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;
}
}