This class can meet the basic requirements, but if we put a class like this without thread safety protection into a multi-threaded environment, there will definitely be problems. How to solve them? The first thing we think of is adding the synchronized keyword to the getInstance method, as follows:
清朝末年，地处南方，本为鱼米之乡的苍河一带连年涝灾，饥荒不断，饿死了不少人，苍河边封闭而古老的两个镇子——桑镇和榆镇也开始动荡不安。
该剧以抗日战争时期关中男人为了保卫大西北东渡黄河，以血肉之躯打击日军于中条山的历史为背景，讲述了王、谢两家之间恩怨情仇故事。一九三八年，日军进攻中条山，企图占领风陵渡,直取潼关。为保卫大西北、保卫西安，陕军三万关中男儿东渡黄河、浴血奋战，以血肉之躯阻敌于中条山下。西安民众群情振奋、踊跃支前，战时服务团运输护卫五队队长、西安运输业协会会长王天年之子王长安，国民革命军三十八军副团长、西安工商业联合会会长谢富奎之子谢大龙，秦腔名旦金月华，西京日报记者谢绵绵，西安警察局反奸处长张华山等人，以国家民族兴亡为重任，凝聚民族精神，尽释前嫌，同仇敌忾，齐心协力开辟了一条打不垮、炸不断的钢铁补给线。日军为实现战略目的，派特工潜入西安，妄图破坏后方补给线，将抗战将士家属组成的支前慰问团诱骗，绑架到中条山，以瓦解陕军将士的抗战意志。王长安、谢大龙、王天年、谢富奎、张华山等一批关中汉子为保护慰问团的安全，与日军展开了生死较量。夕阳下，黄河边，脱离险境的女人们默默地为战死的关中男人祈祷。
伯明翰警察迪·拉希塔·雷（DiRachitaRay）接手了一个迫使她终身面临个人冲突的案件。
Red Net Time, April 22 (Reporter Hu Yi and Correspondent Zhao Cheng) On the evening of April 19, Super Net Comprehensive "I Am a Singer" ushered in the second knockout round. Eight singers and songwriters all brought the second original song on this stage. In the face of high-pressure and high-intensity programs, Wang Sulong, a powerful singer-songwriter, brought a self-described original song "Odd" in this issue after bringing a "Seed" of "Sing to Everyone" in the previous period.
《辛普森一家》（The Simpsons）是美国福克斯广播公司的一部动画情景喜剧，作为美国历史上最长寿的情景喜剧及动画节目，《辛普森一家》对流行文化产生了极大的影响，也赢取了大量的奖项，更是被《时代》周刊等权威刊物评为90年代最优秀的情景喜剧。
张一一是一名在校大学生，身材健硕，性格憨厚，从小向往军营。王哆啦是一名刚毕业的大学生，头脑灵活，油头油脑。两人在火箭军某导弹旅相遇、相识并共同成长，完成了从地方青年到一名合格军人的转变。这期间也发生了许多令人啼笑皆非的故事。
It is stipulated that 12 in a dozen is a decimal system.
在击败了拥有不死之身的大反派汪达尔·萨维奇，以及与其勾结的腐败的时间之主后，新的危机浮出水面。内特·海伍德博士(尼克·扎诺饰)——一个标新立异却魅力十足的历史学家——卷入一场惊人的行动——传奇们在时间线上失散了。
Under centos6.5, the kernel needs to be upgraded to 3.1. The pit I encountered was that although the upgrade was successful, when I started, I was prompted "CPU has been banned" and it was not filled up according to various methods said on the Internet. It was bitter. Probably with my CPU
政府宣布元旦特赦，“迷途中年”周胜龙亦是其中一个受惠囚犯，这已经是龙第五次出狱。龙自十八岁开始犯事先后因伤人、恐吓、勒索、主持赌场及收取保护费而入狱接受管训，可算是前科累累。龙出身良好家庭，十八岁那年因为一时冲动，激于义愤替好友出头打伤同学，被送往管训。
可是，眼下不能不想了。
他为这个明艳、热情的女客户在保单上开了绿灯。叶梅的答谢宴上，陈重被灌醉，醒来以后发现自己躺在叶梅的床上……故作镇定的陈重根本不会想到，一环又一环的圈套已经等他很久……
因家族遭到权臣迫害，独孤伽罗自小就以独立坚强要求自己。时其夫君杨坚已展现不凡气概，他骁勇善战，立下赫赫战功，并在乱世之中登上皇位，建立隋朝，统一中国，而后大力发展文化经济。 独孤伽罗尽心辅佐，与杨坚一同倡导节俭，协助杨坚成就“开皇之治”，国泰民安，与杨坚并尊为“二圣”，在杨坚开创隋朝盛世中起到了不可或缺的作用。 独孤伽罗和杨坚携手走过人生风雨，始终夫妻恩爱，伉俪情深，她时刻督促杨坚勤政爱民，无论处于人生何种际遇，夫妻二人保持着勤俭朴实的家风，创造了中国古代帝王夫妻后宫生活的佳话。
Compared with the online work class, the online work class mode company was established relatively early and has a relatively rich variety of courses. Thanks to the long development time, its curriculum has been continuously polished and matured in market feedback. In addition, its company's positioning has been continuously adjusted according to market demand, forming a relatively accurate positioning, with relatively wide product coverage and more specific details. However, there is a new trend that is worth noting. At present, most offline thinking ability training institutions have also begun to think about online development to effectively supplement offline education.
Franklin summed up his deliberate practice method!
