Map项目中的实例

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package com.power7000.service.impl.sun.sts;import java.util.concurrent.ConcurrentHashMap;import org.apache.log4j.Logger;public class PowerDataMonthlyMap {    private static Logger logger = Logger.getLogger(PowerDataMonthlyMap.class);    private PowerDataMonthlyMap(){}    private static PowerDataMonthlyMap powerDataMonthlyMap;    public static PowerDataMonthlyMap getInstance()    {        if(powerDataMonthlyMap == null)        {            powerDataMonthlyMap = new PowerDataMonthlyMap();        }        return powerDataMonthlyMap;    }private final ConcurrentHashMap<String, TimeTagCombinedActive> powerDataMonthlymap = new ConcurrentHashMap<String, TimeTagCombinedActive>();    public TimeTagCombinedActive get(String key) {        if (this.checkExist(key)) {            return powerDataMonthlymap.get(key);        }        return null;    }public void remove(String key) {        try {            powerDataMonthlymap.remove(key);        } catch (NullPointerException e) {            logger.error(e);        }    }    public void add(String key, TimeTagCombinedActive timeTagCombinedActive) {        if (key == null || timeTagCombinedActive == null) {            return;        }        try {            powerDataMonthlymap.put(key, timeTagCombinedActive);        } catch (NullPointerException e) {            logger.error(e);        }    }public boolean checkExist(String key) {        try {            return powerDataMonthlymap.containsKey(key);        } catch (NullPointerException e) {            // 写入日志            logger.error(e);            return false;        }    }    /**     * session     * @return     */    public ConcurrentHashMap<String, TimeTagCombinedActive> getSessionMap(){        return powerDataMonthlymap;    }}
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