java - 将 ArrayList 对象引用到其他 ArrayList 的对象

Question

我有 3 个不同的类(class)；参赛者、项目和结果。

public class Contestant {

public static ArrayList<Contestant> allContestants = new ArrayList<>();

private int contestantId;
private String firstName;
private String lastName;

public Contestant (int contestantId, String firstName, String lastName) {
    this.contestantId = contestantId;
    this.firstName = firstName;
    this.lastName = lastName;
}

---

public class Event {

public static ArrayList<Event> allEvents = new ArrayList<>();

private String eventName;

public Event (String eventName) {
    this.eventName = eventName;
}

---

public class Result {

public static ArrayList<Result> allResults = new ArrayList<>();

private double result;
private int attemptNumber;

public Result (double result, int attemptNumber) {
    this.result = result;
    this.attemptNumber = attemptNumber:
}

---

这些类具有不同的方法来向每个 ArrayList 添加新的 Contestant 对象、新的 Event 对象和新的 Result 对象。每个参赛者可以参加多个 Activity ，并且对于每个 Activity ，他们可以创造多个结果。

我想要实现的是让每个 Result 对象引用 Contestant ArrayList 对象以及 Event ArrayList 对象 - 如何最好地链接它们？

Answer 1

你的事件类应该是这样的，你可以使用Hashmap代替数组列表。

public class Event {
//In this you can have contestantId as key and Event as value
public static Map<String, Event> allEvents = new HashMap<String, Event>();

private String eventName;

public Event (String eventName) {
    this.eventName = eventName;
}

你的结果类应该是这样的:

public class Result {
//In this you can have eventName as key and Result as value
public static Map<String, Result> allResults = new HashMap<String, Result>();

private double result;
private int attemptNumber;

public Result (double result, int attemptNumber) {
    this.result = result;
    this.attemptNumber = attemptNumber:
}