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java中通过位运算实现多个状态的判断

通过 <<  |  & ~ 位运算,实现同时拥有多个状态

 

通过 << 定义数据的状态

public interface LogConstants {    /**     * 消耗标记     */    short COST_ASSET = 1 << 0;    short COST_GOLD = 1 << 1;    short COST_BINDGOLD = 1 << 2;    short COST_SOPH = 1 << 3;    short COST_STRSOUL = 1 << 4;    short COST_REFSOUL = 1 << 5;    short COST_SOULSTONE = 1 << 6;    short COST_AAMHID = 1 << 7;    short COST_REALM = 1 << 8;}

 

通过 |= 加入多个状态

short mark = 0;        int costSoph = channel.getSoph();        if (costSoph > 0) {            mark |= LogConstants.COST_SOPH;        }        if (costGold > 0) {            mark |= LogConstants.COST_GOLD;        }

 

通过 (m & LogConstants.COST_ASSET) > 0 判断是否拥有该状态

通过 m = (short) (m & ~LogConstants.COST_ASSET);扣除该状态

public void addCostLog(LogEvent event, Player player, short mark, int... args) {short m = mark;        for (int i : args) {            if ((m & LogConstants.COST_ASSET) > 0) {                m = (short) (m & ~LogConstants.COST_ASSET);                cost.setAsset(i);            } else if ((m & LogConstants.COST_GOLD) > 0) {                m = (short) (m & ~LogConstants.COST_GOLD);                cost.setGold(i);            } else if ((m & LogConstants.COST_BINDGOLD) > 0) {                m = (short) (m & ~LogConstants.COST_BINDGOLD);                cost.setBindGold(i);            } else if ((m & LogConstants.COST_SOPH) > 0) {                m = (short) (m & ~LogConstants.COST_SOPH);                cost.setSoph(i);            } else if ((m & LogConstants.COST_STRSOUL) > 0) {                m = (short) (m & ~LogConstants.COST_STRSOUL);                cost.setStrSoul(i);            } else if ((m & LogConstants.COST_REFSOUL) > 0) {                m = (short) (m & ~LogConstants.COST_REFSOUL);                cost.setRefSoul(i);            } else if ((m & LogConstants.COST_SOULSTONE) > 0) {                m = (short) (m & ~LogConstants.COST_SOULSTONE);                cost.setSoulStone(i);            } else if ((m & LogConstants.COST_AAMHID) > 0) {                m = (short) (m & ~LogConstants.COST_AAMHID);                cost.setAamhid(i);            } else if ((m & LogConstants.COST_REALM) > 0) {                m = (short) (m & ~LogConstants.COST_REALM);                cost.setRealm(i);            }        }    }

 

java中通过位运算实现多个状态的判断