JAVA多线程并发操作全局变量

package com.message.application;

import com.sun.org.apache.xalan.internal.xsltc.runtime.Hashtable;

public class ApplicationValue {
	
	private static Hashtable licenceKeyHashTable;
	
	static {
		System.out.println("ApplicationValue static代码块");
		licenceKeyHashTable = new Hashtable();
		licenceKeyHashTable.put("A", 1000000);
	}
	
	public static long getLicenKeyValue() {
		long value = Long.parseLong(licenceKeyHashTable.get("A").toString());
		return value;
	}
	
	public static void setLicenKeyValue(long val) {
		licenceKeyHashTable.put("A", val);
	}
	
}

package com.message.quartz.schedule;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.message.application.ApplicationValue;
import com.message.application.MessageContext;
import com.message.services.interfaces.IMessageSV;

public class MessageSchedule {
	private static Log log = LogFactory.getLog(MessageSchedule.class);
	
	public void send() throws Exception {
		log.info("=========================START=========================");
		//log.info(arg0);
		long currentVal = ApplicationValue.getLicenKeyValue();
		log.info("当前线程名称："+Thread.currentThread().getName()+":"+currentVal);
		if(getModNum() == 1) {
			log.info("名称为1的线程sleep3秒");
			Thread.currentThread().sleep(3000);
		}
		ApplicationValue.setLicenKeyValue(--currentVal);
		log.info("=========================END=========================");
	}
	
	public void send2() throws Exception {
		log.info("=========================START=========================");
		int modNum = getModNum();
		IMessageSV sv = (IMessageSV) MessageContext.getBean("IMessageSV");
		sv.dealMessages(modNum);
		log.info("=========================END=========================");
	}

	public static int getModNum() {
		String tName = Thread.currentThread().getName();
		String modNum = tName.substring(tName.length() - 1, tName.length());
		log.info(tName + "-----modNum:" + modNum);
		return Integer.parseInt(modNum);
	}

}