java - 组合类中的属性

Question

我有以下自定义类

class rollingD {
 private String settDate;
    private String publishingPeriodCommencingTime;
    private String fuelTypeGeneration;

    public String getSettDate() {
        return settDate;
    }

    public void setSettDate(String settDate) {
        this.settDate = settDate;
    }

    public String getPublishingPeriodCommencingTime() {
        return publishingPeriodCommencingTime;
    }

    public void setPublishingPeriodCommencingTime(String publishingPeriodCommencingTime) {
        this.publishingPeriodCommencingTime = publishingPeriodCommencingTime ;
    }

    public String getFuelTypeGeneration() {
        return fuelTypeGeneration;
    }

    public void setFuelTypeGeneration(String fuelTypeGeneration) {
        this.fuelTypeGeneration = fuelTypeGeneration;
    }

    @Override
 public String toString() {
        return String.format("%s,%s,%s",
                             settDate,
                             publishingPeriodCommencingTime,
                             fuelTypeGeneration);



 }} 

这些项目添加到我的数组列表中，如下所示

ArrayList<rollingD> aList = new ArrayList<>();

属性

settDate
and 
publishingPeriodCommencingTime

是独立的实体

01/04/2020
and 
21:34:26

我想做的是在我的类中，我想在将属性添加到数组列表之前组合它们

所以我最终会得到

01/04/2020 21:34:26  

作为单个属性

因此，我的数组列表中只有 2 个属性，然后我可以对其进行排序等

有人可以提供帮助吗？

我尝试过之后流式传输 map 并合并流，但我意识到这不是一个理想的解决方案，因为我需要进一步使用数组列表，理想情况下使用日期时间戳和值作为我唯一的两个项目

这是解析API的代码

      while(parser.hasNext()) {
    XMLEvent event = parser.nextEvent();

    switch(event.getEventType()) {

    case XMLStreamConstants.START_ELEMENT:
    StartElement startElement = event.asStartElement();
    String qName = startElement.getName().getLocalPart();

    if (qName.equalsIgnoreCase("settDate")) {
       rD = new rollingD(null,null,null);
    bMarks = true;


    } else if (qName.equalsIgnoreCase("publishingPeriodCommencingTime")) {
    bLastName = true;

    } else if (qName.equalsIgnoreCase("fuelTypeGeneration")) {
    bNickName = true;
    aList.add(rD);

    }

    break;

    case XMLStreamConstants.CHARACTERS:
    Characters characters = event.asCharacters();
    if(bMarks) {

  //  System.out.println("settDate: " + characters.getData());
    rD.getTimeStamp(characters.getData(),null,null);
    bMarks = false;

    }
    if(bLastName) {
  //  System.out.println("publishingPeriodCommencingTime: " + characters.getData());
    rD.getTimeStamp(null,characters.getData(),null);

    bLastName = false;
    }
    if(bNickName) {
   // System.out.println("fuelTypeGeneration: " + characters.getData());
    rD.getTimeStamp(null,null,characters.getData());
    bNickName = false;
    }



    break;

    case XMLStreamConstants.END_ELEMENT:
    EndElement endElement = event.asEndElement();





//List<String> namesList = aList.stream()
//.map(x->x.getSettDate()+" "+ x.getPublishingPeriodCommencingTime()+","+ x.getFuelTypeGeneration())
//.collect(Collectors.toList());

//Collections.sort(namesList);
//
//for (String name : namesList) {
//System.out.println(name);
//}








    if(endElement.getName().getLocalPart().equalsIgnoreCase("item")) {

    System.out.println();
    }
    break;
    } 
    }  

Answer 1

按如下方式进行:

class RollingD {
    private String settDate;
    private String publishingPeriodCommencingTime;
    private String fuelTypeGeneration;
    private String timeStamp;

    public RollingD(String settDate, String publishingPeriodCommencingTime, String fuelTypeGeneration) {
        this.settDate = settDate;
        this.publishingPeriodCommencingTime = publishingPeriodCommencingTime;
        this.fuelTypeGeneration = fuelTypeGeneration;
        timeStamp = settDate != null && publishingPeriodCommencingTime != null && !settDate.isEmpty()
                && !publishingPeriodCommencingTime.isEmpty() ? settDate + " " + publishingPeriodCommencingTime : "";
    }

    public String getTimeStamp() {
        return settDate != null && publishingPeriodCommencingTime != null && !settDate.isEmpty()
                && !publishingPeriodCommencingTime.isEmpty() ? settDate + " " + publishingPeriodCommencingTime : "";

    }

    // ..Do not create any setter for timeStamp
    // ..Other getters and setters

    @Override
    public String toString() {
        return "RollingD [settDate=" + settDate + ", publishingPeriodCommencingTime=" + publishingPeriodCommencingTime
                + ", fuelTypeGeneration=" + fuelTypeGeneration + ", timeStamp=" + timeStamp + "]";
    }
}

演示:

public class Main {
    public static void main(String[] args) {
        RollingD rd1 = new RollingD("", "", "G");
        System.out.println(rd1);
        RollingD rd2 = new RollingD("01/04/2020", "", "G");
        System.out.println(rd2);
        RollingD rd3 = new RollingD("", "21:34:26", "G");
        System.out.println(rd3);
        RollingD rd4 = new RollingD("01/04/2020", "21:34:26", "G");
        System.out.println(rd4);
    }
}

输出:

RollingD [settDate=, publishingPeriodCommencingTime=, fuelTypeGeneration=G, timeStamp=]
RollingD [settDate=01/04/2020, publishingPeriodCommencingTime=, fuelTypeGeneration=G, timeStamp=]
RollingD [settDate=, publishingPeriodCommencingTime=21:34:26, fuelTypeGeneration=G, timeStamp=]
RollingD [settDate=01/04/2020, publishingPeriodCommencingTime=21:34:26, fuelTypeGeneration=G, timeStamp=01/04/2020 21:34:26]