Hi Friend,

Try the following code:

1)CurrencyGeneration.java

import java.io.*;
import java.util.*;

class Currency implements Serializable{
public String currency;
public int amount;

public Currency(String currency, int amount){
this.currency = currency;
this.amount = amount;
}
public String toString(){
return currency + amount;
}
public String convertdollarToRupee(int amt){
return "Rs " + amt * 46;
}
}
class Rupee extends Currency{
public Rupee(int amt){
super("Rs ",amt);
}
}
class Dollar extends Currency{
public Dollar(int amt){
super("$ ",amt);
}
}
public class GenerateCurrency{
public static void main(String args[]) throws Exception{
Random ran = new Random();
FileOutputStream fos = new FileOutputStream("currency.txt");
ObjectOutputStream os = new ObjectOutputStream(fos);
System.out.println("Generated Currencies:");
for(int i=1;i<=10;i++){
Object[] obj = { new Rupee(ran.nextInt(100)),new Dollar(ran.nextInt(100))};
Currency currency = (Currency)obj[ran.nextInt(2)];
System.out.println(currency);
os.writeObject(currency);
os.flush();
}
}
}

2)Convert.java

import java.io.*;
import java.util.*;
public class Convert{
public static void main(String args[]) throws Exception{
Currency curr;
FileInputStream fis = new FileInputStream("currency.txt");
ObjectInputStream is = new ObjectInputStream(fis);
System.out.println("Reading from file:");
for(int i=1;i<=10;i++){
curr = (Currency)is.readObject();
if((curr.currency).equals("$")){
System.out.println(curr + " = " + curr.convertdollarToRupee(curr.amount));
}
else{
System.out.println(curr + " = " + curr);
}
}
is.close();
}
}

Thanks