I have a homework in java. I am tasked to build a bank that can withdraw, deposit and inquire balance. My problem is that I couldn't get to update my balance after deposits and withdrawals... I've tried everything I could do but still cant get the logic. Can someone help add to my program... thanks
import java.util.Scanner;
public class bankJava
{
Scanner input = new Scanner(System.in);
double balance;
double amount;
public void withdraw()
{
System.out.println("Enter amount: ");
amount = input.nextInt();
balance = balance - amount;
}
public void deposit()
{
System.out.println("Enter amount: ");
amount = input.nextInt();
balance = balance + amount;
}
public void accBalance()
{
}
}
---------------------------------MAIN--------------------------------
import java.util.Scanner;
public class bankJavaTest {
public static void main(String[] args){
Scanner input = new Scanner(System.in);
int action;
bankJava wdraw = new bankJava();
bankJava dposit = new bankJava();
bankJava balanceInquiry = new bankJava();
bankJava amount = new bankJava();
do{
System.out.println("Choose Action: ");
System.out.println("(1) Withdraw");
System.out.println("(2) Deposit");
System.out.println("(3) Balance Inquiry");
System.out.println("(4) Exit");
action = input.nextInt();
switch(action){
//---------WITHDRAW------------//
case 1 :
System.out.println("******Withdraw******");
wdraw.withdraw();
System.out.println("***************************");
break;
//---------DEPOSIT------------//
case 2 :
System.out.println("******Deposit******");
dposit.deposit();
System.out.println("***************************");
break;
//-----------Balance Inquiry-------//
case 3 :
System.out.println("******Balance Inquiry******");
balanceInquiry.accBalance();
System.out.println("***************************");
break;
case 4 :
System.out.println("Thank you for choosing our bank!");
break;
default :
System.out.println("Invalid action.");
break;
}
}while(action != 4);
}
}
Why you are instatiating 4 different JavaBank? Doing this for each operation you will execute each method in a different object. If I understand well your question I think you could resolve your problem easily working in the same object.
import java.util.Scanner;
public class bankJavaTest {
public static void main(String[] args){
Scanner input = new Scanner(System.in);
int action;
bankJava myJavaBank = new bankJava(); //creating the bank
do{
System.out.println("Choose Action: ");
System.out.println("(1) Withdraw");
System.out.println("(2) Deposit");
System.out.println("(3) Balance Inquiry");
System.out.println("(4) Exit");
action = input.nextInt();
switch(action){
//---------WITHDRAW------------//
case 1 :
System.out.println("******Withdraw******");
myJavaBank.withdraw(); //withdrawing from it
System.out.println("***************************");
break;
//---------DEPOSIT------------//
case 2 :
System.out.println("******Deposit******");
myJavaBank.deposit(); //deposit from it
System.out.println("***************************");
break;
//-----------Balance Inquiry-------//
case 3 :
System.out.println("******Balance Inquiry******");
myJavaBank.accBalance();
//You don't post this method but I suppose it will refer to the same bank
System.out.println("***************************");
break;
case 4 :
System.out.println("Thank you for choosing our bank!");
break;
default :
System.out.println("Invalid action.");
break;
}
}while(action != 4);
}
}
Now should work. With your code you had 4 different bank, one only for deposit, one only for withdraw and so on. So one bank will continue to increase money, and one continue to decrease in negative.
Morover the amount parameter should not be a JavaBank parameter, bur a local variable inside each method so that it does not define a Bank.
Something like
public class bankJava
{
Scanner input = new Scanner(System.in);
double balance;
public void withdraw()
{
System.out.println("Enter amount: ");
double amount = input.nextInt();
balance = balance - amount;
}
public void deposit()
{
System.out.println("Enter amount: ");
double amount = input.nextInt();
balance = balance + amount;
}
I also suggest to change the input.nextInt() with input.nextDouble() so that you create the amount as a double.
If you don't see the Balance Inquiry is because obviously you have the accBalance() method blank. Edit it like this:
public void accBalance(){
System.out.println("Your balance is: "+this.balance);
}