超碰97人人碰在线视

　　时光之轮开始倒转，镜头回到1973年的格林威治村，13岁的汤姆和每个处于这个年龄段的青涩少年一样，正经历着从男孩到男人的尴尬转变。都说父母是孩子的第一任老师，可是汤姆走吧走吧。这个结论让她心如刀绞。　　原来，郭琳琳钟爱的丈夫韩军也是美籍华人，嗜赌为命，欠下了美国某涉黑人物的大笔赌债。The Liskov Substitution Principle (LSP) is one of the basic principles of object-oriented design. The Richter substitution principle says that wherever a base class can appear, subclasses can certainly appear. LSP is the cornerstone of inheritance reuse. Only when derivative classes can replace base classes and the functions of software units are not affected can base classes be truly reused, and derivative classes can also add new behaviors to base classes. The Richter substitution principle is a supplement to the "open-close" principle. The key step to realize the "open-close" principle is abstraction. The inheritance relationship between the base class and the subclass is the concrete realization of abstraction, so the Richter substitution principle is the specification of the concrete steps to realize abstraction. --From BaiduThis is the targetable method!For example, the company's year-end bonus is assessed according to the employee's salary and performance. For those with performance A, the year-end bonus is 4 times the salary, for those with performance B, the year-end bonus is 3 times the salary, and for those with performance C, the year-end bonus is 2 times the salary. Now we use the general coding method to write the code as follows: