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java
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package Q1;
import java.util.*;

public class Testing 
{
    public static void main(String[] args)
    {
        int choice=0,limit=100, i=0,j=0, temp=0, k=0, accnum=0, value=0,owner=-1,receiver,location=-1; //i is for saving, j is for current, k is counter 
        String select=null, namesend, status="default", acctype="N/A";
        BankAccount [] s = new SavingAccount[limit];
        BankAccount [] c = new CurrentAccount[limit];

        Random rand = new Random();

        String name,bank;
        try (Scanner scan = new Scanner(System.in))
        {
            while (true) 
            {
                System.out.println("Welcome to Da Bank! What would you like to do today?\n[1- Creating a new account]\n[2- Make Transaction]\n");
                System.out.print("Enter here: ");
                choice=scan.nextInt();
                if(choice==1)//Creating Account
                {
                    temp = rand.nextInt(9999-1001+1)+1001;
                    
                    System.out.print("\nGreetings, Which Account would you like to open?\n[1- Saving Account]\n[2 -Current Account]\nEnter Here: ");
                    choice=scan.nextInt();
                    System.out.print("Insert your name: ");
                    scan.nextLine();
                    name= scan.nextLine(); 
                    System.out.print("Insert your Bank name: ");
                    bank= scan.nextLine();
                    if(choice==1)
                    {
                        for(int a=0 ; a<k ; a++)
                        {   
                            if(c[a]==null)
                            {
                                if(s[a]!=null)
                                {
                                    if(temp==s[a].getAccountNumber() )
                                    {
                                        while(temp==s[a].getAccountNumber())
                                        {
                                            temp = rand.nextInt(9999-1001+1)+1001;
                                            if(temp!=s[a].getAccountNumber())
                                                break;
                                        }
                                    }
                                }
                                
                            }
                            else if(c[a]!=null)
                            {
                                if(s[a]!=null)
                                {
                                    if(temp==s[a].getAccountNumber() || temp== c[a].getAccountNumber())
                                    {
                                        while(temp==s[a].getAccountNumber() || temp== c[a].getAccountNumber())
                                        {
                                            temp = rand.nextInt(9999-1001+1)+1001;
                                            if(temp!=s[a].getAccountNumber() || temp!= c[a].getAccountNumber())
                                                break;
                                        }
                                    }
                                }
                                else if(s[a]==null)
                                {
                                    if(temp==c[a].getAccountNumber() )
                                    {
                                        while(temp==c[a].getAccountNumber())
                                        {
                                            temp = rand.nextInt(9999-1001+1)+1001;
                                            if(temp!=c[a].getAccountNumber())
                                                break;
                                        }
                                    }
                                }
                               
                            }
                            
                        }

                        s[i]= new SavingAccount(name,bank);
                        s[i].setAccountNumber(temp);
                        
                        System.out.println(s[i]);    
                        i++;
                        if(k==0)
                        {
                            owner=0;
                            select="s";
                        }
                            
                    }
                    if(choice==2)
                    {
                        for(int a=0 ; a<k ; a++)
                        {   
                            if(s[a]==null)
                            {
                                if(temp==c[a].getAccountNumber() )
                                {
                                    while(temp==c[a].getAccountNumber())
                                    {
                                        temp = rand.nextInt(9999-1001+1)+1001;
                                        if(temp!=c[a].getAccountNumber())
                                            break;
                                    }
                                }
                            }
                            else if(s[a]!=null)
                            {
                                if(c[a]==null)
                                {
                                    if(temp==s[a].getAccountNumber())
                                    {
                                        while(temp==s[a].getAccountNumber())
                                        {
                                            temp = rand.nextInt(9999-1001+1)+1001;
                                            if(temp!=s[a].getAccountNumber())
                                                break;
                                        }
                                    }
                                }
                                else if(c[a]!=null)
                                {
                                    if(temp==s[a].getAccountNumber() || temp== c[a].getAccountNumber())
                                    {
                                        while(temp==s[a].getAccountNumber() || temp== c[a].getAccountNumber())
                                        {
                                            temp = rand.nextInt(9999-1001+1)+1001;
                                            if(temp!=s[a].getAccountNumber() || temp!= c[a].getAccountNumber())
                                                break;
                                        }
                                    }
                                }
                            }
                            
                        }
                        c[j]= new CurrentAccount(name,bank);
                        c[j].setAccountNumber(temp);
                        System.out.println(c[j]);  
                        j++;
                        if(k==0)
                        {
                            owner=0; 
                            select="c";
                        }
                             
                    }
                    k++;
                    choice =0;
                }
                if(choice == 2)//Make a transaction
                {
                    System.out.print("\nHi! What transaction would you like to make?\n1- Display Credentials\n2- Deposit\n3- Withdraw\n4- Transfer\n\nEnter here: ");
                    choice=scan.nextInt();
                    if(choice==1)//Display stuffs
                    {
                        for(int a =0 ; a<k;a++)
                        {
                            if(c[a]==null)
                            {
                                if(s[a]!=null)
                                {
                                    System.out.println(s[owner]);   
                                }
                                
                            }
                            else if(s[a]==null)
                            {
                                if(c[a]!=null)
                                {
                                    System.out.println(c[owner]);
                                }
                                
                            }
                            else if(c[a]!=null && s[a]!=null)
                            {
                                if(select=="s")
                                {
                                    System.out.println(s[owner]);
                                }
                                if(select=="c")
                                {
                                    System.out.println(c[owner]);
                                }
                            }
                        }
                    }
                    if(choice==2)//Deposit
                    {
                        for(int a =0 ; a<k;a++)
                        {
                            if(c[a]==null)
                            {
                                if(s[a]!=null)
                                {
                                    System.out.println("How much do you want to deposit?");
                                    System.out.print("\nEnter here: ");
                                    value=scan.nextInt();
                                    s[owner].setBalance(s[owner].getBalance()+(double)value);
                                }
                                
                            }
                            else if(s[a]==null)
                            {
                                if(c[a]!=null)
                                {
                                    if(accnum==c[a].getAccountNumber())
                                    {
                                        System.out.println("How much do you want to deposit?");
                                        System.out.print("\nEnter here: ");
                                        value=scan.nextInt();
                                        c[owner].setBalance(c[owner].getBalance()+(double)value);
                                    }
                                }
                                
                            }
                            else if(c[a]!=null && s[a]!=null)
                            {
                                if(select=="s")
                                {
                                    System.out.println("How much do you want to deposit?");
                                    System.out.print("\nEnter here: ");
                                    value=scan.nextInt();
                                    s[owner].setBalance(s[owner].getBalance()+(double)value);
                                }
                                if(select=="c")
                                {
                                    System.out.println("How much do you want to deposit?");
                                    System.out.print("\nEnter here: ");
                                    value=scan.nextInt();
                                    c[owner].setBalance(c[owner].getBalance()+(double)value);
                                }
                            }
                        }
                    }
                    if(choice==3)//Withdrawal
                    {
                        for(int a =0 ; a<k;a++)
                        {
                            if(c[a]==null)
                            {
                                if(s[a]!=null)
                                {
                                    System.out.println("How much do you want to withdraw?");
                                    System.out.print("\nEnter here: ");
                                    value=scan.nextInt();
                                    s[owner].setBalance(s[owner].getBalance()-(double)value);
                                }
                                
                            }
                            else if(s[a]==null)
                            {
                                if(c[a]!=null)
                                {
                                    if(accnum==c[a].getAccountNumber())
                                    {
                                        System.out.println("How much do you want to withdraw?");
                                        System.out.print("\nEnter here: ");
                                        value=scan.nextInt();
                                        c[owner].setBalance(c[owner].getBalance()-(double)value);
                                    }
                                }
                                
                            }
                            else if(c[a]!=null && s[a]!=null)
                            {
                                if(select=="s")
                                {
                                    System.out.println("How much do you want to withdraw?");
                                    System.out.print("\nEnter here: ");
                                    value=scan.nextInt();
                                    s[owner].setBalance(s[owner].getBalance()-(double)value);
                                }
                                if(select=="c")
                                {
                                    System.out.println("How much do you want to withdraw?");
                                    System.out.print("\nEnter here: ");
                                    value=scan.nextInt();
                                    c[owner].setBalance(c[owner].getBalance()-(double)value);
                                }
                            }
                        }
                    }
                    if(choice==4)//Transfer
                    {
                        while(true)
                        {
                            try
                            {
                                System.out.print("Please enter an amount you want to transfer: ");
                                value =scan.nextInt();
                                scan.nextLine();
                                System.out.print("Please enter name of a sender: ");
                                namesend =scan.nextLine();
                                System.out.print("Please enter the receiver account: ");
                                receiver = scan.nextInt();
                                if(select =="s")
                                {
                                    if(value>s[owner].getBalance())
                                    {
                                        throw new Exception("Withdrawal Exceeded Balance");
                                    }
                                    for(int a=0 ; a<k ;a++)
                                    {
                                        
                                        if(c[a]==null)
                                        {
                                            if(receiver!=s[a].getAccountNumber())
                                                status="No";
                                            else if(receiver==s[a].getAccountNumber())
                                            {
                                                status="Yes";
                                                acctype="s";
                                                location=a;
                                                break;
                                            }
                                        }
                                        else if(c[a]!=null)
                                        {
                                            if(receiver!=s[a].getAccountNumber())
                                                status="No";
                                            else if(receiver==s[a].getAccountNumber())
                                            {
                                                status="Yes";
                                                acctype="s";
                                                location=a;
                                                break;
                                            }

                                            if(receiver!=c[a].getAccountNumber())
                                                status="No";
                                            else if(receiver==c[a].getAccountNumber())
                                            {
                                                status="Yes";
                                                acctype="c";
                                                location=a;
                                                break;
                                            }
                                        }
                                        
                                            
                                    }
                                    if(status=="No")
                                        throw new Exception("Account is not exist");
                                }
                                if(select =="c")
                                {
                                    if(value>c[owner].getBalance())
                                    {
                                        throw new Exception("Withdrawal Exceeded Balance");
                                    }
                                    for(int a=0 ; a<k ;a++)
                                    {
                                        
                                        if(c[a]==null)
                                        {
                                            if(receiver!=s[a].getAccountNumber())
                                                status="No";
                                            else if(receiver==s[a].getAccountNumber())
                                            {
                                                status="Yes";
                                                acctype="s";
                                                location=a;
                                                break;
                                            }
                                        }
                                        else if(c[a]!=null)
                                        {
                                            if(receiver!=s[a].getAccountNumber())
                                                status="No";
                                            else if(receiver==s[a].getAccountNumber())
                                            {
                                                status="Yes";
                                                acctype="s";
                                                location=a;
                                                break;
                                            }

                                            if(receiver!=c[a].getAccountNumber())
                                                status="No";
                                            else if(receiver==c[a].getAccountNumber())
                                            {
                                                status="Yes";
                                                acctype="c";
                                                location=a;
                                                break;
                                            }
                                        }
                                        
                                            
                                    }
                                    if(status=="No")
                                        throw new Exception("Account is not exist");
                                }
                                System.out.println("Status: Completed");
                                break;
                            }catch(InputMismatchException e){
                            System.out.println("Invalid Entry");
                            }catch(Exception e){
                            System.out.println("Status: Incompleted " + e.getMessage());
                            }
                        }
                        if(select=="s")
                        {
                            if(acctype=="s")
                            {
                                s[owner].setBalance(s[owner].getBalance()-(double)value);
                                s[location].setBalance(s[location].getBalance()-(double)value);
                            }
                            else if(acctype=="c")
                            {
                                s[owner].setBalance(s[owner].getBalance()-(double)value);
                                c[location].setBalance(c[location].getBalance()-(double)value);
                            }
                        }
                        if(select=="c")
                        {
                            if(acctype=="s")
                            {
                                c[owner].setBalance(c[owner].getBalance()-(double)value);
                                s[location].setBalance(s[location].getBalance()-(double)value);
                            }
                            else if(acctype=="c")
                            {
                                c[owner].setBalance(c[owner].getBalance()-(double)value);
                                c[location].setBalance(c[location].getBalance()-(double)value);
                            }
                        }
                        
                    }

                }
                System.out.print("\nWould you like to continue? [1- Yes || 0-No]\nEnter Here: ");
                choice=scan.nextInt();
                if(choice == 0)
                    break;
            }
                
        }    
    }
        
}

class BankAccount
{
    protected String fullName, BankName,accType;
    protected int accountNumber;
    protected Double interestRate, balance;


    public BankAccount(String fullName, String bankName) {
        this.fullName = fullName;
        BankName = bankName;
        
    }
   
    public BankAccount() {
    }

    public String getFullName() {
        return fullName;
    }
    public void setFullName(String fullName) {
        this.fullName = fullName;
    }
    public String getBankName() {
        return BankName;
    }
    public void setBankName(String bankName) {
        BankName = bankName;
    }
    public int getAccountNumber() {
        return accountNumber;
    }
    public void setAccountNumber(int accountNumber) {
        this.accountNumber = accountNumber;
    }
    public String getAccType() {
        return accType;
    }
    public void setAccType(String accType) {
        this.accType = accType;
    }
    public Double getInterestRate() {
        return interestRate;
    }
    public void setInterestRate(Double interestRate) {
        
        this.interestRate = interestRate;
    }
    public Double getBalance() {
        return balance;
    }
    public void setBalance(Double balance) {
        
        this.balance = balance;
    }

    @Override
    public String toString() {
        return "\nYour Details \nfullName=" + fullName + "\nBankName=" + BankName + "\naccountNumber=" + accountNumber
                + "\naccType=" + accType + "\ninterestRate=" + interestRate + "\nbalance=" + balance ;
    }
}

class SavingAccount extends BankAccount 
{   

    double Newbalance=50;
    double NewinterestRate = 0.0005;

    public SavingAccount(){
       super();
    }

    public SavingAccount(String name, String BankName){
        
        super(name, BankName);
        this.setBalance(Newbalance);
        this.setInterestRate(NewinterestRate);
        this.setAccType("Saving Account");

    }
}

class CurrentAccount extends BankAccount 
{

    double Newbalance=200;
    double NewinterestRate = 0.0001;

    public CurrentAccount(){
        super();
    }

    public CurrentAccount(String name, String BankName)
    {
        super(name, BankName);
        this.setBalance(Newbalance);
        this.setInterestRate(NewinterestRate);
        this.setAccType("Current Account");
    }
   
}