写出getChildren()方法程序

以下是使用 ZooKeeper Java API 的 `getChildren()` 方法获取指定节点的子节点名称列表的示例程序：

import org.apache.zookeeper.*;
import java.io.IOException;
import java.util.List;

public class ZooKeeperGetChildrenExample implements Watcher {

    private static final String ZOOKEEPER_ADDRESS = "localhost:2181";
    private static final int SESSION_TIMEOUT = 3000;

    private ZooKeeper zooKeeper;

    public void connect() throws IOException {
        zooKeeper = new ZooKeeper(ZOOKEEPER_ADDRESS, SESSION_TIMEOUT, this);
    }

    public void close() throws InterruptedException {
        zooKeeper.close();
    }

    public List<String> getChildren(String path) throws KeeperException, InterruptedException {
        return zooKeeper.getChildren(path, false);
    }

    @Override
    public void process(WatchedEvent event) {
        // Handle any watched events here
    }

    public static void main(String[] args) throws IOException, KeeperException, InterruptedException {
        ZooKeeperGetChildrenExample example = new ZooKeeperGetChildrenExample();
        example.connect();

        // Get children of the /test node
        List<String> children = example.getChildren("/test");
        System.out.println("Children of /test node: " + children);

        example.close();
    }
}

在这个示例程序中，我们首先创建了一个 `ZooKeeper` 对象，并连接到 ZooKeeper 服务器。然后，我们调用 `getChildren()` 方法来获取 `/test` 节点的所有子节点名称。最后，我们关闭了 ZooKeeper 连接。

需要注意的是，在实际应用程序中，您需要根据需要处理 `KeeperException` 或 `InterruptedException` 异常，并编写适当的重试和回退机制来处理这些异常情况。