How to obtain the names of classes that have been loaded by the JVM?

You can obtain the names of the classes loaded by the JVM by using the Java Management Extensions (JMX) API. The specific steps are as follows:

1. Firstly, you need to create a JMX connection to the JVM. This can be achieved using the following code:

import javax.management.MBeanServerConnection;
import javax.management.remote.JMXConnector;
import javax.management.remote.JMXConnectorFactory;
import javax.management.remote.JMXServiceURL;

public class JMXClient {
    public static void main(String[] args) throws Exception {
        JMXServiceURL url = new JMXServiceURL("service:jmx:rmi:///jndi/rmi://localhost:1099/jmxrmi");
        JMXConnector jmxc = JMXConnectorFactory.connect(url, null);
        MBeanServerConnection mbsc = jmxc.getMBeanServerConnection();
        
        // 连接成功后可以进行后续操作
    }
}

1. Then you can use the MBeanServerConnection object to obtain the names of the loaded classes. The specific code is as follows:

import javax.management.ObjectName;

public class JMXClient {
    public static void main(String[] args) throws Exception {
        // 省略创建JMX连接的代码
        
        ObjectName classLoadingMBean = new ObjectName("java.lang:type=ClassLoading");
        int loadedClassCount = (int) mbsc.getAttribute(classLoadingMBean, "LoadedClassCount");

        System.out.println("Loaded class count: " + loadedClassCount);
        
        String[] loadedClassNames = (String[]) mbsc.getAttribute(classLoadingMBean, "LoadedClassNames");
        for(String className : loadedClassNames) {
            System.out.println(className);
        }
        
        jmxc.close();
    }
}

By using the above code, you can retrieve the names of classes loaded in the JVM and print them to the console. It is important to note that you need to enable JMX functionality when starting the JVM, and you can refer to the JVM documentation for specific instructions.