
break;
case "bal":
// check balance in selected account
if (flag) {
System.out.println("Your current account balance : "
+ selectedAccount.getBalance());
} else {
System.out.println("Please select account number.");
}
break;
case "exit":
default:
// quit
System.out.println("Thank You. Visit Again!");
flag = false;
input.close();
scan.close();
System.exit(0);
break;
}
} // end of menu loop
}// end of main
} // end of class
I have tested this code & it is working fine.
Output :
Enter the option for the operation you need:
****************************************************
[ Options: new - New Account del - Delete Account ]
[ dp - Deposit wi - Withdraw bal - Check balance ]
[ se - Select Account exit - Quit ]
****************************************************
> new
Enter account number : 101
Enter initial balance: 10000
Current account: 101 Balance 10000
> new
Enter account number : 102
Enter initial balance: 25000
Current account: 102 Balance 25000
> se
Enter account number for further operations : 103
Selected account : 103
Account doesn't exists.
> se
Enter account number for further operations : 101
Selected account : 101
> bal
Your current account balance : 10000.0
> dp
Enter amount to deposit : 2500
You have deposited 2500.0. Total balance : 12500.0
> wi
Enter amount to be withdrawn: 500
You have withdraw : 500.0 NewBalance : 12000.0
> se
Enter account number for further operations : 102
Selected account : 102
> bal
Your current account balance : 25000.0
> del
Enter account number for further operations : 101
Selected account : 101
Account 101 closed.
> se
Enter account number for further operations : 101
Selected account : 101
Account doesn't exists.
> exit
Thank You. Visit Again!

How do I access my array in my method?

Here is my issue. I am trying to build an array of HomeLoan in my main, and then from my main, call the printHLoans(hLoans) from my main, so that I can list them and then add more functionality. Unfortunately, it is saying that hLoan cannot be resolved as a variable.
Main Class
import java.util.InputMismatchException;
import java.util.Scanner;
public class LoanTest
{
static int term;
static int loanID=0;
static int hHowMany=0;
static int cHowMany=0;
public static void main(String[] args)
{
Scanner input = new Scanner (System.in);
System.out.print("Enter name: ");
String name = input.nextLine();
System.out.print("Enter Customer ID: ");
int custID=0;
do
{
try
{
custID = input.nextInt();
}
catch (InputMismatchException e)
{
System.out.println("Customer IDs are numbers only");
input.next();
}
}while (custID<1);
boolean aa=true;
while(aa)
{
System.out.println("Do you have a (h)ome loan or a (c)ar loan?");
String a = input.next();
switch (a)
{
case "h": System.out.println("You selected Home Loan");
System.out.println("How many Home Loans would you like to enter?");
hHowMany = input.nextInt();
HomeLoan[] hLoans = new HomeLoan[hHowMany];
int z=0;
while (hHowMany>z)
{
hLoans[z] = new HomeLoan(name, custID);
z++;
}
break;
case "c": System.out.println("You selected Car Loan");
System.out.println("How many Car Loans would you like to enter?");
cHowMany = input.nextInt();
int x=0;
CarLoan[] carLoans = new CarLoan[cHowMany];
while (x<cHowMany)
{
System.out.print("Enter Loan ID: ");
loanID=0;
do
{
try
{
loanID=input.nextInt();
}
catch (InputMismatchException e)
{
System.out.println("Loan IDs are number only");
input.next();
}
}while (loanID<1);
boolean b=true;
while(b)
{
System.out.print("Enter term: ");
term=input.nextInt();
boolean t = CarLoan.termCorrect(term);
if(t){System.out.println("Error: Maximum of 6 year");}
else {b=false; System.out.println("You entered: " + term + " years");}
}
carLoans[x] = new CarLoan(name, custID, loanID, term);
x++;
}
break;
default: System.out.println("Invalid input");
break;
}
System.out.print("Would you like to enter another loan?");
System.out.print("(y)es or (n)o:");
String m = input.next();
System.out.println("");
switch (m)
{
case "y": break;
case "n": aa=false;
break;
default: System.out.print("Invalid entry");
}
}
printHLoans(hLoans);
System.out.println("Thank you for using Loan Software");
System.out.println("Have a nice day");
}
public static void printHLoans(HomeLoan hLoans[])
{
System.out.println("Here are the loans you entered . . .");
int zzz=0;
while (zzz<hHowMany)
{
term = hLoans[zzz].getTerm();
loanID=hLoans[zzz].getLoanID();
String address=hLoans[zzz].getAddress();
double loanAmount = hLoans[zzz].getLoanAmount();
System.out.print(zzz + ": ");
System.out.print(hLoans[zzz].toString(loanID, address, term, loanAmount));
System.out.println();
zzz++;
}
}
}
HomeLoan Class
import java.util.InputMismatchException;
import java.util.Scanner;
public class HomeLoan extends Loan
{
private String address;
int howMany;
private double loanAmount;
private int term;
private int loanID;
public HomeLoan()
{
}
public HomeLoan(String name, int custID)
{
//super(name, custID, loanID);
Scanner input = new Scanner (System.in);
System.out.print("Enter Loan ID: ");
loanID=0;
do
{
try
{
loanID=input.nextInt();
}
catch (InputMismatchException e)
{
System.out.println("Loan IDs are number only");
input.next();
}
}while (loanID<1);
boolean l=true;
while (l)
{
System.out.print("Enter term: ");
term=input.nextInt();
boolean s = HomeLoan.termCorrect(term);
if (s){System.out.println("Error: Maximum of 30 years");}
else {l=false;}
}
//System.out.println();
input.nextLine();
System.out.print("Enter your address: ");
address=input.nextLine();
System.out.print("Enter loan ammount: ");
loanAmount = input.nextDouble();
double annualInterest = 10.99;
double monthlyPayment = amortization(loanAmount, annualInterest, term);
double newBalance=payment(monthlyPayment, loanAmount);
//System.out.println("Payment: " + monthlyPayment);
//System.out.println("New balance after payment: " + newBalance);
}
public static boolean termCorrect(int term)
{
boolean a;
if (term>30) {a=true; return a;}
else {a=false; return a;}
}
public String toString(String name, int custID, int loanID)
{
String display = "Name: " + name + " Customer ID: " + custID + " Address: "+ address+ " Loan ID: " + loanID + " Loan Amount: $" + loanAmount
+ " Current Balance: $";
return display;
}
public String getAddress()
{
return address;
}
public double getLoanAmount()
{
return loanAmount;
}
public int getTerm()
{
return term;
}
public int getLoanID()
{
return loanID;
}
public String toString(int loanID, String address, int term, double loanAmmount)
{
String displa = "ID: " + loanID + " Address:" + address + " Term: " + term + " Loan Ammount: " + loanAmmount;
return displa;
}
private void equals()
{
}
public void printHLoans(HomeLoan hLoans[], int xxx)
{
}
}
How do I make this work?

That's because you've declared the HomeLoan[] hLoans = new HomeLoan[hHowMany]; within the while loop and are trying to access it after that. That's why once the while loop is over, the hLoans goes out of scope. In your case, its more specifically within the case "h" of the switch, which further narrows down the scope of hLoans to just within it.
To be able to access it outside the while, you need to declare it at a scope higher than the while. Do something like this.
HomeLoan[] hLoans; // Before while
while(aa) {
...
switch..
case "h": hLoans = new HomeLoan[hHowMany];
}
printHLoans(hLoans);