Question

Suppose the bank wanted to keep track of the total number of deposits and withdrawals (separately) for each day, and the total amount deposited and withdrawn. Write code to do this as follows:

1. Add a public toString method to the class so that Account objects can be easily printed. Test that this works by adding a main method to Account that creates and prints two Account objectsvia println statements. Provide the transcript in the lab document.
2. Add four private static variables to the Account class, one to keep track of each value above (number and total amount of deposits, number and total of withdrawals). Because these values should be shared by all Account objects, they should be represented as static (i.e., "class") variables. This is in contrast to the instance variables that hold the balance, name, and account number of each account. Each Account object has its own set of these. Recall that numeric static and instance variables are initialized to 0 by default.
3. Add public accessor methods (sometimes called, "getters") to return the values of each of the class variables you just added, e.g., public static int getNumDeposits(). Note that these methods are static because the values they are accessing are also static.
4. Modify the withdraw and deposit methods to update the appropriate static variables at each withdrawal and deposit.
5. File ProcessTransactions.java contains a program that creates and initializes two Account objects and enters a loop that allows the user to enter transactions for either account until asking to quit. Modify this program as follows:
   • After the loop, print the total number of deposits and withdrawals and the total amount of each. You will need to use the static Account methods that you wrote above, in step 3. Test your program. Make sure the output is correct. Place a transcript in your lab document that demonstrates that deposits and withdrawals are being recorded properly.
6. Create a new static method, handleOneDay, that takes two arguments, the accounts. The body of this method should be all the code in the current main method between the comments //Finish handling the account transaction and //Handle the account transactions. Cut and paste this code into the new method. You may also need to move some of the variable declarations in main to be in handleOneDayinstead. Now, replace the code that was in main with a single call to handleOneDay. Do that, then run your program to make sure everything still works as it did before you began this surgery.
7. Now, change main so that the user can enter data for many days, instead of just one. Embed the call to handleOneDay in a loop there that allows the transactions to be recorded and counted for many days. The user should be prompted, "do you want to enter transactions for another day?" at the bottom of this loop. At the beginning of each day print the summary for each account, then have the user enter the transactions for the day. When all of the transactions have been entered, print the total numbers and amounts (as above), then reset these values to 0 and repeat for the next day. Note that you will need to add methods to reset the variables holding the numbers and amounts of withdrawals and deposits to the Account class. Think: should these be static or non-static methods?

Answer 1

import java.util.*;
public class Accounts {

  
//private static variables
private static int number_of_deposits=0;
private static int number_of_withdrawals=0;
private static int total_amount_of_deposits=0;
private static int total_amount_of_withdrawals=0;
  
//other instance variables
public double balance=0;
public String name;
public String account_number;
  
//public accessor methods
public static int getNumberOfDeposits(){
return number_of_deposits;
}
public static int getNumberOfWithdrawals(){
return number_of_withdrawals;
}
public static int getTotalAmountOfWithdrawals(){
return total_amount_of_withdrawals;
}
public static int getTotalAmountOfDeposits(){
return total_amount_of_deposits;
}
public double getBalance(){
return this.balance;
}
  
public String getName(){
return this.name;
}
public String getAccountNumber(){
return this.account_number;
}
  
//toString method
public String toString(){
return ("\nName : "+this.getName()+" Account Number : "+this.getAccountNumber()+" Balane : "+this.getBalance());
  
}
  
//withdraw and deposit methods
public void withdraw(double amount){
if(this.balance>=amount){
number_of_withdrawals++;
total_amount_of_withdrawals+=amount;
this.balance-=amount;
}
else{
System.out.println("\nInsufficient balance\n");
}
}
  
public void deposit(double amount){
number_of_deposits++;
total_amount_of_deposits+=amount;
this.balance+=amount;
}
//main method
public static void main(String args[]){
int ch=1;
Accounts a1=new Accounts();
Accounts a2=new Accounts();
//Reading basic details
Scanner data=new Scanner(System.in);
System.out.println("\nEnter details of Account 1 :\n");
System.out.println("\nName : ");
a1.name=data.next();
System.out.println("\nAccount Number : ");
a1.account_number=data.next();
  
System.out.println("\nEnter details of Account 2 :\n");
System.out.println("\nName : ");
a2.name=data.next();
System.out.println("\nAccount Number : ");
a2.account_number=data.next();
  
//loop
do{
int ch1;
System.out.println("\n------------Choose Account-------------\n1. Acccount 1\n2 Account 2\n");
ch1=Integer.parseInt(data.next());
switch(ch1){
case 1:
System.out.println("\n1.Deposit\n2.Withdraw\n");
switch(Integer.parseInt(data.next())){
case 1:
System.out.println("\nEnter amount to deposit : ");
a1.deposit(Integer.parseInt(data.next()));
break;
case 2:
System.out.println("\nEnter amount to withdraw : ");
a1.withdraw(Integer.parseInt(data.next()));
break;
  
}
break;

case 2:
System.out.println("\n1.Deposit\n2.Withdraw\n");
switch(Integer.parseInt(data.next())){
case 1:
System.out.println("\nEnter amount to deposit : ");
a2.deposit(Integer.parseInt(data.next()));
break;
case 2:
System.out.println("\nEnter amount to withdraw : ");
a2.withdraw(Integer.parseInt(data.next()));
break;
  
}
break;

}
System.out.println("\nDo you want to continue ,1 to continue ,any other number to stop : ");
ch=Integer.parseInt(data.next());
}while(ch==1);
  
//display the details of deposit and withdrwals
  
System.out.println("\nNumber of Deposits : "+getNumberOfDeposits());
System.out.println("\nNumber of Withdrawals : "+getNumberOfWithdrawals());
System.out.println("\nTotal Amount of Deposits : "+getTotalAmountOfDeposits());
System.out.println("\nTotal Amount of Withdrawals : "+getTotalAmountOfWithdrawals());
}

}

-------------------------------------------handle one day method------------------------------

public static void handleOneDay(Accounts a1,Accounts a2){
Scanner data=new Scanner(System.in);

int ch1;
System.out.println("\n------------Choose Account-------------\n1. Acccount 1\n2 Account 2\n");
ch1=Integer.parseInt(data.next());
switch(ch1){
case 1:
System.out.println("\n1.Deposit\n2.Withdraw\n");
switch(Integer.parseInt(data.next())){
case 1:
System.out.println("\nEnter amount to deposit : ");
a1.deposit(Integer.parseInt(data.next()));
break;
case 2:
System.out.println("\nEnter amount to withdraw : ");
a1.withdraw(Integer.parseInt(data.next()));
break;
  
}
break;

case 2:
System.out.println("\n1.Deposit\n2.Withdraw\n");
switch(Integer.parseInt(data.next())){
case 1:
System.out.println("\nEnter amount to deposit : ");
a2.deposit(Integer.parseInt(data.next()));
break;
case 2:
System.out.println("\nEnter amount to withdraw : ");
a2.withdraw(Integer.parseInt(data.next()));
break;
  
}
break;

}
  
  
}