用Java中的类替换枚举结构仍然相关？

我正在阅读2008年由Joshua Bloch撰写的有效 Java,一个提示是用类替换枚举结构.这是从书中显示的例子.

public class Suit {
    private final String name;
    public Suit(String name) { this.name = name; }
    public String toString() { return name; }
    public static final Suit CLUBS = new Suit("clubs");
    public static final Suit DIAMONDS = new Suit("diamonds");
    public static final Suit HEARTS = new Suit("hearts");
    public static final Suit SPADES = new Suit("spades");
}

我的问题是Java现在支持枚举类型,使用上面的方法还是个好主意吗？以下是Java枚举类型的示例.

public enum Day {
    SUNDAY,MONDAY,TUESDAY,WednESDAY,THURSDAY,FRIDAY,SATURDAY 
}

解决方法

“有效的Java”书已经在将枚举引入语言之前写得很好,所以我建议使用枚举功能.幸运的是,Java枚举是非常多才多艺的,所以你可以使用枚举功能来密切关注Joshua的建议：

public enum Day {
    SUNDAY("Sunday",0),MONDAY("Monday",1),TUESDAY("Tuesday",2),WednESDAY("Wednesday",3),THURSDAY("Thursday",4),FRIDAY("Friday",5),SATURDAY("Saturday",6);

    private String name;
    private int ordinal;
    public String getName() { return name; }
    public int getordinal() { return ordinal; }
    public Day(String name,int ordinal) {
        this.name = name;
        this.ordinal = ordinal;
    }
}