如何将枚举类型添加到具有普通实例变量的类中

Question

public class Car
{
    public enum User { "user", "computer", "na" };
    private char car;
    private final User user;
    private boolean call;
    public Car(char object, User user, boolean call)
    {
        this.car = car;
        this.user = user;
        this.call = call;
    }
        public User getUser()
        {
        return user;
        }
    public void setUser(User user)
    {
        this.user = user;
    }
}

当我尝试编译时，我得到以下内容:

错误:预期

错误:'，'，'}'，或';'预期

error: '}' expected

Answer 1

禁止使用引号:

public enum User { user, computer, na };

Answer 2

您可以使用:

private enum User { USER, COMPUTER, NA }

另外，为了允许赋值，从user的声明中删除final关键字:

private User user;

创建一个新的Car，你可以使用:

new Car('A', User.COMPUTER, true);

Answer 3

问题是:

中的双引号

public enum User { "user", "computer", "na" };

删除它们:

public enum User { user, computer, na };