如何为枚举创建 getter 和 setter

Question

public enum EventTypeName
{
    MAIN_EVENT(new MainEvent()),
    MAIN_ADJUSTMENT_EVENT(new MainAdjustmentEvent()),
    CUSTOMER_EVENT(new CustomerEvent()),
     EventType eventType;

    private EventTypeName(EventType eventType)
    {
        this.eventType = eventType;
    }

    public EventType getEventType()
    {
        return eventType;
    }
}

I need to make getters and getters and setters for all new events to be declared in enum.

Answer 1

Apparently you want to instante a new subclass of EventType for each of the various enum objects, when the getEventType method is called.

In this situation, do not name your method with get prefix. In commonly used JavaBeans conventions, such a prefix indicates an accessory method to retrieve a property of the object. Given your intentions, a prefix of new or make may be more appropriate.

public enum EventTypeName
{
    MAIN_EVENT , MAIN_ADJUSTMENT_EVENT , CUSTOMER_EVENT ;

    // Assumes MainEvent, MainAdjustmentEvent, and CustomerEvent are all subclasses of EventType. 
    public EventType makeEventType()
    {
        if ( this.equals( MAIN_EVENT ) ) { return new MainEvent() ; }
        if ( this.equals( MAIN_ADJUSTMENT_EVENT ) ) { return new MainAdjustmentEvent() ; }
        if ( this.equals( CUSTOMER_EVENT ) ) { return new CustomerEvent() ; }
    }
}

Usage.

EventType eventType = EventTypeName.MAIN_ADJUSTMENT_EVENT.makeEventType() ;

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I get an unsettled feeling from looking at your code, suspecting a poor or flawed design. Likely from a misunderstanding of enums in Java. An enum should not be considered as a collection. You cannot define additional enum objects at runtime; they are defined at compile-time.