Java ArrayList银行帐户
因此,我正在创建一个使用ArrayList的银行帐户程序。该程序显示一个菜单,客户可以在其中存款、取款、显示帐户信息和检查余额。数组列表存储客户对象,并且在用户存款/取款等情况下应该能够更新 到目前为止,我还不确定如何调用Customer类中的存款、取款、显示帐户信息和检查余额的方法,并让它们正确访问数组列表对象 任何关于我所缺少的东西的帮助或建议都会非常有用 我现在遇到的错误是:找不到符号 符号:变量customerID 位置:display and balance方法中所有变量的java.util.ArrayList类 找不到符号 符号:构造函数客户() 位置:类taylor.Customer当我尝试创建客户实例时 当我试图调用方法并传入数组列表帐户时,taylor.Customer中的display(java.util.ArrayList)不能应用于(taylor.Customer) 测试仪等级:Java ArrayList银行帐户,java,class,arraylist,account,bank,Java,Class,Arraylist,Account,Bank,因此,我正在创建一个使用ArrayList的银行帐户程序。该程序显示一个菜单,客户可以在其中存款、取款、显示帐户信息和检查余额。数组列表存储客户对象,并且在用户存款/取款等情况下应该能够更新 到目前为止,我还不确定如何调用Customer类中的存款、取款、显示帐户信息和检查余额的方法,并让它们正确访问数组列表对象 任何关于我所缺少的东西的帮助或建议都会非常有用 我现在遇到的错误是:找不到符号 符号:变量customerID 位置:display and balance方法中所有变量的java.u
package taylor;
import java.util.ArrayList;
import java.util.Scanner;
public class TestBank{
public static void main(String args[]){
ArrayList<Customer> accounts = new ArrayList<Customer>();
Customer customer1 = new Customer(1, "Savings", "US Dollars", 800);
Customer customer2 = new Customer(2, "Checking", "Euro", 1900);
Customer customer3 = new Customer(3, "Checking", "US Dollars", 8000);
accounts.add(customer1);
accounts.add(customer2);
accounts.add(customer3);
int customerID=4;
String choice;
int deposit;
int withdraw;
Scanner in = new Scanner(System.in);
Customer operation = new Customer();
boolean flag = true;
String accountType;
String currencyType;
int balance;
while(flag){
System.out.println("Select a choice:");
System.out.println("1. Existing customer");
System.out.println("2. New customer");
System.out.println("3. Quit");
String input = in.next();
//existing user
if(input.equals("1")){
System.out.println("Enter CustomerID: ");
customerID = in.nextInt();
System.out.println("Would you like to: ");
System.out.println("1. Deposit ");
System.out.println("2. Withdraw ");
System.out.println("3. Display account info ");
System.out.println("4. Check balance ");
choice = in.next();
if(choice.equals("1")){
System.out.println("How much would you like to deposit?");
deposit = in.nextInt();
operation.deposit(deposit);
}
else if (choice.equals("2")){
System.out.println("How much would you like to withdraw?");
withdraw = in.nextInt();
operation.withdraw(withdraw);
}
else if (choice.equals("3")){
operation.display(accounts.get(customerID));
}
else if (choice.equals("4"))
operation.balance(accounts.get(customerID));
else
System.out.println("Invalid");
}
//new user
else if(input.equals("2")){
//add new user to arraylist
int newID = customerID + 1;
System.out.println("Enter account type: ");
accountType = in.next();
System.out.println("Enter currency type: ");
currencyType = in.next();
System.out.println("Enter initial balance: ");
balance = in.nextInt();
System.out.println("Your customer ID will be: " + newID);
accounts.add(new Customer(newID, accountType, currencyType, balance));
}
else if(input.equals("3")){
System.out.println("Thanks for using this bank!");
flag = false;
}
else{
System.out.println("Invalid");
}
}
}
}
package;
导入java.util.ArrayList;
导入java.util.Scanner;
公共类测试库{
公共静态void main(字符串参数[]){
ArrayList accounts=新的ArrayList();
客户1=新客户(1,“储蓄”,“美元”,800);
客户2=新客户(2,“支票”,“欧元”,1900);
客户3=新客户(3,“支票”,“美元”,8000);
账户。添加(客户1);
账户。添加(客户2);
账户。添加(客户3);
int customerID=4;
字符串选择;
内部存款;
int退出;
扫描仪输入=新扫描仪(系统输入);
客户操作=新客户();
布尔标志=真;
字符串帐户类型;
字符串类型;
国际收支平衡;
while(旗帜){
System.out.println(“选择一个选项:”);
System.out.println(“1.现有客户”);
System.out.println(“2.新客户”);
System.out.println(“3.Quit”);
字符串输入=in.next();
//现有用户
如果(输入等于(“1”)){
System.out.println(“输入CustomerID:”);
customerID=in.nextInt();
System.out.println(“您想:”);
系统输出打印(“1.存款”);
系统输出打印项次(“2.收回”);
System.out.println(“3.显示账户信息”);
系统输出打印项次(“4.检查余额”);
choice=in.next();
if(选择等于(“1”)){
System.out.println(“您想存多少?”;
存款=in.nextInt();
经营.押金(押金);
}
else if(选择等于(“2”)){
System.out.println(“您想提取多少?”);
撤回=在.nextInt()中;
操作。撤回(撤回);
}
else if(选择等于(“3”)){
操作.显示(accounts.get(customerID));
}
else if(选择等于(“4”))
操作.余额(accounts.get(customerID));
其他的
System.out.println(“无效”);
}
//新用户
else if(输入等于(“2”)){
//将新用户添加到arraylist
int newID=customerID+1;
System.out.println(“输入帐户类型:”);
accountType=in.next();
System.out.println(“输入货币类型:”);
currencyType=in.next();
System.out.println(“输入初始余额:”);
余额=in.nextInt();
System.out.println(“您的客户ID将是:“+newID”);
accounts.add(新客户(newID,accountType,currencyType,balance));
}
else if(输入等于(“3”)){
System.out.println(“感谢使用此银行!”);
flag=false;
}
否则{
System.out.println(“无效”);
}
}
}
}
客户类别:
package taylor;
import java.util.Scanner;
import java.util.ArrayList;
public class Customer{
String accountType, currencyType, info;
int customerID, balance, amount;
Scanner input = new Scanner(System.in);
public Customer(int customerID, String accountType, String currencyType, int balance){
this.accountType = accountType;
this.currencyType = currencyType;
this.customerID = customerID;
this.balance = balance;
this.amount = amount;
}
public int deposit(int amount){
amount = input.nextInt();
if (amount >= 500) {
System.out.println("Invalid");
}
else{
balance = balance + amount;
}
return balance;
}
public int withdraw(int amount){
if (balance < amount) {
System.out.println("Invalid amount.");
}
else if (amount >= 500) {
System.out.println("Invalid");
}
else {
balance = balance - amount;
}
return balance;
}
public void display(ArrayList<Customer> accounts) {
System.out.println("CustomerID:" + accounts.customerID);
System.out.println("Account Type:" + accounts.accountType);
System.out.println("Currency Type: " + accounts.currencyType);
System.out.println("Balance:" + accounts.balance);
}
public void balance(ArrayList<Customer> accounts) {
System.out.println("Balance:" + accounts.balance);
}
}
package;
导入java.util.Scanner;
导入java.util.ArrayList;
公共类客户{
字符串accountType、currencyType、info;
int customerID、余额、金额;
扫描仪输入=新扫描仪(System.in);
公共客户(int customerID、字符串accountType、字符串currencyType、int balance){
this.accountType=accountType;
this.currencyType=currencyType;
this.customerID=customerID;
这个平衡=平衡;
这个。金额=金额;
}
公共整数存款(整数金额){
amount=input.nextInt();
如果(金额>=500){
System.out.println(“无效”);
}
否则{
余额=余额+金额;
}
收益余额;
}
公共整数取款(整数金额){
如果(余额<金额){
System.out.println(“无效金额”);
}
否则,如果(金额>=500){
System.out.println(“无效”);
}
否则{
余额=余额-金额;
}
收益余额;
}
公共作废显示(ArrayList帐户){
System.out.println(“CustomerID:+accounts.CustomerID”);
System.out.println(“账户类型:“+accounts.accountType”);
System.out.println(“货币类型:“+账户.currencyType”);
System.out.println(“余额:+账户.余额”);
}
公共无效余额(ArrayList账户){
System.out.println(“余额:+账户.余额”);
}
}
问题是您从未初始化BankAccount中的任何字段。从BankAccount构造函数中删除void
,使其成为构造函数,并在TestBank中构建类时使用该构造函数
由于这些字段与Customer中的字段重复,因此最好执行类似于Customer.deposit(amount)
等操作。删除BankAccount类,将方法移动到Customer,并将参数int amount
添加到使用amount的方法中。然后在TestBank类中更改deposit等方法调用,使其具有amount参数
而且,