如何在数据流/波束中将PCollection<List<String>>转换为PCollection<String>

import org.apache.beam.sdk.Pipeline;
import org.apache.beam.sdk.transforms.Flatten;
import org.apache.beam.sdk.values.PCollection;

public class DataFlowTransformation {
    public static void main(String[] args) {
        // 创建Pipeline对象
        Pipeline pipeline = Pipeline.create();

        // 创建PCollection<List<String>>作为输入数据流
        PCollection<List<String>> inputCollection = ...; // 输入数据流的创建方式根据实际情况进行定义

        // 将PCollection<List<String>>转换为PCollection<String>
        PCollection<String> outputCollection = inputCollection.apply(Flatten.iterables());

        // 对PCollection<String>进行后续的处理操作

        // 运行Pipeline
        pipeline.run();
    }
}