在类构造函数中使用枚举

Question

我正在为即将到来的考试做一些修订，我对对象构造函数中枚举的使用有点困惑。

public class Country {

    private String name;
    private enum Status {NOTMEMBER, GENERALASSEMBLY, TEMPORARYSC, PERMANENTSC};
    private boolean duesPaid;

    public Country(String name, Status status, boolean duesPaid) {
        this.name = name;
        this.Status = status;
        this.duesPaid = duesPaid;
    }

    public String getName() {
        return name;
    }

    public Status getStatus() {
        return Status;
    }

    public boolean hasPaidDues() {
        return duesPaid;
    }

    public void changeStatus(Status status) {
        this.Status = status;
    }
}

Answer 1

枚举声明必须是公共的，否则调用方无法访问其值：

public enum Status {NOTMEMBER, GENERALASSEMBLY, TEMPORARYSC, PERMANENTSC};
public class Country 
{
    private String name;
    private boolean duesPaid;
    private Status status;
    
    public Country(String name, Status status, boolean duesPaid) {
        this.name = name;
        this.Status = status;
        this.duesPaid = duesPaid;
    }

    // getters + setters left out for brevity
}

如果在类中声明，它必须仍然是公共的，然后可以使用country.status访问，例如country.status.notmember。