bank database

//bank database
import java.util.Scanner; 
class account 
{ int balance; account(int balance) 
{ this.balance=balance; 
} 
public int getBalance() 
{ return balance; 
} synchronized public void update(int amt) 
{ this.balance+=amt; 
} } class withdraw extends Thread 
{ account a; withdraw(account a) 
{ this.a=a; 
} 
public void run() 
{ 
Scanner s=new Scanner(System.in); 
System.out.println("Enter withdraw amount : "); int amt=s.nextInt(); s.nextLine(); if(amt<=a.getBalance()) 
{ 
a.update(-amt); 
System.out.println("Current balance : "+a.getBalance()); 
} else 
System.out.println("Insufficient funds!"); } } class deposit extends Thread 
{ account a; deposit(account a) 
{ this.a=a; 
} 
public void run() 
{ 
Scanner s=new Scanner(System.in); 
System.out.println("Enter deposit amount : "); int amt=s.nextInt(); s.nextLine(); 
a.update(amt); 
System.out.println("Current balance : "+a.getBalance()); } } 
public class bank 
{ public static void main(String[] args) 
{ 
Scanner s=new Scanner(System.in); 
System.out.println("Enter the account balance : "); int balance=s.nextInt(); account a=new account(balance); char c; do 
{ 
System.out.println("Bank"); 
System.out.println("1. Withdraw"); 
System.out.println("2. Deposit"); System.out.println("Entre your choice : "); int ch=s.nextInt(); 
s.nextLine(); try 
{ switch(ch) 
{ case 1: withdraw w=new withdraw(a); 
w.start(); 
w.join(); break; 
case 2: deposit d=new deposit(a); 
d.start(); 
d.join(); break; 
default:System.out.println("Invalid command!"); } } catch(Exception e) 
{ 
System.out.println(e); 
} 
System.out.println("Would you like to continue?(y/n) : "); c=s.nextLine().charAt(0); }while(c=='y'||c=='Y'); s.close(); 
} 
}