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How do you design a vending machine in Java

Java

public class VendingMachine {
	private int total;
	private int price;
	private int change;

public VendingMachine(int price) {
		this.price = price;
	}

public void insertCoin(int coin) {
		total += coin;
	}

public void getProduct() {
		if (total >= price) {
		    change = total - price;  // calculate the change, if any 
            System.out.println("Here is your product and your change: " + change);  // print the product and the change, if any 
        } else {  // not enough money was inserted, so print an error message 
            System.out.println("Price is: " + price + ", while total is: " + total + ". Please insert more money");  // print an error message 
        }

reset();   // reset the machine for the next customer

}

private void reset() {   // method to reset the machine for the next customer

this.total = 0;   // set total to 0 for next customer's insertion of coins

}

public static void main(String[] args) {   // main method to run/test our code above

VendingMachine vm = new VendingMachine(100);   // create a new vending machine object with a product that costs 100 cents (dollars)

vm.insertCoin(100);   // insert a 100 cents coin into the vending machine (the product costs 100 cents as well, so we expect to get our product and no change back)

vm.getProduct();      // try to get our product from the vending machine (we expect it to be dispensed along with no change since we have inserted exactly 100 cents above)

vm.insertCoin(50);    // insert 50 cents into the vending machine (we still need to insert 50 more cents in order to get our product that costs 100 cents)

vm.getProduct();      // try to get our product from the vending machine (we expect it NOT to be dispensed since we have only inserted 50 cents above and not 100 as required by our product's cost)

vm.insertCoin(50);    // insert another 50 cents into the vending machine (now we have inserted a total of 100 cents which is exactly what we need in order to get our product that costs 100 cents as well)

vm.getProduct();      // try again to get our product from the vending machine (this time we expect it TO be dispensed since we have just inserted another 50 cents above which makes a total of 100 which is exactly what we need in order to buy our product that costs 100 as well). We also expect no change back since we have just paid exactly what was needed in order for us to buy this particular item from this particular vending machine

}      
}

🤖 Code Explanation

This code creates a vending machine object that takes in a price for a product. The user can insert coins into the machine which keeps track of the total. If the total is equal to or greater than the price, the product is dispensed and the user is given their change. If the total is less than the price, an error message is displayed. After the product is dispensed or the error message is displayed, the machine is reset for the next customer.

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How do you design a vending machine in Java

Java

🤖 Code Explanation

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