Banking Service

import java.util.*;

public class Main {
public static void main(String[] args) {
Scanner sc=new Scanner(System.in);
System.out.println("=====WELCOME TO OUR BANKING SERVICE====");
System.out.println("Enter your 'Name' and 'CustomerId' to access your Bank account:");
String name=sc.nextLine();
int customerId=sc.nextInt();
BankAccount obj1=new BankAccount(name,customerId);
obj1.menu();
}
}
class BankAccount{
double bal;
double prevTrans;
String customerName;
int customerId;
BankAccount(String customerName,int customerId){
if(customerId==123 && customerName.equals("abc"))
bal=60000;
this.customerName=customerName;
this.customerId=customerId;
}
void deposit(double amount){
if(amount!=0){
bal+=amount;
prevTrans=amount;
System.out.println("!!! Deposited successfully !!!");
}
}
void withdraw(double amt){
if(amt!=0 && bal>=amt){
bal-=amt;
prevTrans=-amt;
System.out.println("!!! Withdrawn successfully !!!");
}
else if(bal<amt){
System.out.println("Bank balance insufficient");
}
}
void getPreTrans(){
if(prevTrans>0){
System.out.println("Deposited: "+prevTrans);
}
else if(prevTrans<0){
System.out.println("Withdrawn: "+Math.abs(prevTrans));
}
else{
System.out.println("No transaction occured");
}
}
void menu(){
char option;
Scanner sc=new Scanner(System.in);

    System.out.println("Welcome "+customerName);
    System.out.println("Your ID:"+customerId);
    System.out.println("\n");
    do{
        System.out.println("a) Check Balance");
        System.out.println("b) Deposit Amount");
        System.out.println("c) Withdraw Amount");
        System.out.println("d) Previous Transaction");
        System.out.println("e) Exit");
        System.out.println("************");
        System.out.println("Choose an option");
        option=sc.next().charAt(0);
        System.out.println("\n");

        switch (option){
            case 'a':
                System.out.println("......................");
                System.out.println("Balance ="+bal);
                System.out.println("......................");
                System.out.println("\n");
                break;
            case 'b':
                System.out.println("......................");
                System.out.println("Enter a amount to deposit :");
                System.out.println("......................");
                double amt=sc.nextDouble();
                deposit(amt);
                System.out.println("\n");
                break;
            case 'c':
                System.out.println("......................");
                System.out.println("Enter a amount to Withdraw :");
                System.out.println("......................");
                double amtW=sc.nextDouble();
                withdraw(amtW);
                System.out.println("\n");
                break;
            case 'd':
                System.out.println("......................");
                System.out.println("Previous Transaction:");
                getPreTrans();
                System.out.println("......................");
                System.out.println("\n");
                break;

            case 'e':
                System.out.println("......................");
                break;
            default:
                System.out.println("Choose a correct option to proceed");
                break;
        }

    }while(option!='e');

    System.out.println("Thank you for using our banking services");
}

}