Detailed explanation of the specific code to implement the abstract factory pattern in Java

Abstract Factory Pattern

There are several concepts in it:Abstract Factory,Entity Factory,Abstract product,Entity product

Abstract factory: Define the abstract method to create a product

Entity factory: Specifically what kind of product to create

Abstract product: An interface or base class

Entity product: Implement specific functions, or derive

Class Diagram

//抽象产品1 public interface IProduct1 { public void show(); }

//抽象产品2 public interface IProduct2 { public void show(); }

//实体产品1 public class Product1 implements IProduct1 { public void show() { System.out.println("创建了1型产品"); } }

//实体产品2 public class Product2 implements IProduct2 { public void show() { System.out.println("创建了2型产品"); } }

/* * 1A 1B属于Product1 同一产品等级结构中 * 2A 2B属于Product2 */ public class GradeProduct1A extends Product1 { @Override public void show() { super.show(); System.out.println("这是产品1下的:产品A"); } }

public class GradeProduct1B extends Product1 { @Override public void show() { super.show(); System.out.println("这是产品1下的:产品B"); } }

public class GradeProduct2A extends Product2 { @Override public void show() { super.show(); System.out.println("这是产品2下的:产品A"); } }

public class GradeProduct2B extends Product2 { @Override public void show() { super.show(); System.out.println("这是产品2下的:产品B"); } }

//抽象工厂 创建不同的抽象产品 public interface IFactory { public IProduct1 createProduct1A();//1类产品 型号A public IProduct1 createProduct1B();//1类产品 型号B public IProduct2 createProduct2A();//2类产品 型号A public IProduct2 createProduct2B();//2类产品 型号B }

//实体工厂 创建实体产品，返回类型为抽象产品 public class Factory implements IFactory { public IProduct1 createProduct1A() { return new GradeProduct1A(); } public IProduct1 createProduct1B() { return new GradeProduct1B(); } public IProduct2 createProduct2A() { return new GradeProduct2A(); } public IProduct2 createProduct2B() { return new GradeProduct2B(); } }

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