如何解决如何将参数值从一种方法传递到同一类中的另一种方法
我正在为具有存款,提款和余额查询功能的ATM模拟器编写此代码。该代码需要使用方法而不是switch语句编写。 我的存款方法可行,但是我的提款和 balanceInquiry 方法都存在问题。我希望所有方法都可以访问 checkAc_bal ,以便执行计算。我是Java的新手,我正在尝试将方法行为归于我。非常感谢。
...
import java.util.Scanner;
public class Main
{
public static void showMenu()
{
Scanner sc = new Scanner(System.in) ;
String input = null ;
do
{
input = showOptions(sc) ;
if(input != null)
{
switch(input.trim())
{
case "1" : deposit(sc) ;
break ;
case "2" : withdraw(sc);
break ;
case "3" : balanceInquiry() ;
break ;enter code here
case "4" : System.exit(0);
default : System.out.println("Wrong option entered. Exiting application") ;
System.exit(0);
}
}
}while(true) ;
}
public static String showOptions(Scanner sc)
{
System.out.println("********************Welcome to ATM Machine******************** ");
System.out.println("Enter Option");
System.out.println("1. Deposit");
System.out.println("2. Withdrawal");
System.out.println("3. Balance Inquiry");
System.out.println("4. Exit\n");
String input = sc.nextLine() ;
return input ;
}
public static void deposit (Scanner sc) {
int checkAc_bal = 0;
System.out.print("Enter amount to be deposited:");
int deposit;
Scanner s = new Scanner(System.in);
deposit = s.nextInt();
//int checkAc_bal = 0;
checkAc_bal = checkAc_bal + deposit;
System.out.println("Your Money has been successfully deposited");
System.out.println("Balance: " +checkAc_bal);
}
public static void withdraw (Scanner sc){
System.out.print("Enter money to be withdrawn:");
int withdraw;
Scanner s = new Scanner(System.in);
withdraw = s.nextInt();
if(withdraw<=checkAc_bal)
{
checkAc_bal = checkAc_bal - withdraw;
System.out.println("Please collect your money");
}
else
{
System.out.println("Insufficient Balance");
}
System.out.println("");
}
public static void balanceInquiry () {
System.out.println("Balance: " + checkAc_bal);
}
public static void main(String[] args) {
showMenu();
}
}
解决方法
如果希望int可被其他方法访问,则需要在整个类的范围内而不是在方法内部声明它。尝试在Main类中声明checkAc_bal。
,将其定义为类成员:
import java.util.Scanner;
public class Main
{
static int checkAc_bal = 0; //<------------------------add this
public static void showMenu()
{
Scanner sc = new Scanner(System.in) ;
String input = null ;
do
{
input = showOptions(sc) ;
if(input != null)
{
switch(input.trim())
{
case "1" : deposit(sc) ;
break ;
case "2" : withdraw(sc);
break ;
case "3" : balanceInquiry() ;
break ;enter code here
case "4" : System.exit(0);
default : System.out.println("Wrong option entered. Exiting application") ;
System.exit(0);
}
}
}while(true) ;
}
public static String showOptions(Scanner sc)
{
System.out.println("********************Welcome to ATM Machine******************** ");
System.out.println("Enter Option");
System.out.println("1. Deposit");
System.out.println("2. Withdrawal");
System.out.println("3. Balance Inquiry");
System.out.println("4. Exit\n");
String input = sc.nextLine() ;
return input ;
}
public static void deposit (Scanner sc) {
// int checkAc_bal = 0; <---------------- remove this
System.out.print("Enter amount to be deposited:");
int deposit;
Scanner s = new Scanner(System.in);
deposit = s.nextInt();
//int checkAc_bal = 0;
checkAc_bal = checkAc_bal + deposit;
System.out.println("Your Money has been successfully deposited");
System.out.println("Balance: " +checkAc_bal);
}
public static void withdraw (Scanner sc){
System.out.print("Enter money to be withdrawn:");
int withdraw;
Scanner s = new Scanner(System.in);
withdraw = s.nextInt();
if(withdraw<=checkAc_bal)
{
checkAc_bal = checkAc_bal - withdraw;
System.out.println("Please collect your money");
}
else
{
System.out.println("Insufficient Balance");
}
System.out.println("");
}
public static void balanceInquiry () {
System.out.println("Balance: " + checkAc_bal);
}
public static void main(String[] args) {
showMenu();
}
}
,
您有三个查询,以下是答案:
- 将变量全局声明为可从所有方法访问。
- 不使用切换大小写(在这种情况下,您需要使用if-else)
- 如何将参数传递给相同类中的方法? 我看到您已经在代码中做到了这一点。您通过参数调用了其他方法,并且也收到了它们。
或者根据您的实际需求很好地提出问题。
这是完整的代码:
import java.util.Scanner;
public class Main{
static int checkAc_bal = 0; // <---- declare on class scope
public static void showMenu() {
Scanner sc = new Scanner(System.in) ;
String input = null ;
do {
input = showOptions(sc) ;
if(input != null) {
// removed the switch-case and if-else used
if(input.trim().equals("1")) {deposit();}
else if(input.trim().equals("2")) {withdraw();}
else if(input.trim().equals("3")) {balanceInquiry();}
else if(input.trim().equals("4")) {System.exit(0);}
else {
System.out.println("Wrong option entered. Exiting application") ;
System.exit(0);
}
}
}while(true) ;
}
public static String showOptions(Scanner sc){
System.out.println("********************Welcome to ATM Machine******************** ");
System.out.println("Enter Option");
System.out.println("1. Deposit");
System.out.println("2. Withdrawal");
System.out.println("3. Balance Inquiry");
System.out.println("4. Exit\n");
String input = sc.nextLine() ;
return input ;
}
public static void deposit () {
System.out.print("Enter amount to be deposited:");
int deposit;
Scanner s = new Scanner(System.in);
deposit = s.nextInt();
checkAc_bal = checkAc_bal + deposit;
System.out.println("Your Money has been successfully deposited");
System.out.println("Balance: " +checkAc_bal);
}
public static void withdraw (){
System.out.print("Enter money to be withdrawn:");
int withdraw;
Scanner s = new Scanner(System.in);
withdraw = s.nextInt();
if(withdraw<=checkAc_bal) {
checkAc_bal = checkAc_bal - withdraw;
System.out.println("Please collect your money");
} else {
System.out.println("Insufficient Balance");
}
System.out.println("");
}
public static void balanceInquiry () {
System.out.println("Balance: " + checkAc_bal);
}
public static void main(String[] args) {
showMenu();
}
}
输出:
********************Welcome to ATM Machine********************
Enter Option
1. Deposit
2. Withdrawal
3. Balance Inquiry
4. Exit
1
Input : 1
Enter amount to be deposited:100
Your Money has been successfully deposited
Balance: 100
********************Welcome to ATM Machine********************
Enter Option
1. Deposit
2. Withdrawal
3. Balance Inquiry
4. Exit
1
Input : 1
Enter amount to be deposited:200
Your Money has been successfully deposited
Balance: 300
********************Welcome to ATM Machine********************
Enter Option
1. Deposit
2. Withdrawal
3. Balance Inquiry
4. Exit
1
Input : 1
Enter amount to be deposited:200
Your Money has been successfully deposited
Balance: 500
********************Welcome to ATM Machine********************
Enter Option
1. Deposit
2. Withdrawal
3. Balance Inquiry
4. Exit
3
Input : 3
Balance: 500
********************Welcome to ATM Machine********************
Enter Option
1. Deposit
2. Withdrawal
3. Balance Inquiry
4. Exit
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