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大家好我想通過一個數組使用4個字母的密碼和4個int數字的ID來循環訪問。通過arraylist循環
到目前爲止，我可以創建兩個'鑰匙'，但我無法讓他們搜索陣列列表上的帳戶，儘管它是創建的。我真的不知道如何解決這個問題，因爲唯一的方法似乎是隻需要一個'If'語句或開關。
這裏是我的代碼設置：
int acctID;
int depositingAmount;
//System.out.println("Input your ID and then your password to deposit money.");
String inputID = JOptionPane.showInputDialog("Please input your ID to begin depositing money.");
acctID = Integer.parseInt(inputID);
String inputPassword = JOptionPane.showInputDialog("Please input your password to verify your account.");
// int depositAmount;
// do {
for (int i = 0; i < bankAccounts.size(); i++)//Loops through accounts in my arraylist.
{
if (acctID == bankAccounts.get(i).getAccountId() && inputPassword == bankAccounts.get(i).getPassword())//If ID and password work are true then it goes in here.
{
String depositAmount = JOptionPane.showInputDialog("Please input how much money you want to "
+ "input");//An here is where you would be able to spit out how much money to deposit.
depositingAmount = Integer.parseInt(depositAmount);
bankAccounts.get(i).deposit(depositingAmount);
break;
}
}
就像你可以看到在理論上環路假設去「哦，沒事讓我開始去雖然列表中的所有賬戶，直到我找到你的「，當它發現」哦，我找到了你的賬戶，在這裏讓我給你存款功能「。對不起，如果我試圖簡化它在這個段落太多，只是這個問題令我感到沮喪，因爲我知道如果我能解決這個問題，那麼我的項目的其餘部分就完成了。我也有一個退出功能，但這基本上是一樣的，但在同一個班上玩不同的方法。
編輯：這裏是構造
public BankAccount() {//ADDED TWO PARAMETERS
//NO ARGUMENT CONSTRUCTOR
accountId = (int) (Math.random() * 9000) + 999;
//RANDBETWEEN
setAccountBalance(0);
Random passcode = new Random();
//char charcs = (char)(passcode.nextInt(26) + 'a');
//Added string.
String chars = "abcdefghijklmnopqrstuvwxyz";
int length = chars.length();
for (int i = 0; i < 4; i ++){
password += chars.split("")[ (int) (Math.random() * (length - 1)) ];}
}
public BankAccount(double accountBalance) { // ONE ARGUMENT CONSTRUCTOR
accountId = (int) (Math.random() * 9000) + 1000;
setAccountBalance(accountBalance);
//Random passcode = new Random();
//password = (String) (passcode.nextInt(26)) + 'a';
//NEED A VARIABLE TO PASS IN
//4 Digit password
String chars = "abcdefghijklmnopqrstuvwxyz";
int length = chars.length();
for (int i = 0; i < 4; i ++){
password += chars.split("")[ (int) (Math.random() * (length - 1)) ];}
}
的這裏是干將..
public int getAccountId() {
return accountId;
}
public String getPassword() {
return password;
}
而且，這裏是我創建的領域..
private int accountId;
private double accountBalance;
private static double annualInterestRate = 0.045;
private static java.util.Date dateCreated = new java.util.Date();
private String name;
private String password = "";
這裏是哪裏我站在If語句
if (acctID == bankAccounts.get(i).getAccountId() && inputPassword.equals(bankAccounts.get(i).getPassword()))
我已經看到已發佈的其他線程有類似的問題，但他們只是把.equals（）的答案是不夠的。除非我花錢從銀行賬戶中取出銀行賬戶。
編輯2：整個代碼。
import java.util.Random;
public class BankAccount {
private int accountId;
private double accountBalance;
private static double annualInterestRate = 0.045;
private static java.util.Date dateCreated = new java.util.Date();
private String name;
private String password = "";
public BankAccount() {//ADDED TWO PARAMETERS
//NO ARGUMENT CONSTRUCTOR
accountId = (int) (Math.random() * 9000) + 999;
//RANDBETWEEN
setAccountBalance(0);
Random passcode = new Random();
//char charcs = (char)(passcode.nextInt(26) + 'a');
//Added string.
String chars = "abcdefghijklmnopqrstuvwxyz";
int length = chars.length();
for (int i = 0; i < 4; i ++){
password += chars.split("")[ (int) (Math.random() * (length - 1)) ];}
}
public BankAccount(double accountBalance) { // ONE ARGUMENT CONSTRUCTOR
accountId = (int) (Math.random() * 9000) + 1000;
setAccountBalance(accountBalance);
//Random passcode = new Random();
//password = (String) (passcode.nextInt(26)) + 'a';
//NEED A VARIABLE TO PASS IN
//4 Digit password
String chars = "abcdefghijklmnopqrstuvwxyz";
int length = chars.length();
for (int i = 0; i < 4; i ++){
password += chars.split("")[ (int) (Math.random() * (length - 1)) ];}
}
public int getAccountId() {
return accountId;
}
public double getAccountBalance() {
return accountBalance;
}
public void setAccountBalance(double accountBalance) {
this.accountBalance = accountBalance;
}
public double getAnnualInterestRate() {
return annualInterestRate;
}
public void setAnnualInterestRate(double annualInterestRate) {
this.annualInterestRate = annualInterestRate;
}
public void withdraw(double amountToWithdraw) {
if (amountToWithdraw > accountBalance) {
//putting together withdraw make sure to have a validation to stop ppl from going over.
System.out.println("Sorry you cannot exceed the amount you have in your balance.");
}
else {
accountBalance = accountBalance - amountToWithdraw;
}
}
public void deposit(double amountToDeposit) {
if (amountToDeposit < 0) {
//deposits cannot be negative
System.out.println("You cannot deposit a negative amount of dallars.");
}
else {
accountBalance = accountBalance + amountToDeposit;
}
}
public double getMonthlyInterestRate() {
int MonthsInAYear = 12;//method variable is small BUT just need to get results
double monthlyInterestRate = annualInterestRate/MonthsInAYear;
return monthlyInterestRate;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String toString(){
String bankInfo = " Password: " + getPassword() + " Account ID: " + getAccountId();
return bankInfo;
}
}
public class CurrentAccount extends BankAccount{
private static float overdraftLimit = 100;
CurrentAccount(){
super();
}
public static float getOverdraftLimit() {
return overdraftLimit;
}
// MAKE A SETTER FOR THE OVERDRAFTLIMIT
public void withdraw(double amountToWithdraw){
if (amountToWithdraw <= getAccountBalance()+overdraftLimit) {
setAccountBalance(getAccountBalance() - amountToWithdraw);
}
else {
System.out.println("Error this transaction has been cancelled.");
}
}
}
public class SavingsAccount extends BankAccount{
private static double interest;
public SavingsAccount(){
super();
interest = 0;
}
public void addInterest(){
interest = getAccountBalance() * getMonthlyInterestRate(); //GETTING ZEROS FROM ACCOUNTBALANCE
//CHANGE getAccountBalance with some other initial payment.
super.deposit(interest);
}
public double getInterest() {
return interest;
}
public void setInterest(float interest) {
this.interest = interest;
}
}
public class Bank {
Scanner input = new Scanner(System.in);
Scanner Restart = new Scanner(System.in);
private static ArrayList<BankAccount> bankAccounts; // MADE THIS STATIC
public Bank() {
bankAccounts = new ArrayList<BankAccount>();
}
public void openAccount() {
Object[] possibilities = {"Regular Account", "Savings Account", "Checking Account"};
Object inputValue = JOptionPane.showInputDialog(null, "Please pick an option from this menu: ",
"input", JOptionPane.INFORMATION_MESSAGE, null, possibilities, possibilities [0]);
if (inputValue.equals("Regular Account")) {
// Make a regular acct
String inputName = JOptionPane.showInputDialog(null, "Please input your name");
BankAccount newBankAccount = new BankAccount();
newBankAccount.setName(inputName);
bankAccounts.add(newBankAccount);
JOptionPane.showMessageDialog(null, "Account ID: " + newBankAccount.getAccountId());
JOptionPane.showMessageDialog(null, "Account Password: " + newBankAccount.getPassword());
} else if (inputValue.equals("Savings Account")) {
// Make a savings acct
String inputNameSavings = JOptionPane.showInputDialog(null, "Please input your name");
BankAccount newBankAccount = new SavingsAccount();
newBankAccount.setName(inputNameSavings);
bankAccounts.add(newBankAccount);
JOptionPane.showMessageDialog(null, "Account ID: " + newBankAccount.getAccountId());
JOptionPane.showMessageDialog(null, "Account Password: " + newBankAccount.getPassword());
} else if (inputValue.equals("Checking Account")) {
// Make a checking acct
String inputNameChecking = JOptionPane.showInputDialog(null, "Please input your name");
BankAccount newBankAccount = new CurrentAccount();
newBankAccount.setName(inputNameChecking);
bankAccounts.add(newBankAccount);
JOptionPane.showMessageDialog(null, "Account ID: " + newBankAccount.getAccountId());
JOptionPane.showMessageDialog(null, "Account Password: " + newBankAccount.getPassword());
}
}
public static ArrayList<BankAccount> getBankAccounts() {
return bankAccounts;//Moving this into the Open.Account?
}
public void closeAccount() {
System.out.println("Hello give me the name of the" + " "
+ "account you would like to close.");
String userName = input.next();// Gets input for first choice.
// Ask for account id
System.out.println("Please input your account ID");
int userAccountId = input.nextInt();
for (int i = 0; i < bankAccounts.size(); i++) {
if (bankAccounts.get(i).getName().equals(userName)
&& bankAccounts.get(i).getAccountId() == userAccountId) {
bankAccounts.remove(i);
System.out.println("Account removed");
}
}
// anyway, you would set the name probably in the constructor function
// for that particular instantiation of the class
}
public void update() {
// UPDATES MY ACCOUNTS
for (int i = 0; i < bankAccounts.size(); i++) {
if (bankAccounts.get(i) instanceof SavingsAccount) {
((SavingsAccount) bankAccounts.get(i)).addInterest();
} else if (bankAccounts.get(i) instanceof CurrentAccount) {
if (bankAccounts.get(i).getAccountBalance() < 0) {
System.out.println("\nThe Account: " + bankAccounts.get(i).getName() + " has been OverDrafted.\n");
}
}
}
}// ends update
public void withdraw(){
System.out.println("Input your ID and then your password to withdraw money.");
int acctID = input.nextInt();
int withdrawAmount;
// do {
for (int i = 0; i < bankAccounts.size(); i++){
//input needed.
if (acctID == bankAccounts.get(i).getAccountId()){
System.out.println("We have found your account. Please input how much money you would like to withdraw.");
withdrawAmount = input.nextInt();
bankAccounts.get(i).withdraw(withdrawAmount);
break;
}
// } while (input != 1);
}
}
public void deposit(){
int acctID;
int depositingAmount;
//System.out.println("Input your ID and then your password to deposit money.");
String inputID = JOptionPane.showInputDialog("Please input your ID to begin depositing money.");
acctID = Integer.parseInt(inputID);
String inputPassword = JOptionPane.showInputDialog("Please input your password to verify your account.");
// int depositAmount;
// do {
for (int i = 0; i < bankAccounts.size(); i++)//Loops through accounts in my arraylist.
{
if (acctID == bankAccounts.get(i).getAccountId() && inputPassword.equals(bankAccounts.get(i).getPassword()))//If ID and password work are true then it goes in here.
{
String depositAmount = JOptionPane.showInputDialog("Please input how much money you want to "
+ "input");//An here is where you would be able to spit out how much money to deposit.
depositingAmount = Integer.parseInt(depositAmount);
bankAccounts.get(i).deposit(depositingAmount);
break;
}
}
}
}
的最後我跑它的類...
import java.util.ArrayList;
import javax.swing.JOptionPane;
public class TestBankAccount {
public static void main(String[] args) {
// JOptionPane.showMessageDialog(null, "Hello User.");
Object[] menuPossibilities = {"Create a New Account", "Deposit", "Withdraw", "Display Balance", "Exit"};
Object menuValues = JOptionPane.showInputDialog(null, "Please pick an option from this menu: ",
"input", JOptionPane.INFORMATION_MESSAGE, null, menuPossibilities, menuPossibilities [0]);
while (!menuValues.equals("Exit")){
Bank newBank = new Bank();
// Bank newBank1 = new Bank();
// Bank newBank2 = new Bank(); Do the same thing as below but switch out
// bank1 and bank2 as a substitute.
ArrayList<BankAccount> bankList = newBank.getBankAccounts();
if (menuValues.equals("Create a New Account")){
newBank.openAccount();
}
else if (menuValues.equals("Deposit")){
newBank.deposit();
}
else if (menuValues.equals("Withdraw")){
newBank.withdraw();
}
else if (menuValues.equals("Display Balace")){
newBank.deposit();
}
else if (menuValues.equals("Exit")){
System.out.println("Thank you for using our service.");
}
menuValues = JOptionPane.showInputDialog(null, "Since you did not pick 5 please pick another option: ",
"input", JOptionPane.INFORMATION_MESSAGE, null, menuPossibilities, menuPossibilities [0]);
}
}
}
什麼問題？爲了清楚起見請重新修改。 – AMACB
@AMACB - 是的，他需要提供整個代碼和遇到的問題！ – CodeWalker
問題是：我無法在數組中循環並進入if語句以進行存款。我嘗試了下面的方法，並在賬戶無效時點擊所有鍵。 @AMACB –