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{Java is a typical object-oriented programming language, so this tutorial is based on Java to explain these 23 design patterns. If you don't know Java, please hit the "Java Tutorial" to learn.There is a misconception circulating on the Internet in China: the law of 10,000 hours. It is so deeply rooted in people's hearts, however, it is really wrong! Psychologist Eriksson, the creator of the concept of "deliberate practice", published his first Chinese book, telling you how to go from novice to outstanding expert.随着他成功的为期两个月的大学喜剧之旅即将结束，皮特带着一个新的面貌和自信来匹配，带着一个大学年龄的有抱负的喜剧演员Jaboukie在他的翼下。 但皮特回到纽约时发现他在喜剧酒窖里有一次尴尬的重逢和大试，可能会改变一切。Define two implementation classes respectively:(2) Purposeful practice is focusedIndia's Kyanbitu vegetable market is booming. Here, there are a group of very poor peddlers. Every morning, they will borrow 1,000 rupees from the rich, then go to purchase the goods, and get 1,100 rupees back after selling them, while at night, they will give back 1,050 rupees to the rich.