5cf2fe009b
* Use lombok, reformat, and optimize the code * Fix merge conflicts and some sonar issues Co-authored-by: va1m <va1m@email.com>
59 lines
2.5 KiB
Java
59 lines
2.5 KiB
Java
/*
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* The MIT License
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* Copyright © 2014-2021 Ilkka Seppälä
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package com.iluwatar.value.object;
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import lombok.extern.slf4j.Slf4j;
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/**
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* A Value Object are objects which follow value semantics rather than reference semantics. This
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* means value objects' equality are not based on identity. Two value objects are equal when they
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* have the same value, not necessarily being the same object..
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*
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* <p>Value Objects must override equals(), hashCode() to check the equality with values. Value
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* Objects should be immutable so declare members final. Obtain instances by static factory methods.
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* The elements of the state must be other values, including primitive types. Provide methods,
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* typically simple getters, to get the elements of the state. A Value Object must check equality
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* with equals() not ==
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*
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* <p>For more specific and strict rules to implement value objects check the rules from Stephen
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* Colebourne's term VALJO : http://blog.joda.org/2014/03/valjos-value-java-objects.html
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*/
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@Slf4j
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public class App {
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/**
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* This practice creates three HeroStats(Value object) and checks equality between those.
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*/
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public static void main(String[] args) {
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var statA = HeroStat.valueOf(10, 5, 0);
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var statB = HeroStat.valueOf(10, 5, 0);
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var statC = HeroStat.valueOf(5, 1, 8);
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LOGGER.info(statA.toString());
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LOGGER.info("Is statA and statB equal : {}", statA.equals(statB));
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LOGGER.info("Is statA and statC equal : {}", statA.equals(statC));
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}
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}
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