如何修复Octaplanner类ConferenceSchedulingConstraintProvider.java中的错误？

Question

Netbeans指向类ConferenceSchedulingConstraintProvider.java int ht方法中的错误：

private Constraint talkPrerequisiteTalks(ConstraintFactory factory) {
        return factory.from(Talk.class)
                .join(Talk`enter code here`.class,
                        containing(Talk::getPrerequisiteTalkSet, Function.identity()),
                        lessThan(talk1 -> talk1.getTimeslot().getStartDateTime(),
                                talk2 -> talk2.getTimeslot().getEndDateTime()))
                .penalizeConfigurable(TALK_PREREQUISITE_TALKS,
                        Talk::combinedDurationInMinutes);
}

Answer 1

您的语言级别可能未设置为至少Java 8。

打开项目的设置并将其设置为Java 8或更高版本。