The technical principles of the "Iron can adjust the behavior 'framework' framework in the Java class library

The technical principles of the "iron -adjustable behavior" framework in the Java class library Summary: During the development of Java, behaviors that need to be dynamically adjusted according to different scenarios are often encountered.To solve this problem, the Java library provides a framework called "Iron adjustment behavior".This article will explore the technical principles of the framework and provide some practical cases and Java code examples. 1 Introduction Java is an object -oriented programming language, and its class library provides rich functions and tools.Sometimes, during the development process, we need to dynamically adjust the category behavior according to different situations or needs in order to better meet business needs.The demand for dynamic adjustments is the problem that the "iron adjustment behavior" framework is committed to solving. 2. Technical principles The technical principles of the "iron can adjust behavior" can be summarized as the following points: 2.1 interface and abstract class In Java, we can define some public behavior and interfaces through interfaces and abstract classes to achieve these behaviors in different categories.The interface and abstract class provides the basis for the framework of "Iron Adjustment Behavior". 2.2 reflection The "iron can adjust behavior" framework can dynamically obtain the class information, including the method, field, etc. by using the reflection mechanism of Java.This provides the flexibility that can adjust the behavior. 2.3 Configuration file The framework of "Iron Adjustment" can use the configuration file to specify different types of behaviors.Through the configuration file, you can specify the class, the method of calling, and related parameters that need to be loaded.In this way, we can define different class behaviors in different configuration files as needed. 3. Case Inquiry In order to better understand the technical principles of the "iron -adjustable behavior" framework, we will explain it through a specific case. Assuming that there is an e -commerce platform, we need to decide the preferential methods given according to the consumer behavior of different users.Through the "Iron adjustment behavior" framework, we can dynamically adjust the calculation method of discounts based on the user's consumption amount and purchase frequency. First, we define an abstract class DiscountcalCulator, which includes an abstract method CALCULATE, which is used to calculate the preferential amount.We then define two specific subclasses, which are FIXEDDISCOUNTCALCULATOR and PERCENTAGEDISCOUNTCULATOR, respectively, respectively, respectively, respectively. abstract class DiscountCalculator { public abstract double calculate(double amount); } class FixedDiscountCalculator extends DiscountCalculator { private double discountAmount; public FixedDiscountCalculator(double discountAmount) { this.discountAmount = discountAmount; } @Override public double calculate(double amount) { return amount - discountAmount; } } class PercentageDiscountCalculator extends DiscountCalculator { private double discountPercentage; public PercentageDiscountCalculator(double discountPercentage) { this.discountPercentage = discountPercentage; } @Override public double calculate(double amount) { return amount - amount * discountPercentage; } } Next, we can use the configuration file to specify the preferential calculation method of different users.Suppose we have a configuration file Config.properties, the content is as follows: plaintext user1=com.example.FixedDiscountCalculator,10 user2=com.example.PercentageDiscountCalculator,0.1 We can then write a discountCalCulatorFactory class to dynamically generate the corresponding discountCalCulator instance according to the information in the configuration file. public class DiscountCalculatorFactory { public static DiscountCalculator create(String className, double arg) { try { Class<?> calculatorClass = Class.forName(className); Constructor<?> constructor = calculatorClass.getConstructor(double.class); return (DiscountCalculator) constructor.newInstance(arg); } catch (ClassNotFoundException | NoSuchMethodException | IllegalAccessException | InstantiationException | InvocationTargetException e) { e.printStackTrace(); } return null; } } Finally, we can write a test class that uses DiscountCalCulatorFactory to dynamically generate a discount calculator based on the configuration file and calculate the discount amount of different users. import java.io.FileInputStream; import java.io.IOException; import java.lang.reflect.Constructor; import java.lang.reflect.InvocationTargetException; import java.util.Properties; public class DiscountCalculatorTest { public static void main(String[] args) throws IOException { Properties properties = new Properties(); FileInputStream fis = new FileInputStream("config.properties"); properties.load(fis); String user1Calculator = properties.getProperty("user1"); String[] user1CalcArr = user1Calculator.split(","); String user1ClassName = user1CalcArr[0]; double user1Arg = Double.parseDouble(user1CalcArr[1]); DiscountCalculator user1DiscountCalculator = DiscountCalculatorFactory.create(user1ClassName, user1Arg); System.out.println("User1 discount: " + user1DiscountCalculator.calculate(100.0)); String user2Calculator = properties.getProperty("user2"); String[] user2CalcArr = user2Calculator.split(","); String user2ClassName = user2CalcArr[0]; double user2Arg = Double.parseDouble(user2CalcArr[1]); DiscountCalculator user2DiscountCalculator = DiscountCalculatorFactory.create(user2ClassName, user2Arg); System.out.println("User2 discount: " + user2DiscountCalculator.calculate(100.0)); } } In the above code, we use the Properties class to load the configuration file and dynamically generate the corresponding preferential calculator instance based on the information in the configuration file.Then, we call the discount of different users by calling the Calculating method and output the results. Through the above cases, we can see the technical principles of the "Iron Adjustable Behavior" framework, that is, dynamically adjust the behavior of the class by reflecting and configured files to meet the scenes of different needs. in conclusion: The "iron adjustment behavior" framework plays an important role in the development of Java.Through the flexible use of technical means such as interface, abstract, reflection, and configuration files, the behavior of class can be dynamically adjusted during runtime to meet different business needs.This is a very important and practical technology for Java developers.