test

package cn.itcast.bankqueue;import java.util.ArrayList;import java.util.List;public class NumberManager {private int lastNumber = 0;private List queueNumbers = new ArrayList();public synchronized Integer generateNewNumber(){queueNumbers.add(++lastNumber);return lastNumber;}public synchronized Integer fetchNumber(){if(queueNumbers.size()>0){return (Integer)queueNumbers.remove(0);}else{return null;}}}