Collections 比较Java8中的实例

我有一个目标：

public class MatchEvent implements Serializable {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;


    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;


    private Instant dateReceived;

    public Instant getDateReceived() {
        return dateReceived;
    }


    public void setDateReceived(Instant dateReceived) {
        this.dateReceived = dateReceived;
    }

}

我想按收到日期订购

matchService
            .findAllByDay(today)
                .sorted(Comparator.comparing(MatchEvent::dateReceived))

但这似乎是不可能的，因为我遇到了一个编译错误：

Multiple markers at this line
    - The method comparing(Function<? super T,? extends U>) in the type Comparator is not applicable for the arguments 
     (MatchEvent::dateReceived)
    - The type MatchEvent does not define dateReceived(T) that is applicable here

此行有多个标记
-方法比较（函数在
类MatchEvent
中声明一个名为
getDateReceived（）
的公共方法，如下所示：

public Instant getDateReceived(){
    return dateReceived;
}

Comparator.comparing(MatchEvent::getDateReceived)

然后您可以使用此方法作为方法参考，如下所示：

public Instant getDateReceived(){
    return dateReceived;
}

Comparator.comparing(MatchEvent::getDateReceived)

dateReceived是一个私有字段。您需要一个公共的
getDateReceived（）
方法才能使用方法引用：
Comparator.Comparating（MatchEvent:：getDateReceived）