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2、总结每种单例写法的优、缺点.
    饿汉式单单例
        优点:不用考虑多线程问题,简单易懂,不易出错;执行效率高
        缺点:当单例对象不常用时,比较消耗内存。
    懒汉式单例
        优点:延时加载,不会浪费内存
        缺点:实现时需要考虑并发问题,更复杂
    注册式单例
        优点:便于管理;无需对单例对象做特殊实现处理
        缺点:可能会存在并发问题

3、思考破坏单例模式的方式有哪些?并且归纳总结。
    1.反射
    2.并发
    3.反序列化

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