suit.java

java 进阶专用。

// The typesafe enum pattern - page 105
public class Suit {
    private final String name;

    private 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");
}