Question

Can you modify this code so that it display the number of coins and subtotal for each type of coin(dimes, penny, quarter, nickel) and the total value in the wallet. But still reads the data from file coins.txt. Which is below MyCode.

The original question was this:

Two classes are given: Coin and Wallet. Write an application named MyWallet.java that reads all coins from a data file named coins.txt. The first line in the data file contains the number of coins (N) in the file, followed by N lines containing N numbers each represents a coin. You need to create a coin object from each number then create a Wallet object. At the end of your application, display number of coins and subtotal for each type, and total value in the wallet.

MyCode:

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
public class MyWalletScratch {
public static void main(String[] args) {
File inFile = null;
if (0 < args.length) {
inFile = new File(args[0]);
BufferedReader br = null;
try {
String sCurrentLine;
br = new BufferedReader(new FileReader(inFile));
int numberOfCoins = Integer.parseInt(br.readLine());
Coin[] coins = new Coin[numberOfCoins];//Initialize coin array
System.out.println("Number Of coins: " + numberOfCoins+" Coins in Wallet: ");
int i = 0;
while ((sCurrentLine = br.readLine()) != null) {
System.out.println(sCurrentLine);
Coin coin = new Coin(Integer.parseInt(sCurrentLine));//create coin
coins[i] = coin;//add coin to coins array
i++;
}
Wallet walet=new Wallet(coins);//Create wallet
System.out.println("Total In My Wallet: "+walet.totalValue());
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (br != null)
br.close();
} catch (IOException ex) {
ex.printStackTrace();
}
}
} else {//exit if no cmd arguments are provided
System.err.println("Invalid arguments count:" + args.length);
System.exit(1);
}
}
}

coins.txt

10
5
10
1
25
5
1
25
25
25
10

Answer 1

If you have any douhbts, please give me comment...

import java.io.*;

import java.util.*;

public class MyWalletScratch {

public static void main(String[] args) {

if (0 < args.length) {

try {

Scanner sc = new Scanner(new File(args[0]));

int numberOfCoins = sc.nextInt();

Coin[] coins = new Coin[numberOfCoins]; // Initialize coin array

System.out.println("Number Of coins: " + numberOfCoins + " Coins in Wallet: ");

int i = 0;

while (sc.hasNextInt()) {

Coin coin = new Coin(sc.nextInt()); // create coin

coins[i] = coin; // add coin to coins array

i++;

}

Wallet walet = new Wallet(coins); // Create wallet

System.out.println("Total In My Wallet: " + walet.totalValue());

sc.close();

} catch (FileNotFoundException e) {

e.printStackTrace();

}

} else { // exit if no cmd arguments are provided

System.err.println("Invalid arguments count:" + args.length);

System.exit(1);

}

}

}