// The MIT License (MIT)

//

// Copyright (c) 2018 Robert C. Seacord

//

// Permission is hereby granted, free of charge, to any person obtaining a copy

// of this software and associated documentation files (the "Software"), to deal

// in the Software without restriction, including without limitation the rights

// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

// copies of the Software, and to permit persons to whom the Software is

// furnished to do so, subject to the following conditions:

//

// The above copyright notice and this permission notice shall be included in all

// copies or substantial portions of the Software.

//

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

// SOFTWARE.

package MET09J;

import com.google.common.testing.EqualsTester;

import java.util.HashMap;

import java.util.Map;

import java.util.Objects;

final class CreditCard {

private final int number;

private CreditCard(int number) {

this.number = number;

}

// @Override

// public boolean equals(Object o) {

// if (o == this) {

// return true;

// }

// if (!(o instanceof badCreditCard)) {

// return false;

// }

// badCreditCard cc = (badCreditCard)o;

// return cc.number == number;

// }

@Override

public boolean equals(Object o) {

if (this == o) return true;

if (!(o instanceof CreditCard)) return false;

CreditCard that = (CreditCard) o;

return number == that.number;

}

public static void main(String[] args) {

CreditCard cc_a = new CreditCard(100);

CreditCard cc_b = new CreditCard(100);

CreditCard cc_c = new CreditCard(200);

Map<CreditCard, String> m = new HashMap<>();

m.put(cc_a, "4111111111111111");

// The expected retrieved value is 4111111111111111;

// the actual retrieved value is null.

System.out.println(m.get(new CreditCard(100)));

new EqualsTester()

.addEqualityGroup(cc_a, cc_b)

.addEqualityGroup(cc_c)

.testEquals();

}

}

// @Override

// public int hashCode() {

// return Objects.hash(number);

// }