package BankServices;

public abstract class Operation {
     int data;
     double soldi;

    public Operation ( int data, double soldi){

        this.data=data;
        this.soldi=soldi;

    }

    public abstract String toString();
}
package BankServices;

public class Withdrawal extends Operation {


        public Withdrawal ( int data, double soldi){
            super (data, soldi);

        }
    @Override
    public String toString() {
        // TODO Auto-generated method stub
        return data + "," + soldi +"-";
    }
}
package BankServices;

public class Deposit extends Operation {


    public Deposit( int data,double soldi){
        super ( data, soldi);

    }

    @Override
    public String toString() {
        // TODO Auto-generated method stub
        return data +"," + soldi + "+" ;
    }
}