我通过以另一种方式重新编写应用程序来修复重复错误，但现在卡在试试catch上，不让用户输入不设防的条目，只是让他在我的交换机案例中添加有效数字
import java.util.Scanner;
public class BankSystem {
private Account acc;
Scanner Input;
public BankSystem() {
this.acc = new Account(100);
Input = new Scanner(System.in);
}
public static void main(String[] args) {
BankSystem bs = new BankSystem();
bs.main();
}
public void main() {
while (true) {
try {
System.out.println("==========================");
System.out.println("========Main Menu=========");
System.out.println("Please Enter Your Choice: ");
System.out.println("1=> Main");
System.out.println("2=> New Account");
System.out.println("3=> Deposit Money");
System.out.println("4=> Withdraw Money");
System.out.println("5=> Personal Balance");
System.out.println("6=> Money Transfer");
System.out.println("7=> Full Customer Report:");
System.out.println("8=> Delete Account");
System.out.println("9=> Calculate Interest");
System.out.println("0=> Exit");
System.out.print("=> ");
int Choice = Input.nextInt();
switch (Choice) {
case 1:
main();
break;
case 2:
addAccount();
break;
case 3:
depositMoney();
break;
case 4:
withdrawMoney();
break;
case 5:
personalBalance();
break;
case 6:
transferMoney();
break;
case 7:
fullReport();
break;
case 8:
deleteAccount();
break;
case 9:
break;
case 0:
System.out
.println("Thanks For Using this App we're Looking forward to see You Again :)");
System.exit(0);
break;
default:
System.out.println("Entry is not valid.\n");
break;
}
} catch (Exception e) {
System.out.println("================================");
System.err.println("! You Have Entered Wrong Value !");
System.out.println("================================");
// break;
}
}
}
private void addAccount() {
System.out.println("Enter The Account Number:");
int acc = Input.nextInt();
System.out.println("Enter The Account First Name:");
String name = Input.next();
System.out.println("Enter The Account Last Name:");
String Sname = Input.next();
System.out.println("Enter The Amount:");
double bal = Input.nextDouble();
Customer cust = new Customer(acc, name, Sname, bal);
this.acc.insert(cust);
}
private void depositMoney() {
System.out.println("Enter Account Number:");
int acc = Input.nextInt();
System.out.println("Enter The Amount:");
double amount = Input.nextDouble();
if (amount <= 0)
System.out.println("The amount can not be negative or zero.");
else
this.acc.depositMoney(acc, amount);
}
private void withdrawMoney() {
System.out.println("Enter Account Number:");
int acc = Input.nextInt();
System.out.println("Enter The Amount:");
double amount = Input.nextDouble();
if (amount <= 0)
System.out.println("The amount can not be negative or zero.");
else
this.acc.withdrawMoney(acc, amount);
}
private void transferMoney() {
System.out.println("Enter The Sender Account Number:");
int fromAcc = Input.nextInt();
System.out.println("Enter The Receiver Account Number:");
int toAcc = Input.nextInt();
System.out.println("Enter The Amount:");
double amount = Input.nextDouble();
this.acc.transferMoney(fromAcc, toAcc, amount);
}
private void personalBalance() {
System.out.println("Enter The Account Number:");
int acc = Input.nextInt();
this.acc.personalDisplay(acc);
}
private void deleteAccount() {
System.out.println("Enter The Account Number:");
int acc = Input.nextInt();
this.acc.delete(acc);
}
private void fullReport() {
this.acc.displayList();
}
}
class Customer {
private int accNum;
private String name;
private String Sname;
private double balance;
public Customer(int a, String n, String Sn, double amount) {
accNum = a;
name = n;
Sname = Sn;
balance = amount;
}
public String getname() {
return name;
}
public String getSname() {
return Sname;
}
public int getaccNum() {
return accNum;
}
public double getBalance() {
return balance;
}
public void personalDisplay() {
System.out.println(this.getname() + " " + this.getSname()
+ "'s balance is " + this.getBalance());
}
public void deposit(double amount) {
if (amount <= 0)
System.out.println("The amount must be bigger than zero.");
else
this.balance += amount;
}
public void display() {
System.out.println(this.getaccNum() + "\t" + this.getname() + "\t"
+ this.getSname() + "\t" + this.getBalance());
}
public void withdraw(double amount) {
if (this.balance >= amount)
this.balance -= amount; // Subtract "amount" from balance
}
}
class Account {
private Customer[] Array;
private int nElem;
public Account(int max) {
Array = new Customer[max];
nElem = 0;
}
public boolean find(int data) {
int LowBoun = 0;
int HighBoun = nElem;
int Now;
while (true) {
Now = (LowBoun + HighBoun) / 2;
if (Array[Now].getaccNum() == data)
return true;
else {
if (Array[Now].getaccNum() < data)
LowBoun = Now + 1;
else
HighBoun = Now - 1;
}
if (LowBoun > HighBoun)
return false;
}
}
public void insert(Customer newData) {
int i, j;
if (!find(newData.getaccNum())) {
for (i = 0; i < nElem; i++)
if (Array[i].getaccNum() > newData.getaccNum())
break;
for (j = nElem; j > i; j--)
Array[j] = Array[j - 1];
Array[j] = newData;
nElem++;
} else
System.out.println("the number is exist!");
}
public boolean delete(int acc) {
int i;
for (i = 0; i < nElem; i++)
if (Array[i].getaccNum() == acc)
break;
if (i == nElem)
return false;
else {
for (int j = i; j < nElem; j++) {
Array[j] = Array[j + 1];
}
nElem--;
return true;
}
}
public void transferMoney(int fromAcc, int toAcc, double amount) {
int i, j;
for (i = 0; i < nElem; i++) {
if (Array[i].getaccNum() == fromAcc)
break;
}
for (j = 0; j < nElem; j++) {
if (Array[j].getaccNum() == toAcc)
break;
}
Array[i].withdraw(amount);
Array[j].deposit(amount);
}
public void personalDisplay(int acc) {
int i;
for (i = 0; i < nElem; i++) {
if (Array[i].getaccNum() == acc)
break;
}
Array[i].personalDisplay();
}
public void depositMoney(int acc, double amount) {
int i;
for (i = 0; i < nElem; i++) {
if (Array[i].getaccNum() == acc)
break;
}
Array[i].deposit(amount);
}
public void withdrawMoney(int acc, double amount) {
int i;
for (i = 0; i < nElem; i++) {
if (Array[i].getaccNum() == acc)
break;
}
Array[i].withdraw(amount);
}
public void displayList() {
for (int i = 0; i < nElem; i++) {
this.Array[i].display();
}
}
}
答案 0 :(得分：0)
我认为您需要在Customer类和
中实现类似的接口然后这样做
if(!c.contains(customer)){
c[numberOfCustomers]=customer;
numberOfCustomers++;
}
如果使用Arrays.asList（）方法在数组上没有包含，则可以将c从数组转换为列表。
这可能对您有所帮助。
答案 1 :(得分：0)
我以不同的方式解决了我的代码：
import java.util.*;
public class BankSystem {
private Account accArr;
Scanner Input;
public BankSystem() {
accArr = new Account(100);
Input = new Scanner(System.in);
}
public static void main(String[] args) {
BankSystem bs = new BankSystem();
bs.main();
}
public void main() {
int Choice = 1;
while (Choice != 0) {
System.out.println("==========================");
System.out.println("Please Enter Your Choice: ");
System.out.println("1=> Main");
System.out.println("2=> New Account");
System.out.println("3=> Deposit Money");
System.out.println("4=> Withdraw Money");
System.out.println("5=> Personal Balance");
System.out.println("6=> Money Transfer");
System.out.println("7=> Full Customers Report:");
System.out.println("8=> Delete Account");
System.out.println("0=> Exit");
System.out.println("==========================");
System.out.print("=> ");
try {
Choice = Input.nextInt();
} catch (InputMismatchException e) {
System.err.print("! You Have Entered Wrong Value !\n");
Input.next();
}
switch (Choice) {
case 1:
System.out.println("========Main Menu=========");
main();
break;
case 2:
System.out.println("========New Account=========");
System.out.print("Enter The Account Number:");
int acc = Input.nextInt();
System.out.print("Enter The Account First Name:");
String name = Input.next();
System.out.print("Enter The Account Last Name:");
String Sname = Input.next();
System.out.print("Enter The Amount:");
double bal = Input.nextDouble();
Customer cust = new Customer(acc, name, Sname, bal);
this.accArr.insert(cust);
break;
case 3:
System.out.println("========Deposit Money=========");
System.out.print("Enter Account Number:");
acc = Input.nextInt();
System.out.print("Enter The Amount:");
double amount = Input.nextDouble();
if (amount <= 0)
System.out
.println("The amount can not be negative or zero.");
else
this.accArr.depositMoney(acc, amount);
break;
case 4:
System.out.println("========Withdraw Money=========");
System.out.print("Enter Account Number:");
acc = Input.nextInt();
System.out.print("Enter The Amount:");
amount = Input.nextDouble();
if (amount <= 0)
System.out
.println("The amount can not be negative or zero.");
else
this.accArr.withdrawMoney(acc, amount);
break;
case 5:
System.out.println("========Personal Balance=========");
System.out.print("Enter The Account Number:");
acc = Input.nextInt();
this.accArr.personalDisplay(acc);
break;
case 6:
System.out.println("========Money Transfer=========");
System.out.print("Enter The Sender Account Number:");
int fromAcc = Input.nextInt();
System.out.print("Enter The Receiver Account Number:");
int toAcc = Input.nextInt();
System.out.print("Enter The Amount:");
amount = Input.nextDouble();
this.accArr.transferMoney(fromAcc, toAcc, amount);
break;
case 7:
System.out.println("========Full Customers Report=========");
System.out.println("Ac Num.\tName\tSurname\tBalance");
this.accArr.displayList();
break;
case 8:
System.out.println("========Delete Account=========");
System.out.print("Enter The Account Number:");
acc = Input.nextInt();
this.accArr.delete(acc);
break;
case 9:
break;
case 0:
System.out
.println("Thanks For Using this App we're Looking forward to see You Again :)");
System.exit(0);
break;
default:
System.out.println("Entry is not valid.\n");
break;
}
}
}
}
class Customer {
private int accNum;
private String name;
private String Sname;
private double balance;
public Customer(int a, String n, String Sn, double amount) {
accNum = a;
name = n;
Sname = Sn;
balance = amount;
}
public String getname() {
return name;
}
public String getSname() {
return Sname;
}
public int getaccNum() {
return accNum;
}
public double getBalance() {
return balance;
}
public void personalDisplay() {
System.out.println(getname() + " " + getSname() + "'s Balance is "
+ getBalance() + "$");
}
public void deposit(double amount) {
this.balance += amount;
System.out.println(amount + "$ has been Deposited");
}
public void withdraw(double amount) {
if (this.balance >= amount) {
this.balance -= amount;
System.out.println(amount + "$ has been Withdrawed");
} else
System.out.println("Insufficient Balance " + balance);
}
public void display() {
System.out.println(getaccNum() + "\t" + getname() + "\t" + getSname()
+ "\t" + getBalance() + "$");
}
}
class Account {
private Customer[] Array;
private int nElem;
public Account(int max) {
Array = new Customer[max];
nElem = 0;
}
public void insert(Customer newData) {
int i, j;
if (newData.getaccNum() <= 0)
System.out.println("The Account ID can't be Negative");
else
if (find(newData.getaccNum()))
System.out.println("This User is already exist!");
else {
if (newData.getBalance() < 0)
System.out.println("Amount can't be Negative!");
else {
if (nElem == (Array.length - 1))
System.out.println("Slots are Full");
else {
for (i = 0; i < nElem; i++)
if (Array[i].getaccNum() > newData.getaccNum())
break;
for (j = nElem; j > i; j--)
Array[j] = Array[j - 1];
Array[i] = newData;
nElem++;
}
}
}
}
public boolean delete(int del) {
int i;
for (i = 0; i < nElem; i++)
if (Array[i].getaccNum() == del)
break;
if (i == nElem)
return false;
else {
for (int j = i; j < nElem; j++) {
Array[j] = Array[j + 1];
}
nElem--;
System.out.println("Customer " + del + " has been Deleted !");
return true;
}
}
public boolean find(int accountId) {
if (nElem == 0) {
return false;
}
int LowBoun = 0;
int HighBoun = nElem - 1;
int now;
while (true) {
now = (LowBoun + HighBoun) / 2;
if (this.Array[now].getaccNum() == accountId)
return true;
else {
if (Array[now].getaccNum() < accountId)
LowBoun = now + 1;
else
HighBoun = now - 1;
}
if (LowBoun > HighBoun)
return false;
}
}
public void transferMoney(int fromAcc, int toAcc, double amount) {
int i, j;
for (i = 0; i < nElem; i++) {
if (Array[i].getaccNum() == fromAcc)
break;
}
for (j = 0; j < nElem; j++) {
if (Array[j].getaccNum() == toAcc)
break;
}
Array[i].withdraw(amount);
Array[j].deposit(amount);
System.out.println(amount + "$ has been Transfered to Account Number:'"
+ toAcc + "'");
}
public void personalDisplay(int acc) {
int i;
for (i = 0; i < nElem; i++) {
if (Array[i].getaccNum() == acc)
break;
}
Array[i].personalDisplay();
}
public void depositMoney(int acc, double amount) {
int i;
for (i = 0; i < nElem; i++) {
if (Array[i].getaccNum() == acc)
break;
}
Array[i].deposit(amount);
}
public void withdrawMoney(int acc, double amount) {
int i;
for (i = 0; i < nElem; i++) {
if (Array[i].getaccNum() == acc)
break;
}
Array[i].withdraw(amount);
}
public void displayList() {
for (int i = 0; i < nElem; i++) {
this.Array[i].display();
}
}
}