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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