CmdInsertCoin.java

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public class CmdInsertCoin implements Command {
 
    @Override
    public String execute(VendingMachine v, String[] cmdParts) {
        Integer c = Integer.valueOf(cmdParts[1]);
        // Add the coin to Coin Slot
        v.insertCoin(c);
        // Do something
        // return a string "Inserted a $x coin. $y in total."
        return "Inserted a $" + c + " coin. $" + v.getTotalInsertedCoinsAmount() + " in total.";
        // x and y must be replaced by an appropriate value
 
    }
}