如何使用rosjava获取所有正在运行的ros节点列表？

<dependency>
    <groupId>org.ros.rosjava_core</groupId>
    <artifactId>rosjava</artifactId>
    <version>0.3.7</version>
</dependency>

import org.ros.node.DefaultNodeMainExecutor;
import org.ros.node.NodeConfiguration;
import org.ros.node.NodeMainExecutor;
import org.ros.node.AbstractNodeMain;

public class MyNode extends AbstractNodeMain {
    @Override
    public void onStart(ConnectedNode connectedNode) {
        // 在这里编写节点启动后的逻辑
    }

    @Override
    public GraphName getDefaultNodeName() {
        return GraphName.of("my_node");
    }
    
    public static void main(String[] args) {
        NodeMainExecutor nodeMainExecutor = DefaultNodeMainExecutor.newDefault();
        MyNode myNode = new MyNode();
        NodeConfiguration nodeConfiguration = NodeConfiguration.newPublic("localhost");
        nodeMainExecutor.execute(myNode, nodeConfiguration);
    }
}

URI masterUri = nodeMainExecutor.getMasterUri();

import org.ros.master.client.MasterStateClient;
import org.ros.master.client.TopicType;

MasterStateClient masterStateClient = new MasterStateClient(masterUri);
List<TopicType> topicTypes = masterStateClient.getTopicTypes();
for (TopicType topicType : topicTypes) {
    System.out.println("Node: " + topicType.getNodeName() + ", Topic: " + topicType.getTopicName());
}