search
HomeJavajavaTutorialDetailed explanation of the principles and usage of the adapter pattern in Java classic design patterns

This article mainly introduces the adapter pattern of Java's classic design pattern, briefly explains the concept and principle of the adapter pattern, and analyzes the usage and related precautions of the java adapter pattern in the form of examples. Friends in need can refer to it

The example in this article describes the adapter pattern of Java's classic design pattern. Share it with everyone for your reference, the details are as follows:

Adapter pattern is to adapt the interface of a class to what the user expects, so that some classes that cannot work together due to incompatible interfaces Classes work together to achieve the functionality expected by users.

Advantages of the adapter mode:

1. Through the adapter, the client can call a unified interface, the operation is simple and direct, and the code logic is compact, Easy to use.
2. Code reuse, the adapter mode solves the problem of different environmental requirements and achieves code reuse through adaptation.
3. Decouple the target class and the adapter class, and reuse the current class by creating a new adapter class. There is no need to repeatedly modify the original code to implement the opening and closing principle.

There are two types of adapter patterns

1. Object adapter pattern: In this adapter pattern, the adapter holds an object of the class it wraps. Example. In this case, the adapter calls the physics entity of the wrapped object.
2. Class adapter mode: In this adapter mode, the adapter inherits from the implemented class (generally multiple inheritance).

Sample code:


##

/**
* @description:
* 原有的接口功能,比如是给电动车充电功能
*/
public interface FirstBaseIf {
void charging();//充电
}
/**
* 要实现的操作功能
* @description:
*/
public class NewFunction {
public void powerWithTwo(){
System.out.println(“新功能:给电动汽车也可以充电啦”);
}
}
/**
*新建适配器类,来实现对原有接口FirstBaseIf的操作使用
* @description:
*/
public class FunctionAdapter implements FirstBaseIf {
private NewFunction plug;
public FunctionAdapter(NewFunction plug){
this.plug=plug;
}
@Override
public void charging() {//重写原有接口中的方法,从而实现接口转化
System.out.println(“通过适配器转化”);
plug.powerWithTwo();
}
}
//——–测试代码——————-
public class Test {
private FirstBaseIf plug;
public Test(FirstBaseIf plug) {
  this.plug = plug;
}
public static void main(String[] args) {
  NewFunction two = new NewFunction();
  FirstBaseIf three = new FunctionAdapter(two);//这里就是通过适配器实现转换
  Test note = new Test(three);
  note.charge();
}
public void charge() {
  plug.charging();//使用原有接口中的功能
}
}

Run result:

Applicable scenarios:

In a Java program, if there is an abstract class or interface, all abstract methods must be rewritten.

So, if there are too many abstract methods defined in an interface, and many abstract methods in the subclass are not needed, you should design an adapter. In Android development through the Java language, the adapter pattern is often used.

The above is the detailed content of Detailed explanation of the principles and usage of the adapter pattern in Java classic design patterns. For more information, please follow other related articles on the PHP Chinese website!

Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
How does the JVM manage garbage collection across different platforms?How does the JVM manage garbage collection across different platforms?Apr 28, 2025 am 12:23 AM

JVMmanagesgarbagecollectionacrossplatformseffectivelybyusingagenerationalapproachandadaptingtoOSandhardwaredifferences.ItemploysvariouscollectorslikeSerial,Parallel,CMS,andG1,eachsuitedfordifferentscenarios.Performancecanbetunedwithflagslike-XX:NewRa

Why can Java code run on different operating systems without modification?Why can Java code run on different operating systems without modification?Apr 28, 2025 am 12:14 AM

Java code can run on different operating systems without modification, because Java's "write once, run everywhere" philosophy is implemented by Java virtual machine (JVM). As the intermediary between the compiled Java bytecode and the operating system, the JVM translates the bytecode into specific machine instructions to ensure that the program can run independently on any platform with JVM installed.

Describe the process of compiling and executing a Java program, highlighting platform independence.Describe the process of compiling and executing a Java program, highlighting platform independence.Apr 28, 2025 am 12:08 AM

The compilation and execution of Java programs achieve platform independence through bytecode and JVM. 1) Write Java source code and compile it into bytecode. 2) Use JVM to execute bytecode on any platform to ensure the code runs across platforms.

How does the underlying hardware architecture affect Java's performance?How does the underlying hardware architecture affect Java's performance?Apr 28, 2025 am 12:05 AM

Java performance is closely related to hardware architecture, and understanding this relationship can significantly improve programming capabilities. 1) The JVM converts Java bytecode into machine instructions through JIT compilation, which is affected by the CPU architecture. 2) Memory management and garbage collection are affected by RAM and memory bus speed. 3) Cache and branch prediction optimize Java code execution. 4) Multi-threading and parallel processing improve performance on multi-core systems.

Explain why native libraries can break Java's platform independence.Explain why native libraries can break Java's platform independence.Apr 28, 2025 am 12:02 AM

Using native libraries will destroy Java's platform independence, because these libraries need to be compiled separately for each operating system. 1) The native library interacts with Java through JNI, providing functions that cannot be directly implemented by Java. 2) Using native libraries increases project complexity and requires managing library files for different platforms. 3) Although native libraries can improve performance, they should be used with caution and conducted cross-platform testing.

How does the JVM handle differences in operating system APIs?How does the JVM handle differences in operating system APIs?Apr 27, 2025 am 12:18 AM

JVM handles operating system API differences through JavaNativeInterface (JNI) and Java standard library: 1. JNI allows Java code to call local code and directly interact with the operating system API. 2. The Java standard library provides a unified API, which is internally mapped to different operating system APIs to ensure that the code runs across platforms.

How does the modularity introduced in Java 9 impact platform independence?How does the modularity introduced in Java 9 impact platform independence?Apr 27, 2025 am 12:15 AM

modularitydoesnotdirectlyaffectJava'splatformindependence.Java'splatformindependenceismaintainedbytheJVM,butmodularityinfluencesapplicationstructureandmanagement,indirectlyimpactingplatformindependence.1)Deploymentanddistributionbecomemoreefficientwi

What is bytecode, and how does it relate to Java's platform independence?What is bytecode, and how does it relate to Java's platform independence?Apr 27, 2025 am 12:06 AM

BytecodeinJavaistheintermediaterepresentationthatenablesplatformindependence.1)Javacodeiscompiledintobytecodestoredin.classfiles.2)TheJVMinterpretsorcompilesthisbytecodeintomachinecodeatruntime,allowingthesamebytecodetorunonanydevicewithaJVM,thusfulf

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

PhpStorm Mac version

PhpStorm Mac version

The latest (2018.2.1) professional PHP integrated development tool

SecLists

SecLists

SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

SublimeText3 English version

SublimeText3 English version

Recommended: Win version, supports code prompts!