COJEN Frame Class Library's use guide

COJEN Framework Java Library User Guide Guide Cojen is a powerful Java class library that provides many tools and functions that facilitate developers.This article will provide you with a guide to use the Cojen framework, introducing how to use the class library and functions provided by Cojen in the Java project. 1. Introduce the Cojen framework To use the Cojen framework, you must first introduce it to your Java project.You can achieve the following dependencies by adding the following dependencies by adding the following dependencies in the construction management file (such as Maven's pom.xml file): <dependency> <groupId>org.cojen</groupId> <artifactId>cojen</artifactId> <version>3.0.0</version> </dependency> After successfully introducing the Cojen framework, you will be able to start using the library and functions in it. 2. Use Cojen to generate the Java class Cojen provides a powerful classifier that can be used to dynamically generate the Java class.The following is a simple example, demonstrating how to use Cojen to generate a simple Java class: import org.cojen.util.ClassMaker; public class Main { public static void main(String[] args) throws Exception { // Create a new classifier ClassMaker cm = ClassMaker.begin(null); // Set the name of the generating class and access modification symbol cm.setClassName("GeneratedClass"); cm.setModifiers(ClassMaker.ACC_PUBLIC); // Add a public non -ginseng constructor function cm.addDefaultConstructor(); // Add a public method cm.addMethod(ClassMaker.ACC_PUBLIC, "printHello", null, null, "{ System.out.println(\"Hello, Cojen!\"); }"); // Generate and load this class Class<?> generatedClass = cm.finish(); // Create an instance of generating class and call the method Object instance = generatedClass.getDeclaredConstructor().newInstance(); generatedClass.getDeclaredMethod("printHello").invoke(instance); } } After executing the above code, you will see the output of "Hello, Cojen!". 3. Use Cojen to debug java code Cojen also provides some powerful debugging tools for reviewing and editing Java code during runtime.The following is an example that demonstrates the local variable value of how to use the cojen debugging tool printing method: import org.cojen.util.ClassInjector; import org.cojen.util.ConstantPool; import org.cojen.util.Disassembler; public class Main { public static void main(String[] args) throws Exception { // Load the byte code of the class to be debugged byte[] classBytes = ClassInjector.getClassBytes(Main.class); // Create a constant pool ConstantPool pool = new ConstantPool(); // Anti -foreign exchange bytecode and output local variable value Disassembler disassembler = new Disassembler(pool); disassembler.setEnableLocalVariableDebugging(true); disassembler.setOutputClassName(Main.class.getName()); disassembler.disassemble(classBytes, 0, classBytes.length, System.out); } } After the above code is executed, you will see the local variable information contained in the method containing the method in the counter assembly output. Summarize This article introduces some common usage and functions of using the Cojen framework, hoping to help you in the development of the Java project.By introducing the Cojen framework and using the class library and tools, you can more conveniently generate the Java class, debug Java code, etc.After mastering the Cojen framework quickly, you will be able to carry out Java development more efficiently.