Question

我有3个不同的班级;参赛者，赛事和结果。

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:
}

这些类有不同的方法可以向每个ArrayList添加新的Contestant对象，新的Event对象和新的Result对象。每个参赛者都可以参加多个活动，每个活动都可以创造多个结果。

我想要实现的是每个Result对象引用一个Contestant ArrayList对象以及一个Event ArrayList对象 - 我该如何最好地链接它们？

Answer 1

您的事件类应该是这样的，而不是数组列表，您可以使用Hashmap。

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:
}

将ArrayList对象引用到其他ArrayLists的对象

1 个答案: