Assignment Help

Question

Hi Everyone newbie here.
I need to write a method that returns the number of coins of the required currency currently stored in a Euro Converter machine. This will be used as follows to give the number of ten cent coins remaining in the machine.
The paramaters that we have to work with are :
@param - currency constant {either EuroMachine.EURO or EuroMachine.STERLING}
@param - the denomination constant (EuroMachine.TENPENCE) etc
@return - the number of coins stored
here is what i have written so far :
public int noCoinsStored(int currency, int coinConstant) {
    noCoinsStored(EuroMachine.EURO,EuroMachine.TENCENT);
    return 0;
  }in the above case Euromachine is the file which holds the value. EURO and TENCENT are final static values. How then can i get java to tell me how many EURO i have in the machine ?
I hope i am making myself clear.

Answer 1

public class EuroMachine {
  private static int EURO = 1;
  private static int STERLING = 2;
  private static int TENPENCE = 10;
  Hashmap coinMap; // Key = currencyType + "_"  + coinType
  public EuroMachine() {
    this.coinMap = new HashMap();
    initialize(EuroMachine.EURO, EuroMachine.TENPENCE);
    initialize(EuroMachine.STERLING, EuroMachine.TENPENCE);
  private void initialize(int currencyType, int coinType) {
    String key = "" + currencyType + "_" + coinType;
    this.coinMap.put(key, new Integer(0));
  public void addCoin(int currencyType, int coinType) {
    String key = "" + currencyType + "_" + coinType;
    int coins = (Integer) coinMap.get(key);  
    coinMap.set(key, new Integer(coins + 1));  
  public void removeCoin(int currencyType, int coinType) {
    String key = "" + currencyType + "_" + coinType;
    int coins = (Integer) coinMap.get(key);  
    if (coins > 0)
      coinMap.set(key, new Integer(coins - 1));  
  public void getRemainingCoins(int currencyType, int coinType) {
    String key = "" + currencyType + "_" + coinType;
    int coins = (Integer) coinMap.get(key);
    return coins; 
}Will accept dukes :-)
OG