Java
javaTutorial
Code examples on the definition and usage of template method patterns in Java classic design patterns
Code examples on the definition and usage of template method patterns in Java classic design patterns
This article mainly introduces the template method pattern of Java's classic design pattern, briefly explains the principle and definition of the template method pattern, and analyzes the specific usage of the java template method pattern in the form of examples. Friends in need can refer to it.
The examples in this article describe the template method pattern of Java design patterns. Share it with everyone for your reference, the details are as follows:
In our lives, many things include specific steps. If you go to a bank to handle business, the usual sequence of steps is: take a number –> fill in the form –> wait for your number to be called –> handle the business. Among these steps, some remain unchanged, such as taking a number, which must be taken by everyone, but some have to change, such as filling out forms, but depending on the business, the documents to be filled out are different. Another example is when we go out to eat, the general steps are: order -> wait -> eat -> pay. The same pattern can also be found. There are countless such things.
During project development, we may also encounter such a situation. Multiple functional modules may have similar or identical operation steps, but one link or step is different. We can extract one or Multiple common parent classes (templates) allow subclasses to implement specific methods. Let's take going to the bank to handle business as an example:
Simulated abstract class:
/**
* 模板方法模式的模板框架(以去银行办理业务为例)
* @description：
*/
public abstract class TempletBankFrame {
/* 比如：去柜台办理银行卡业务* */
public final void handleBankCard() {
/* 第一步：进入银行大厅取号* */
takeNumber();
/* 第二步：填写办理业务的相关单据* */
if(!isNeedThisMethod()){//特殊情况可以添加判断，如我之前有填写好单子，那今天就不必再填写了
writeBill();
}
/* 第三步：等待工作人员叫号* */
waitCall();
/* 第四步：办理业务* */
handleCard();
}
/* 取号步骤是不需要更改的，所以我们用private修饰* */
private void takeNumber() {
System.out.println("办理银行业务请取号！");
}
/* 办理的业务不同，填写的内容不同，所以我们用protected修饰，让子类去处理具体业务* */
protected abstract void writeBill();
/* 等待叫号步骤也是不需要更改的，所以我们用private修饰* */
private void waitCall() {
System.out.println("办理银行业务请取号！");
}
/* 办理的业务不同，用protected修饰，让子类去处理具体业务* */
protected abstract void handleCard();
/*定义一个钩子方法：由抽象类声明并实现，而子类会加以扩展。通常抽象类给出的实现是一个空实现，作为方法的默认实现。**/
protected abstract boolean isNeedThisMethod();
}Concrete implementation class: For example, handling money withdrawals
/**
* 办理取钱业务
* @description：
*/
public class GetMoney extends TempletBankFrame {
@Override
protected void writeBill() {
System.out.println("我在填写取钱的单据！");
}
@Override
protected void handleCard() {
System.out.println("我要取500万大洋");
}
@Override
protected boolean isNeedThisMethod() {
System.out.println("我已经填写过单子，今天就直接等待叫号了吧！");
return true;
}
}Specific implementation class: For example, I am going to apply for a bank card
/**
* 办理银行卡
* @description：
*/
public class TackCard extends TempletBankFrame {
@Override
protected void writeBill() {
System.out.println("我填写的是办理银行卡单据");
}
@Override
protected void handleCard() {
System.out.println("我在办卡，即将完成！");
}
@Override
protected boolean isNeedThisMethod() {
return false;
}
}Test class
/**
* 模板方法模式测试类
* @description：
*/
public class Test {
public static void main(String[] args) {
GetMoney money=new GetMoney();
money.handleBankCard();//调用模板中的办理业务方法
System.out.println("———–分隔线—————-");
TackCard card=new TackCard();
card.handleBankCard();
}
}The final output result:
办理银行业务请取号！ 我已经填写过单子，今天就直接等待叫号了吧！ 办理银行业务请取号！ 我要取500万大洋 ———–分隔线—————- 办理银行业务请取号！ 我填写的是办理银行卡单据 办理银行业务请取号！ 我在办卡，即将完成！
The above is the detailed content of Code examples on the definition and usage of template method patterns in Java classic design patterns. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
Java Spring Interview Questions
Aug 30, 2024 pm 04:29 PM
In this article, we have kept the most asked Java Spring Interview Questions with their detailed answers. So that you can crack the interview.
Break or return from Java 8 stream forEach?
Feb 07, 2025 pm 12:09 PM
Java 8 introduces the Stream API, providing a powerful and expressive way to process data collections. However, a common question when using Stream is: How to break or return from a forEach operation? Traditional loops allow for early interruption or return, but Stream's forEach method does not directly support this method. This article will explain the reasons and explore alternative methods for implementing premature termination in Stream processing systems. Further reading: Java Stream API improvements Understand Stream forEach The forEach method is a terminal operation that performs one operation on each element in the Stream. Its design intention is
PHP: A Key Language for Web Development
Apr 13, 2025 am 12:08 AM
PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7
PHP vs. Python: Understanding the Differences
Apr 11, 2025 am 12:15 AM
PHP and Python each have their own advantages, and the choice should be based on project requirements. 1.PHP is suitable for web development, with simple syntax and high execution efficiency. 2. Python is suitable for data science and machine learning, with concise syntax and rich libraries.
Java Program to Find the Volume of Capsule
Feb 07, 2025 am 11:37 AM
Capsules are three-dimensional geometric figures, composed of a cylinder and a hemisphere at both ends. The volume of the capsule can be calculated by adding the volume of the cylinder and the volume of the hemisphere at both ends. This tutorial will discuss how to calculate the volume of a given capsule in Java using different methods. Capsule volume formula The formula for capsule volume is as follows: Capsule volume = Cylindrical volume Volume Two hemisphere volume in, r: The radius of the hemisphere. h: The height of the cylinder (excluding the hemisphere). Example 1 enter Radius = 5 units Height = 10 units Output Volume = 1570.8 cubic units explain Calculate volume using formula: Volume = π × r2 × h (4
PHP vs. Python: Core Features and Functionality
Apr 13, 2025 am 12:16 AM
PHP and Python each have their own advantages and are suitable for different scenarios. 1.PHP is suitable for web development and provides built-in web servers and rich function libraries. 2. Python is suitable for data science and machine learning, with concise syntax and a powerful standard library. When choosing, it should be decided based on project requirements.
PHP vs. Other Languages: A Comparison
Apr 13, 2025 am 12:19 AM
PHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.
Create the Future: Java Programming for Absolute Beginners
Oct 13, 2024 pm 01:32 PM
Java is a popular programming language that can be learned by both beginners and experienced developers. This tutorial starts with basic concepts and progresses through advanced topics. After installing the Java Development Kit, you can practice programming by creating a simple "Hello, World!" program. After you understand the code, use the command prompt to compile and run the program, and "Hello, World!" will be output on the console. Learning Java starts your programming journey, and as your mastery deepens, you can create more complex applications.
