Banking System

import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

public class Banking {
    public static void main(String[] args) {
        Scanner obj=new Scanner(System.in);
        while(true){
            System.out.println("1.Register your Identity");
            System.out.println("2.Login with your credentials!!");
            System.out.println("Enter your choice");
            int n= obj.nextInt();
            int count=0;
            switch(n){
                case 1:{
                    System.out.println("Enter your name");
                    String name= obj.next();
                    int userId=(int)Math.floor(Math.random()*100);
                    while(UserLogin.getUser().containsKey(userId)){
                        userId=(int)Math.floor(Math.random()*1000);
                    }
                    System.out.println("This is your id:"+userId);
                    UserLogin user=new UserLogin(name,userId);
                    System.out.println("Please remember your user ID!!");
                    System.out.println("Deposit an initial amount");
                    int bal=obj.nextInt();
                    if(bal>0 && bal<1000){
                        Amount objAmount=new Amount(userId,bal);
                    }
                    else{
                        System.out.println("Please eneter an amount within 1000");
                        System.exit(0);
                    }
                    System.out.println("You have successfully registered!!!");
                    break;
                }
                case 2:{
                    System.out.println("Enter your user id");
                    int uid= obj.nextInt();
                    if(UserLogin.getUser().containsKey(uid)){
                        System.out.println("Welcome"+UserLogin.getUser().get(uid));
                       count=1;
                    }
                    else
                        System.out.println("Sorry it doesn't match");
                    if(count==1) {
                            System.out.println("1.Deposit");
                            System.out.println("2.Withdraw");
                            System.out.println("3.Balance Enquiry");
                            System.out.println("4.Transfer Amount");
                            System.out.println("Enter your choice");
                            int ch=obj.nextInt();
                            switch(ch){
                                case 1:{
                                    System.out.println("Enter the amount to deposit");
                                    int userAmount=obj.nextInt();
                                    Amount.depo(userAmount);
                                    break;
                                }
                                case 2:{
                                    System.out.println("Enter the amount to withdraw");
                                    int userAmount= obj.nextInt();
                                    Amount.withdraw(userAmount);
                                    break;
                                }
                                case 3:{
                                    System.out.println("Balance receipt");
                                    Amount.balanceEnq(uid);
                                    break;
                                }
                                case 4:{
                                    System.out.println("Enter the id to send the amount");
                                    int id= obj.nextInt();
                                    if(UserLogin.getUser().containsKey(id)){
                                        System.out.println("The receiver name is "+UserLogin.getUser().get(id));
                                        System.out.println("Enter the amount to be transferred");
                                        int rupee=obj.nextInt();
                                        Amount.transferAmount(id,rupee,uid);
                                    }
                                    else {
                                        System.out.println("The receiver doesn't exist!!");
                                    }
                                }
                                default:break;
                            }
                        }
                    break;
                   }
                }
            }
        }
    }
class UserLogin{
    private static String name;
    private static int userId;
    private static Map<Integer,String> user=new HashMap<>();
    UserLogin(String n,int u){
        this.name=n;
        this.userId=u;
        setUser(this.userId,this.name);
    }
    public static Map<Integer, String> getUser() {
        return user;
    }
    public void setUser(int id, String name){
        user.put(id,name);
        System.out.println(user);
    }
}
class Amount{
    private static int balance;
    private static int uid;
    private static Map<Integer,Integer> usBal=new HashMap<>();
    Amount(int u,int b){
        this.uid=u;
        this.balance=b;
        setUsBal(this.uid,this.balance);
    }
    public static void depo(int b){
        balance+=b;
        System.out.println("Total balance"+balance);
//        Amount.getUsBal();
    }
    public void setUsBal(int n,int u){
        usBal.put(n,u);
        System.out.println(usBal);
    }
    public static void withdraw(int b){
        if(b>balance){
            System.out.println("You can't withdraw!!!");
            System.out.println("Try with any other amount");
            System.exit(0);
//            Amount.getUsBal();
        }
        else {
            balance-=b;
            System.out.println("The total balance is "+balance);
        }
    }
        public static  void balanceEnq(int n){
        if(UserLogin.getUser().containsKey(n)){
            System.out.println("YOUR RECEIPT IS BEEN GENERATED");
            System.out.println("The balance is"+getBalance());
            System.out.println("The name of the user"+UserLogin.getUser().get(n));
//            System.out.println(getUsBal());
//            Amount.getUsBal();
        }
        else
            System.out.println("Not found");
       }
    public static int getBalance() {
        return balance;
    }
    public static void transferAmount(int u,int i,int tn){
           int balance1=getUsBal().get(tn);
           if(balance1<=i){
               System.out.println("Can't transfer!!");
               System.exit(0);
           }
           balance1-=i;
        System.out.println("The amount of rupees "+i+"is been debited");
        System.out.println("The total balance is "+balance1);
//          balance=getUsBal().get(u);
//        System.out.println("Before Transfer "+balance);
          balance+=i;
//        System.out.println("After transfer "+balance);
          Amount.getUsBal().replace(u,balance);
        System.out.println("Amount transferred succesfully");
//        Amount.getUsBal();
    }
    public static Map<Integer, Integer> getUsBal() {
//        System.out.println(usBal);
        return usBal;
    }
}