Tutoriais - Programação Orientada a ObjetosPara exercitar a utilização do padrão de projeto Factory Method, desenvolva uma fábrica de motores, que construa motores de aço, de alumínio e elétricos.
O Product é um motor.
Os ConcreteProduct são os motores de aço, de alumínio e elétricos.
Os motores de alumínio podem ser de 3 ou 6 cilindros.
Os motores de aço podem ser de 4 ou 8 cilindros.
Os motores elétricos não possuem cilindros.
O Creator é o metalúrgico.
Os ConcreteCreator são os metalúrgicos alemão, brasileiro e japonês.
O metalúrgico alemão cria motores de alumínio.
O metalúrgico brasileiro cria motores de aço.
O metalúrgico japonês cria motores elétricos.
/*************************************************************************
* Copyright (C) 2009/2024 - Cristiano Lehrer (cristiano@ybadoo.com.br) *
* Ybadoo - Solucoes em Software Livre (ybadoo.com.br) *
* *
* Permission is granted to copy, distribute and/or modify this document *
* under the terms of the GNU Free Documentation License, Version 1.3 or *
* any later version published by the Free Software Foundation; with no *
* Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A *
* A copy of the license is included in the section entitled "GNU Free *
* Documentation License". *
* *
* Ubuntu 16.10 (GNU/Linux 4.8.0-39-generic) *
* OpenJDK Version "1.8.0_121" *
* OpenJDK 64-Bit Server VM (build 25.121-b13, mixed mode) *
*************************************************************************/
package com.ybadoo.tutoriais.poo.tutorial08.exercicio11;
/**
* Especificacao do motor
*
* Product define a interface de objetos que o metodo factory cria
* (Gamma, 2000).
*/
public interface Engine
{
/**
* Retornar o numero de cilindros do motor
*
* @return numero de cilindros do motor
*/
public int cylinders();
}/*************************************************************************
* Copyright (C) 2009/2024 - Cristiano Lehrer (cristiano@ybadoo.com.br) *
* Ybadoo - Solucoes em Software Livre (ybadoo.com.br) *
* *
* Permission is granted to copy, distribute and/or modify this document *
* under the terms of the GNU Free Documentation License, Version 1.3 or *
* any later version published by the Free Software Foundation; with no *
* Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A *
* A copy of the license is included in the section entitled "GNU Free *
* Documentation License". *
* *
* Ubuntu 16.10 (GNU/Linux 4.8.0-39-generic) *
* OpenJDK Version "1.8.0_121" *
* OpenJDK 64-Bit Server VM (build 25.121-b13, mixed mode) *
*************************************************************************/
package com.ybadoo.tutoriais.poo.tutorial08.exercicio11;
/**
* Especificacao do motor de aluminio
*
* ConcreteProduct implementa a interface de Product (Gamma, 2000).
*/
public class AluminumEngine implements Engine
{
/**
* Numero de cilindros do motor de aluminio
*/
private int cylinders;
/**
* Inicializar o motor de aluminio
*
* @param cylinders numero de cilindros do motor de aluminio
*/
public AluminumEngine(int cylinders)
{
if((cylinders == 3) || (cylinders == 6))
{
this.cylinders = cylinders;
}
else
{
throw new IllegalArgumentException("O número de cilindros do " +
"motor de alumínio deve ser 3 ou 6");
}
}
/* (non-Javadoc)
* @see com.ybadoo.tutoriais.poo.tutorial08.exercicio11.Engine#cylinders()
*/
@Override
public int cylinders()
{
return cylinders;
}
/* (non-Javadoc)
* @see java.lang.Object#toString()
*/
@Override
public String toString()
{
return "Motor de alumínio de " + cylinders + " cilindros";
}
}/*************************************************************************
* Copyright (C) 2009/2024 - Cristiano Lehrer (cristiano@ybadoo.com.br) *
* Ybadoo - Solucoes em Software Livre (ybadoo.com.br) *
* *
* Permission is granted to copy, distribute and/or modify this document *
* under the terms of the GNU Free Documentation License, Version 1.3 or *
* any later version published by the Free Software Foundation; with no *
* Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A *
* A copy of the license is included in the section entitled "GNU Free *
* Documentation License". *
* *
* Ubuntu 16.10 (GNU/Linux 4.8.0-39-generic) *
* OpenJDK Version "1.8.0_121" *
* OpenJDK 64-Bit Server VM (build 25.121-b13, mixed mode) *
*************************************************************************/
package com.ybadoo.tutoriais.poo.tutorial08.exercicio11;
/**
* Especificacao do motor de aco
*
* ConcreteProduct implementa a interface de Product (Gamma, 2000).
*/
public class SteelEngine implements Engine
{
/**
* Numero de cilindros do motor de aco
*/
private int cylinders;
/**
* Inicializar o motor de aco
*
* @param cylinders numero de cilindros do motor de aco
*/
public SteelEngine(int cylinders)
{
if((cylinders == 4) || (cylinders == 8))
{
this.cylinders = cylinders;
}
else
{
throw new IllegalArgumentException("O número de cilindros do motor " +
"de aço deve ser 4 ou 8");
}
}
/* (non-Javadoc)
* @see com.ybadoo.tutoriais.poo.tutorial08.exercicio11.Engine#cylinders()
*/
@Override
public int cylinders()
{
return cylinders;
}
/* (non-Javadoc)
* @see java.lang.Object#toString()
*/
@Override
public String toString()
{
return "Motor de aço de " + cylinders + " cilindros";
}
}/*************************************************************************
* Copyright (C) 2009/2024 - Cristiano Lehrer (cristiano@ybadoo.com.br) *
* Ybadoo - Solucoes em Software Livre (ybadoo.com.br) *
* *
* Permission is granted to copy, distribute and/or modify this document *
* under the terms of the GNU Free Documentation License, Version 1.3 or *
* any later version published by the Free Software Foundation; with no *
* Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A *
* A copy of the license is included in the section entitled "GNU Free *
* Documentation License". *
* *
* Ubuntu 16.10 (GNU/Linux 4.8.0-39-generic) *
* OpenJDK Version "1.8.0_121" *
* OpenJDK 64-Bit Server VM (build 25.121-b13, mixed mode) *
*************************************************************************/
package com.ybadoo.tutoriais.poo.tutorial08.exercicio11;
/**
* Especificacao do motor eletrico
*
* ConcreteProduct implementa a interface de Product (Gamma, 2000).
*/
public class ElectricEngine implements Engine
{
/**
* Inicializar o motor eletrico
*/
public ElectricEngine()
{
// Nenhum atributo a ser inicializado
}
/* (non-Javadoc)
* @see com.ybadoo.tutoriais.poo.tutorial08.exercicio11.Engine#cylinders()
*/
@Override
public int cylinders()
{
return 0;
}
/* (non-Javadoc)
* @see java.lang.Object#toString()
*/
@Override
public String toString()
{
return "Motor elétrico";
}
}/*************************************************************************
* Copyright (C) 2009/2024 - Cristiano Lehrer (cristiano@ybadoo.com.br) *
* Ybadoo - Solucoes em Software Livre (ybadoo.com.br) *
* *
* Permission is granted to copy, distribute and/or modify this document *
* under the terms of the GNU Free Documentation License, Version 1.3 or *
* any later version published by the Free Software Foundation; with no *
* Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A *
* A copy of the license is included in the section entitled "GNU Free *
* Documentation License". *
* *
* Ubuntu 16.10 (GNU/Linux 4.8.0-39-generic) *
* OpenJDK Version "1.8.0_121" *
* OpenJDK 64-Bit Server VM (build 25.121-b13, mixed mode) *
*************************************************************************/
package com.ybadoo.tutoriais.poo.tutorial08.exercicio11;
/**
* Especificacao do metalurgico
*
* Creator declara o metodo factory o qual retorna um objeto do tipo
* Product. Creator pode tambem definir uma implementacao por
* omissao do metodo factory que retorna por omissao um objeto
* ConcreteProduct. Pode chamar o metodo factory para criar um
* objeto Product (Gamma, 2000).
*/
public abstract class Metallurgist
{
/**
* Construir o motor (metodo factory)
*
* @param cylinders numero de cilindros do motor
* @return motor
*/
protected abstract Engine buildEngine(int cylinders);
/**
* Retornar o motor especificado pelo usuario
*
* @param cylinders numero de cilindros do motor
* @return motor especificado pelo usuario
*/
public static Engine getEngine(int cylinders)
{
Metallurgist metallurgist = null;
if(cylinders == 0)
{
metallurgist = new JapaneseMetallurgist();
}
else if((cylinders == 3) || (cylinders == 6))
{
metallurgist = new GermanMetallurgist();
}
else if((cylinders == 4) || (cylinders == 8))
{
metallurgist = new BrazilianMetallurgist();
}
else
{
throw new IllegalArgumentException("O número de cilindros do motor " +
"é inválido");
}
return metallurgist.buildEngine(cylinders);
}
}/*************************************************************************
* Copyright (C) 2009/2024 - Cristiano Lehrer (cristiano@ybadoo.com.br) *
* Ybadoo - Solucoes em Software Livre (ybadoo.com.br) *
* *
* Permission is granted to copy, distribute and/or modify this document *
* under the terms of the GNU Free Documentation License, Version 1.3 or *
* any later version published by the Free Software Foundation; with no *
* Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A *
* A copy of the license is included in the section entitled "GNU Free *
* Documentation License". *
* *
* Ubuntu 16.10 (GNU/Linux 4.8.0-39-generic) *
* OpenJDK Version "1.8.0_121" *
* OpenJDK 64-Bit Server VM (build 25.121-b13, mixed mode) *
*************************************************************************/
package com.ybadoo.tutoriais.poo.tutorial08.exercicio11;
/**
* Metalurgico alemao
*
* ConcreteCreator redefine (overrides) o metodo factory para retornar
* uma instancia de um ConcreteProduct (Gamma, 2000).
*/
public class GermanMetallurgist extends Metallurgist
{
/* (non-Javadoc)
* @see com.ybadoo.tutoriais.poo.tutorial08.exercicio11.Metallurgist#buildEngine(int)
*/
@Override
protected Engine buildEngine(int cylinders)
{
return new AluminumEngine(cylinders);
}
}/*************************************************************************
* Copyright (C) 2009/2024 - Cristiano Lehrer (cristiano@ybadoo.com.br) *
* Ybadoo - Solucoes em Software Livre (ybadoo.com.br) *
* *
* Permission is granted to copy, distribute and/or modify this document *
* under the terms of the GNU Free Documentation License, Version 1.3 or *
* any later version published by the Free Software Foundation; with no *
* Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A *
* A copy of the license is included in the section entitled "GNU Free *
* Documentation License". *
* *
* Ubuntu 16.10 (GNU/Linux 4.8.0-39-generic) *
* OpenJDK Version "1.8.0_121" *
* OpenJDK 64-Bit Server VM (build 25.121-b13, mixed mode) *
*************************************************************************/
package com.ybadoo.tutoriais.poo.tutorial08.exercicio11;
/**
* Metalurgico brasileiro
*
* ConcreteCreator redefine (overrides) o metodo factory para retornar
* uma instancia de um ConcreteProduct (Gamma, 2000).
*/
public class BrazilianMetallurgist extends Metallurgist
{
/* (non-Javadoc)
* @see com.ybadoo.tutoriais.poo.tutorial08.exercicio11.Metallurgist#buildEngine(int)
*/
@Override
protected Engine buildEngine(int cylinders)
{
return new SteelEngine(cylinders);
}
}/*************************************************************************
* Copyright (C) 2009/2024 - Cristiano Lehrer (cristiano@ybadoo.com.br) *
* Ybadoo - Solucoes em Software Livre (ybadoo.com.br) *
* *
* Permission is granted to copy, distribute and/or modify this document *
* under the terms of the GNU Free Documentation License, Version 1.3 or *
* any later version published by the Free Software Foundation; with no *
* Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A *
* A copy of the license is included in the section entitled "GNU Free *
* Documentation License". *
* *
* Ubuntu 16.10 (GNU/Linux 4.8.0-39-generic) *
* OpenJDK Version "1.8.0_121" *
* OpenJDK 64-Bit Server VM (build 25.121-b13, mixed mode) *
*************************************************************************/
package com.ybadoo.tutoriais.poo.tutorial08.exercicio11;
/**
* Metalurgico japones
*
* ConcreteCreator redefine (overrides) o metodo factory para retornar
* uma instancia de um ConcreteProduct (Gamma, 2000).
*/
public class JapaneseMetallurgist extends Metallurgist
{
/* (non-Javadoc)
* @see com.ybadoo.tutoriais.poo.tutorial08.exercicio11.Metallurgist#buildEngine(int)
*/
@Override
protected Engine buildEngine(int cylinders)
{
return new ElectricEngine();
}
}/*************************************************************************
* Copyright (C) 2009/2024 - Cristiano Lehrer (cristiano@ybadoo.com.br) *
* Ybadoo - Solucoes em Software Livre (ybadoo.com.br) *
* *
* Permission is granted to copy, distribute and/or modify this document *
* under the terms of the GNU Free Documentation License, Version 1.3 or *
* any later version published by the Free Software Foundation; with no *
* Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A *
* A copy of the license is included in the section entitled "GNU Free *
* Documentation License". *
* *
* Ubuntu 16.10 (GNU/Linux 4.8.0-39-generic) *
* OpenJDK Version "1.8.0_121" *
* OpenJDK 64-Bit Server VM (build 25.121-b13, mixed mode) *
*************************************************************************/
package com.ybadoo.tutoriais.poo.tutorial08.exercicio11;
/**
* Classe responsavel pela execucao do padrao Factory Method
*/
public class Application
{
/**
* Construtor para inicializar a execucao do padrao Factory Method
*/
private Application()
{
}
/**
* Metodo principal da linguagem de programacao Java
*
* @param args argumentos da linha de comando (nao utilizado)
*/
public static void main(String[] args)
{
Engine electricEngine = Metallurgist.getEngine(0);
System.out.println(electricEngine);
Engine aluminumEngine = Metallurgist.getEngine(3);
System.out.println(aluminumEngine);
Engine steelEngine = Metallurgist.getEngine(4);
System.out.println(steelEngine);
}
}Gamma, Erich. (2000). Padrões de Projeto: soluções reutilizáveis de software orientado a objetos. Porto Alegre: Bookman. 364 páginas.
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