我的程序要求用户创建一个银行帐户。目前它只能创建一个帐户并将其打印出来。我想扩展我的程序，以便通过反复选择菜单选项创建多个帐户，最后打印所有帐户详细信息。
package bankapp_assignment;
import java.util.Scanner;
public class BankApp_Assignment {
public static void main(String[] args) {
BankAccount[] accounts = new BankAccount[10];
Scanner sc = new Scanner(System.in);
int userChoose;
String name = null;
int accNum = 0;
double initiateAmount = 0;
double newAmm = 0;
double depOrWith = 0;
System.out.println("WELCOME TO OUR BANK!\n\n"
+ "...................\n"
+ "...................\n\n"
+ "Choose your optiin:\n"
+ "1. Create new account\n"
+ "2. View all the accounts property\n"
+ "3. Quit\n\n");
System.out.println("*************\n"
+ "************");
while (true) {
userChoose = sc.nextInt();
sc.nextLine();
if (userChoose == 1) {
/*the user must be able to create multiple accounts, let's say 10 accounts for instance
To open another new account the user should choose the menu option "1" again and continue...
*/
System.out.println("Enter your full name:");
name = sc.nextLine();
System.out.println("Choose an account number:");
accNum = sc.nextInt();
System.out.println("Enter an initiating amount:");
initiateAmount = sc.nextDouble();
System.out.println("\n-----------\n"
+ "------------");
} else if (userChoose == 2) {//view all the accounts property (including account number and initial balance)
} else if (userChoose == 3) {
System.exit(0);
}
}
}
}
的BankAccount：
package bankapp_assignment;
public class BankAccount {
public void createAcc(){
}
}
在Naman回答之后编辑：
public static void main(String[] args) {
BankAccount[] accounts = new BankAccount[10];
Scanner sc = new Scanner(System.in);
int userChoose;
String name = null;
int accNum = 0;
double initiateAmount = 0;
double newAmm = 0;
double depOrWith = 0;
System.out.println("WELCOME TO OUR BANK!\n\n"
+ "...................\n"
+ "...................\n\n"
+ "Choose your optiin:\n"
+ "1. Create new account\n"
+ "2. View all the accounts property\n"
+ "3. Quit\n\n");
System.out.println("*************\n"
+ "************");
while (true) {
userChoose = sc.nextInt();
sc.nextLine();
if (userChoose == 1) {
/*the user must be able to create multiple accounts, let's say 10 accounts for instance
To open another new account the user should choose the menu option "1" again and continue...
*/
System.out.println("Enter your full name:");
name = sc.nextLine();
System.out.println("Choose an account number:");
accNum = sc.nextInt();
System.out.println("Enter an initiating amount:");
initiateAmount = sc.nextDouble();
System.out.println("\n-----------\n"
+ "------------");
accounts[numOfAcc]=bankAcc;
numOfAcc++;
} else if (userChoose == 2) {//view all the accounts property (including account number and initial balance)
for(BankAccount bankAccount: accounts){
System.out.println("Your name: " + name);
System.out.println("Your account number: " + accNum);
System.out.println("Your current balance: " + initiateAmount);
System.out.println("\n-----------\n"
+ "------------");
}
} else if (userChoose == 3) {
System.exit(0);
}
}
}
}
答案 0 :(得分：2)
如果你想继续使用数组，那么你可以先做静态变量：
static int number = 0;
更改您的区块如下：
if (userChoose == 1) {
BankAccount ac = new BankAccount();
//set account properties;
accounts[number] = ac;
number++;
}
您可以检索如下数组：
for(BankAccount bankAccount: accounts){
//bankAccount.getProperty();
}
您的代码应该像
BankAccount bankAcc = null;
if (userChoose == 1) {
bankAcc = new BankAccount();
/*the user must be able to create multiple accounts, let's say 10 accounts for instance
To open another new account the user should choose the menu option "1" again and continue...
*/
System.out.println("Enter your full name:");
name = sc.nextLine();
bankAcc.setName(name);//setter method of your bankAccount bean
System.out.println("Choose an account number:");
accNum = sc.nextInt();
bankAcc.setAccountNum(accNum);
System.out.println("Enter an initiating amount:");
initiateAmount = sc.nextDouble();
bankAcc.setInitialAmount(initialAmount);
System.out.println("\n-----------\n"
+ "------------");
accounts[numOfAcc]=bankAcc;
numOfAcc++;
}
检索如下：
else if (userChoose == 2) {//view all the accounts property (including account number and initial balance)
for(BankAccount bankAccount: accounts){
System.out.println("Your name: " + bankAccount.getName());
System.out.println("Your account number: " + bankAccount.getAccountNum());
System.out.println("Your current balance: " + bankAccount.getInitialAmount());
System.out.println("\n-----------\n"
+ "------------");
}
答案 1 :(得分：1)
1）创建一个对象类：例如
class BankAccount{
private String userName;
private String userSurname;
private String birthDay;
private int accountNumber;
private int ibanNo;
private int balance;
public BankAccount(String userName, String userSurname, String birthDay, int accountNumber, int ibanNo, int balance) {
super();
this.userName = userName;
this.userSurname = userSurname;
this.birthDay = birthDay;
this.accountNumber = accountNumber;
this.ibanNo = ibanNo;
this.balance = balance;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getUserSurname() {
return userSurname;
}
public void setUserSurname(String userSurname) {
this.userSurname = userSurname;
}
public String getBirthDay() {
return birthDay;
}
public void setBirthDay(String birthDay) {
this.birthDay = birthDay;
}
public int getAccountNumber() {
return accountNumber;
}
public void setAccountNumber(int accountNumber) {
this.accountNumber = accountNumber;
}
public int getIbanNo() {
return ibanNo;
}
public void setIbanNo(int ibanNo) {
this.ibanNo = ibanNo;
}
public int getBalance() {
return balance;
}
public void setBalance(int balance) {
this.balance = balance;
}
}
2）在主类中使用此对象创建一个全局List;
List<BankAccount> accounts = new ArrayList<BankAccount>();
3）现在您可以在列表中添加新帐户;
accounts.add(new BankAccount(String userName, String userSurname, String birthDay, int accountNumber, int ibanNo, int balance));
4）现在，您可以使用帐户列表添加/获取/删除帐户。
答案 2 :(得分：1)
创建银行帐户详细信息的对象，然后只需添加到ArrayList 使用java.util包中的ArrayList数据类型 创建一个包含银行帐户详细信息的类，只需将其导入此类并编写以下代码
即可List <BankAccount> accounts = new <BankAccount> ArrayList();
BankAccount object = new BankAccount();
//Set field here like
System.out.println("Enter your full name:");
name = sc.nextLine();
System.out.println("Choose an account number:");
accNum = sc.nextInt();
System.out.println("Enter an initiating amount:");
initiateAmount = sc.nextDouble();
在那之后简单使用
accounts.add(object);
在这种情况下存储通用数据类型或对象是完美的， 还可以使用if -then- else块上的switch case来实现其可读性和方便性
还使用enhaced for循环来查看帐户
for(BankAccount account:accounts){
System.out.println("ALL DETAILS FROM OBJECT");
}
答案 3 :(得分：1)
包含工作回答
的完整代码package tester;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
public class BankApp {
static class BankAccount {
private String name;
private int accNum;
private double initiateAmount;
public BankAccount() {
this.name = null;
this.accNum = 0;
this.initiateAmount = 0;
}
public void setAccNum(int accNum) {
this.accNum = accNum;
}
public void setInitiateAmount(double initiateAmount) {
this.initiateAmount = initiateAmount;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return name + "\t" + accNum + "\t" + initiateAmount;
}
}
public static void main(String[] args) {
List<BankAccount> bankAccounts = new ArrayList<BankAccount>();
Scanner sc = new Scanner(System.in);
while(true){
System.out.println("WELCOME TO OUR BANK!\n\n"
+ "Choose your option:\n"
+ "1. Create new account\n"
+ "2. View all the accounts property\n"
+ "3. Quit\n");
int option = sc.nextInt();
sc.nextLine();
switch(option){
case 1:
BankAccount account = new BankAccount();
System.out.println("Enter your full name:");
account.setName(sc.nextLine());
System.out.println("Choose an account number:");
account.setAccNum(sc.nextInt());
System.out.println("Enter an initiating amount:");
account.setInitiateAmount(sc.nextDouble());
bankAccounts.add(account);
break;
case 2:
System.out.println("Name\tAcc No\tAmount");
for (BankAccount bankAccount : bankAccounts) {
System.out.println(bankAccount);
}
System.out.println("\n\n");
break;
case 3:
return;
}
}
}
}
如果您希望BankAccount处于单独的文件中，请执行以下操作。
档案BankAccount.java
public class BankAccount {
...
...
}