Java 异常处理不起作用
我做了一个自动取款机程序。我有一个try-catch,它会要求用户输入他们的pin码。pin码必须为5位数字。因此,异常将检查是否为5位数字,但异常处理不起作用。不管我输入什么号码,它总是说无效号码 这是我的代码try-catch在程序的顶部,异常处理checkNumber在程序的底部Java 异常处理不起作用,java,exception,exception-handling,Java,Exception,Exception Handling,我做了一个自动取款机程序。我有一个try-catch,它会要求用户输入他们的pin码。pin码必须为5位数字。因此,异常将检查是否为5位数字,但异常处理不起作用。不管我输入什么号码,它总是说无效号码 这是我的代码try-catch在程序的顶部,异常处理checkNumber在程序的底部 import java.util.ArrayList; import java.util.Scanner; public class BankMain { private double availabl
import java.util.ArrayList;
import java.util.Scanner;
public class BankMain
{
private double availableBal = 80;
private double totalBal = 100;
private double availableBal2 = 480;
private double totalBal2 = 500;
private double availableBal3 = 80;
private double totalBal3 = 100;
ArrayList<Integer> cardNum = new ArrayList<Integer>();
static Scanner input = new Scanner(System.in);
private String error; // String the error from the exception
{
error = "error";
}
public void cardNumbers()
{
Scanner cards = new Scanner(System.in);
Scanner input = new Scanner(System.in);
Scanner keyboard = new Scanner(System.in);
try
{
System.out.println("Please select a 5 digit card number");
cardNum.add(input.nextInt());
checkNumber();
}
catch (invalidNumber err)
{
System.out.println("Caught Error: " + err.getError());
}
System.out.println("Thank you! You're card number is " + cardNum);
System.out.println("Type 'c' to go back to main menu.");
String value = keyboard.next();
if (value.equalsIgnoreCase("c"))
{
menu();
}
else if (!keyboard.equals('c'))
{
System.out.println("Invalid Entry!");
}
}
public void menu()
{
System.out.println("ATM Menu:");
System.out.println();
System.out.println("1 = Create Account");
System.out.println("2 = Account Login");
System.out.println("3 = Exit ATM");
query();
}
public void startAtm()
{
menu();
}
public void drawMainMenu()
{
AccountMain main3 = new AccountMain();
int selection;
System.out.println("\nATM main menu:");
System.out.println("1 - View account balance");
System.out.println("2 - Withdraw funds");
System.out.println("3 - Add funds");
System.out.println("4 - Back to Account Menu");
System.out.println("5 - Terminate transaction");
System.out.print("Choice: ");
selection = input.nextInt();
switch (selection)
{
case 1:
viewAccountInfo();
break;
case 2:
withdraw();
break;
case 3:
addFunds();
break;
case 4:
AccountMain.selectAccount();
break;
case 5:
System.out.println("Thank you for using this ATM!!! goodbye");
}
}
public void viewAccountInfo()
{
System.out.println("Account Information:");
System.out.println("\t--Total balance: $" + totalBal);
System.out.println("\t--Available balance: $" + availableBal);
drawMainMenu();
}
public void viewAccountInfo2()
{
System.out.println("Account Information:");
System.out.println("\t--Total balance: $" + totalBal2);
System.out.println("\t--Available balance: $" + availableBal2);
drawMainMenu();
}
public void deposit(int depAmount)
{
System.out.println("\n***Please insert your money now...***");
totalBal = totalBal + depAmount;
availableBal = availableBal + depAmount;
}
public void checkNsf(int withdrawAmount)
{
if (totalBal - withdrawAmount < 0)
System.out.println("\n***ERROR!!! Insufficient funds in you accout***");
else
{
totalBal = totalBal - withdrawAmount;
availableBal = availableBal - withdrawAmount;
System.out.println("\n***Please take your money now...***");
}
}
public void addFunds()
{
int addSelection;
System.out.println("Deposit funds:");
System.out.println("1 - $20");
System.out.println("2 - $40");
System.out.println("3 - $60");
System.out.println("4 - $100");
System.out.println("5 - Back to main menu");
System.out.print("Choice: ");
addSelection = input.nextInt();
switch (addSelection)
{
case 1:
deposit(20);
drawMainMenu();
break;
case 2:
deposit(40);
drawMainMenu();
break;
case 3:
deposit(60);
drawMainMenu();
break;
case 4:
deposit(100);
drawMainMenu();
break;
case 5:
drawMainMenu();
break;
}
}
public void withdraw()
{
int withdrawSelection;
System.out.println("Withdraw money:");
System.out.println("1 - $20");
System.out.println("2 - $40");
System.out.println("3 - $60");
System.out.println("4 - $100");
System.out.println("5 - Back to main menu");
System.out.print("Choice: ");
withdrawSelection = input.nextInt();
switch (withdrawSelection)
{
case 1:
checkNsf(20);
drawMainMenu();
break;
case 2:
checkNsf(40);
drawMainMenu();
break;
case 3:
checkNsf(60);
drawMainMenu();
break;
case 4:
checkNsf(100);
drawMainMenu();
break;
case 5:
drawMainMenu();
break;
}
}
public void query()
{
Scanner keyboard = new Scanner(System.in);
double input = keyboard.nextInt();
if (input == 2)
{
BankMainPart2 main2 = new BankMainPart2();
System.out.println("Please enter your 5 digit card number.");
BankMainPart2.loginCard(cardNum);
}
else if (input == 1)
{
cardNumbers();
}
else if (input == 3)
{
System.out.println("Thank you, have a nice day!");
System.exit(0);
}
}
public void checkingMenu()
{
AccountMain main3 = new AccountMain();
int selection;
System.out.println("\nATM main menu:");
System.out.println("1 - View account balance");
System.out.println("2 - Withdraw funds");
System.out.println("3 - Add funds");
System.out.println("4 - Back to Account Menu");
System.out.println("5 - Terminate transaction");
System.out.print("Choice: ");
selection = input.nextInt();
switch (selection)
{
case 1:
viewAccountInfo2();
break;
case 2:
withdraw();
break;
case 3:
addFunds();
break;
case 4:
AccountMain.selectAccount();
break;
case 5:
System.out.println("Thank you for using this ATM!!! goodbye");
}
}
private static void checkNumber() throws invalidNumber // run the check activation exception
{
if (String.valueOf(input).length() != 5)
{
throw new invalidNumber("invalid number");
}
else
{
System.out.println("Works!");
}
}
public static void main(String args[])
{
BankMain myAtm = new BankMain();
myAtm.startAtm();
}
}
import java.util.ArrayList;
导入java.util.Scanner;
公共班克曼
{
专用双可用数据库=80;
私人双倍总余额=100;
专用双可用B L2=480;
私人双总BAL2=500;
专用双可用EBAL3=80;
私人双总BAL3=100;
ArrayList cardNum=新的ArrayList();
静态扫描仪输入=新扫描仪(System.in);
私有字符串错误;//从异常中提取错误字符串
{
error=“error”;
}
公共卡号码()
{
扫描仪卡=新扫描仪(System.in);
扫描仪输入=新扫描仪(System.in);
扫描仪键盘=新扫描仪(System.in);
尝试
{
System.out.println(“请选择一个5位数的卡号”);
add(input.nextInt());
checkNumber();
}
捕获(无效号码错误)
{
System.out.println(“捕获的错误:+err.getError());
}
System.out.println(“谢谢!您的卡号是”+cardNum);
System.out.println(“键入'c'返回主菜单”);
字符串值=键盘.next();
if(值相等信号情况(“c”))
{
菜单();
}
如果(!keyboard.equals('c'),则为else
{
System.out.println(“无效条目!”);
}
}
公共无效菜单()
{
System.out.println(“ATM菜单:”);
System.out.println();
System.out.println(“1=创建帐户”);
System.out.println(“2=帐户登录”);
System.out.println(“3=退出ATM”);
查询();
}
公共无效STARTAM()
{
菜单();
}
公共菜单()
{
AccountMain main 3=新AccountMain();
int选择;
System.out.println(“\nATM主菜单:”);
System.out.println(“1-查看账户余额”);
System.out.println(“2-提取资金”);
System.out.println(“3-添加资金”);
System.out.println(“4-返回帐户菜单”);
System.out.println(“5-终止交易”);
系统输出打印(“选择:”);
selection=input.nextInt();
开关(选择)
{
案例1:
viewAccountInfo();
打破
案例2:
撤回();
打破
案例3:
增加资金();
打破
案例4:
AccountMain.selectAccount();
打破
案例5:
System.out.println(“感谢您使用这个ATM!!!再见”);
}
}
public void viewcountinfo()
{
System.out.println(“账户信息:”);
System.out.println(“\t--总余额:$”+总余额);
System.out.println(“\t--可用余额:$”+可用余额);
DrawMain菜单();
}
public void viewAccountInfo2()
{
System.out.println(“账户信息:”);
System.out.println(“\t——总余额:$”+totalBal2);
System.out.println(“\t——可用余额:$”+availableBal2);
DrawMain菜单();
}
公共作废保证金(金额)
{
System.out.println(“\n***请立即插入您的钱…***”);
总余额=总余额+折旧金额;
可用余额=可用余额+折旧金额;
}
公共作废支票NSF(取款金额)
{
if(总余额-提取金额<0)
System.out.println(“\n***错误!!!您账户中的资金不足***”;
其他的
{
totalBal=totalBal-提款金额;
availableBal=availableBal—提款金额;
System.out.println(“\n***请立即取款…***”);
}
}
公共基金()
{
智力选择;
System.out.println(“存款资金:”);
系统输出打印项次(“1-20美元”);
系统输出打印项次(“2-40美元”);
系统输出打印项次(“3-60美元”);
系统输出打印项次(“4-100美元”);
System.out.println(“5-返回主菜单”);
系统输出打印(“选择:”);
addSelection=input.nextInt();
开关(添加选择)
{
案例1:
按金(20);
DrawMain菜单();
打破
案例2:
按金(40);
DrawMain菜单();
打破
案例3:
存款(60);
DrawMain菜单();
打破
案例4:
存款(100);
DrawMain菜单();
打破
案例5:
DrawMain菜单();
打破
}
}
公开撤回
{
智力选择;
System.out.println(“取款:”);
系统输出打印项次(“1-20美元”);
系统输出打印项次(“2-40美元”);
系统输出打印项次(“3-60美元”);
系统输出打印项次(“4-100美元”);
System.out.println(“5-返回主菜单”);
系统输出打印(“选择:”);
撤销选择=输入.nextInt();
开关(选择)
{
案例1:
国家科学基金会(20);
DrawMain菜单();
打破
案例2:
国家科学基金会(40);
DrawMain菜单();
打破
案例3:
nsf(60);
DrawMain菜单();
打破
案例4:
检查NSF(100);
DrawMain菜单();
打破
案例5:
DrawMain菜单();
打破
}
}
公共无效查询()
{
扫描仪键盘=新扫描仪(System.in);
if (String.valueOf(input).length() != 5)
{
throw new invalidNumber("invalid number");
}
else
{
System.out.println("Works!");
}
double input = keyboard.nextInt()
static Scanner input = new Scanner(System.in)
try {
System.out.println("Please select a 5 digit card number");
cardNum.add(input.nextInt());
checkNumber();
} catch (invalidNumber err) {
System.out.println("Caught Error: " + err.getError());
}
private static void checkNumber() throws invalidNumber
{
if (String.valueOf(input).length() != 5) {
throw new invalidNumber("invalid number");
}
else {
System.out.println("Works!");
}
}
Scanner cards = new Scanner(System.in);
Scanner input = new Scanner(System.in);
Scanner keyboard = new Scanner(System.in);
private static void checkNumber(int number) throws invalidNumber
{
if (String.valueOf(number).length() != 5) {
throw new invalidNumber("invalid number");
}
else {
System.out.println("Works!");
}
}
try {
System.out.println("Please select a 5 digit card number");
int number = input.nextInt();
cardNum.add(number);
checkNumber(number);
} catch (invalidNumber err) {
System.out.println("Caught Error: " + err.getError());
}