List<ProtocolActualExecutionInfo> protocolActualExecutionInfos = protocolActualExecutionInfoMapper.selectByExample(protocolActualExecutionInfoExample); List<ProtocolDetailInfo> protocolDetailInfos = protocolDetailInfoMapper.selectByExample(protocolDetailInfoExample);根据ProtocolActualExecutionInfo中的dlcgid+dlcgxyid与ProtocolDetailInfo中的dlcgid+dlcgxyid匹配合并成一个list

可以使用Java8的Stream API来实现这个需求，具体代码如下：

List<ProtocolActualExecutionInfo> protocolActualExecutionInfos = protocolActualExecutionInfoMapper.selectByExample(protocolActualExecutionInfoExample);
List<ProtocolDetailInfo> protocolDetailInfos = protocolDetailInfoMapper.selectByExample(protocolDetailInfoExample);

List<ProtocolInfo> protocolInfos = Stream.concat(
        protocolActualExecutionInfos.stream().map(info -> new ProtocolInfo(info.getDlcgid(), info.getDlcgxyid())),
        protocolDetailInfos.stream().map(info -> new ProtocolInfo(info.getDlcgid(), info.getDlcgxyid()))
    )
    .distinct()
    .collect(Collectors.toList());

其中，`ProtocolInfo`是一个简单的POJO类，表示`dlcgid`和`dlcgxyid`的组合：

public class ProtocolInfo {
    private String dlcgid;
    private String dlcgxyid;

    public ProtocolInfo(String dlcgid, String dlcgxyid) {
        this.dlcgid = dlcgid;
        this.dlcgxyid = dlcgxyid;
    }

    // 省略getter和setter方法

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        ProtocolInfo that = (ProtocolInfo) o;
        return Objects.equals(dlcgid, that.dlcgid) &&
                Objects.equals(dlcgxyid, that.dlcgxyid);
    }

    @Override
    public int hashCode() {
        return Objects.hash(dlcgid, dlcgxyid);
    }
}

这里使用了`Stream.concat()`方法将两个Stream合并起来，然后使用`distinct()`方法去重，最后使用`Collectors.toList()`方法将结果收集到一个List中。