枚举类型的数据存入到map中

原文来自 http://fokman.iteye.com/blog/1568905

public enum IdeasCMD {
    RESERVED(0), PING(1), PING_ACK(2), KEY_EXCHANGE(3), KEY_EXCHANGE_ACK(4), CONNECT(5), CONNECT_ACK(6), DISCONNECT(7), KEEP_ALIVE(
            8), KEEP_ALIVE_ACK(9)   ;

    private final int value;

    /**
     * enum lookup map
     */
    private static final Map<Integer, IdeasCMD> lookup = new HashMap<Integer, IdeasCMD>();

    static {
        for (IdeasCMD s : EnumSet.allOf(IdeasCMD.class)) {
            lookup.put(s.getValue(), s);
        }
    }

    IdeasCMD(int value) {
        this.value = value;
    }

    public int getValue() {
        return value;
    }

    public static IdeasCMD lookup(int value) {
        return lookup.get(value);
    }
}