Practice questions on Java Classes and Objects – Create a Class Bank

Create a class Bank with the following Menu :

1. Display all account details
2. Search by account number
3. Deposit the amount
4. Withdraw the amount
5. Exit

Solution

import java.util.Scanner;  

class BankOperations {  
    String accno;  
    String name;  
    String type;  
    long balance;  
    Scanner sc = new Scanner(System.in);  
    
    //method to open new account  
    public void openAccount() {  
        System.out.print("Enter Account No: ");  
        accno = sc.next();  
        System.out.print("Enter Account type: ");  
        type = sc.next();  
        System.out.print("Enter Name: ");  
        name = sc.next();  
        System.out.print("Enter Balance: ");  
        balance = sc.nextLong();  
    }  

    //method to display account details  
    public void showAccount() {  
        System.out.println("Name of account holder: " + name);  
        System.out.println("Account no.: " + accno);  
        System.out.println("Account type: " + type);  
        System.out.println("Balance: " + balance);  
    }  

    //method to deposit money  
    public void deposit() {  
        long amt;  
        System.out.println("Enter the amount you want to deposit: ");  
        amt = sc.nextLong();  
        balance = balance + amt;  
    }  

    //method to withdraw money  
    public void withdrawal() {  
        long amt;  
        System.out.println("Enter the amount you want to withdraw: ");  
        amt = sc.nextLong();  
        if (balance >= amt) {  
            balance = balance - amt;  
            System.out.println("Balance after withdrawal: " + balance);  
        } else {  
            System.out.println("Your balance is less than " + amt + "\tTransaction failed...!!" );  
        }  
    } 

    //method to search an account number  
    public boolean search(String ac_no) {  
        if (accno.equals(ac_no)) {  
            showAccount();  
            return (true);  
        }  
        return (false);  
    }  
}  

public class Bank {  
    public static void main(String arg[]) {  
        Scanner sc = new Scanner(System.in);  

        System.out.print("How many number of customers do you want to input? ");  
        int n = sc.nextInt();  
        BankOperations Cust[] = new BankOperations[n];  
        for (int i = 0; i < Cust.length; i++) {  
            Cust[i] = new BankOperations();  
            Cust[i].openAccount();  
        }  
        
        
        int ch;  
        do {  
            System.out.println("\n ***Banking System Application***");  
            System.out.println("1. Display all account details \n 2. Search by Account number");
            System.out.println("\n 3. Deposit the amount \n 4. Withdraw the amount \n 5.Exit ");  
            System.out.println("Enter your choice: ");  
            ch = sc.nextInt();  
                switch (ch) {  
                    case 1:  
                        for (int i = 0; i < Cust.length; i++) {  
                            Cust[i].showAccount();  
                        }  
                        break;  
                    case 2:  
                        System.out.print("Enter account no. you want to search: ");  
                        String ac_no = sc.next();  
                        boolean found = false;  
                        for (int i = 0; i < Cust.length; i++) {  
                            found = Cust[i].search(ac_no);  
                            if (found) {  
                                break;  
                            }  
                        }  
                        if (!found) {  
                            System.out.println("Search failed! Account doesn't exist..!!");  
                        }  
                        break;  
                    case 3:  
                        System.out.print("Enter Account no. : ");  
                        ac_no = sc.next();  
                        found = false;  
                        for (int i = 0; i < Cust.length; i++) {  
                            found = Cust[i].search(ac_no);  
                            if (found) {  
                                Cust[i].deposit();  
                                break;  
                            }  
                        }  
                        if (!found) {  
                            System.out.println("Search failed! Account doesn't exist..!!");  
                        }  
                        break;  
                    case 4:  
                        System.out.print("Enter Account No : ");  
                        ac_no = sc.next();  
                        found = false;  
                        for (int i = 0; i < Cust.length; i++) {  
                            found = Cust[i].search(ac_no);  
                            if (found) {  
                                Cust[i].withdrawal();  
                                break;  
                            }  
                        }  
                        if (!found) {  
                            System.out.println("Search failed! Account doesn't exist..!!");  
                        }  
                        break;  
                    case 5:  
                        System.out.println("Thank You for using !!!");  
                        break;  
                }  
            }  
            while (ch != 5);  
        }  
    }

Save the above Program with “Bank.Java” then compile it with the following command :

javac Bank.java //to compile the code

java Bank //to run the code

Output is :

How many number of customers do you want to input? 1
Enter Account No: 51234
Enter Account type: Saving
Enter Name: Sunny
Enter Balance: 100000

 ***Banking System Application***
1. Display all account details
 2. Search by Account number
 3. Deposit the amount
 4. Withdraw the amount
 5.Exit
Enter your choice:
3

Enter Account no. : 51234
Name of account holder: Sunny
Account no.: 51234
Account type: Saving
Balance: 100000
Enter the amount you want to deposit:
75453

 ***Banking System Application***
1. Display all account details
 2. Search by Account number
 3. Deposit the amount
 4. Withdraw the amount
 5.Exit
Enter your choice:
1

Name of account holder: Sunny
Account no.: 51234
Account type: Saving
Balance: 175453

 ***Banking System Application***
1. Display all account details
 2. Search by Account number
 3. Deposit the amount
 4. Withdraw the amount
 5.Exit
Enter your choice:
5
Thank You for using !!!