[source code analysis and design mode 2, 40 pictures and texts, I don't believe you can't understand concurrent programming

4. Specific products

It implements the interface defined by the abstract product role, which is created by the specific factory. It has a many-to-one relationship with the specific factory.

3, Advantages and disadvantages

1. Advantages

  • The multi-level products associated in the product family can be managed together within the class, instead of introducing multiple new classes for management;

  • When adding a new product family, there is no need to modify the original code to meet the opening and closing principle.

2. Shortcomings

When a new product needs to be added to the product family, all factory classes need to be modified.

4, After reading Head First design pattern

1. The abstract factory pattern provides an interface for creating families of related or dependent objects without explicitly specifying specific classes.

2. The factory method pattern uses inheritance, and the abstract factory pattern uses the combination of objects.

5, JDK source code analysis

package com.guor.jdk;



import java.util.Calendar;



public class Factory {

    public static void main(String[] args) {

        Calendar cal = Calendar.getInstance();

        // Note that the month subscript starts from 0, so the month should be + 1

        System.out.println("year:" + cal.get(Calendar.YEAR));

        System.out.println("month:" + (cal.get(Calendar.MONTH) + 1));

        System.out.println("day:" + cal.get(Calendar.DAY_OF_MONTH));

        System.out.println("Time:" + cal.get(Calendar.HOUR_OF_DAY));

        System.out.println("branch:" + cal.get(Calendar.MINUTE));

        System.out.println("second:" + cal.get(Calendar.SECOND));

    }

}

6, Code example

1. UML class diagram

2. Code architecture

3. Specific code

(1) order bag

package com.guor.abstractFactory.order;



import com.guor.abstractFactory.pizza.Pizza;



//Abstract layer (Interface) of an abstract factory pattern

public interface AbsFactory {

	//Let the following factory subclass implement it

	public Pizza createPizza(String orderType);

}

package com.guor.abstractFactory.order;

import com.guor.abstractFactory.pizza.BJCheesePizza;

import com.guor.abstractFactory.pizza.BJPepperPizza;

import com.guor.abstractFactory.pizza.Pizza;

//This is a factory subclass

public class BJFactory implements AbsFactory {

@Override

public Pizza createPizza(String orderType) {

	System.out.println("~The abstract factory pattern is used~");

	Pizza pizza = null;

	if(orderType.equals("cheese")) {

		pizza = new BJCheesePizza();

	} else if (orderType.equals("pepper")){

		pizza = new BJPepperPizza();

	}

	return pizza;

}

}

package com.guor.abstractFactory.order;



import com.guor.abstractFactory.pizza.LDCheesePizza;

import com.guor.abstractFactory.pizza.LDPepperPizza;

import com.guor.abstractFactory.pizza.Pizza;



public class LDFactory implements AbsFactory {

	@Override

	public Pizza createPizza(String orderType) {

		System.out.println("~The abstract factory pattern is used~");

		Pizza pizza = null;

		if (orderType.equals("cheese")) {

			pizza = new LDCheesePizza();

		} else if (orderType.equals("pepper")) {

			pizza = new LDPepperPizza();

		}

		return pizza;

	}

} 

package com.guor.abstractFactory.order;

import com.guor.abstractFactory.pizza.Pizza;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

public class OrderPizza {

AbsFactory factory;

// constructor 

public OrderPizza(AbsFactory factory) {

	setFactory(factory);

}



private void setFactory(AbsFactory factory) {

	Pizza pizza = null;

	String orderType = ""; // User input

	this.factory = factory;

	do {

		orderType = getType();

		// Factory may be a factory subclass in Beijing or a factory subclass in London

		pizza = factory.createPizza(orderType);

		if (pizza != null) { // Order ok

			pizza.prepare();

			pizza.bake();

			pizza.cut();

			pizza.box();

		} else {

			System.out.println("Subscription failed");

			break;

		}

	} while (true);

}



// Write a method to get the type of pizza customers want to order

private String getType() {

	try {

		BufferedReader strin = new BufferedReader(new InputStreamReader(System.in));

		System.out.println("input pizza type:");

		String str = strin.readLine();

		return str;

	} catch (IOException e) {

		e.printStackTrace();

		return "";

	}

}

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Tags: Back-end Programmer

Posted on Mon, 06 Sep 2021 22:27:26 -0400 by shorty114