將枚舉傳遞給Java中的構造函數

Question

我正在學習Java。 我想在我的構造函數中有一個枚舉作為參數。 但是我遇到了一個錯誤（我的枚舉存在於一個單獨的類中，該類是公共的，並命名為AvailabilityState {AVAILABLE，ORDERED，REMOVED}

public class Facultymember extends User {
private  int MAX_GENERALBOOKS = 5;
private  int MAX_AUDIOBOOKS = 2;
private AvailabilityState aStatus;

public Facultymember(int genbook, int audbook,AvailabilityState aStatus ){
        this.MAX_GENERALBOOKS=genbook;
        this.MAX_AUDIOBOOKS=audbook;
                this.aStatus  = aStatus;
    }



@Override
    public String toString() {
        return "Facultymember {" + "MAX_GENERALBOOKS=" + MAX_GENERALBOOKS+ ",  MAX_AUDIOBOOKS =" +  MAX_AUDIOBOOKS  + "AvailabilityState," + aStatus +  '}';
    }

}**

Answer 1

如果需要類型為AvailabilityState的參數，則應提供它，如下所示：

User availableFaculty = new Facultymember(5,2, AvailabilityState.AVAILABLE);
User orderedFaculty = new Facultymember(5,2, AvailabilityState.ORDERED);
User removedFaculty = new Facultymember(5,2, AvailabilityState.REMOVED);

或者，定義另一個具有默認可用性狀態的構造函數：

public Facultymember(int genbook, int audbook) {
    // assuming availability by default
    this(genbook, audbook, AvailabilityState.AVAILABLE);
}