应届生及亚马逊面试必考，IT求职必备基础。 S - Single-responsiblity principle 单一责任原则 O - Open-closed principle 开发封闭原则 L - Liskov substitution principle 里氏替换原则 I - Interface segregation principle 接口分离原则 D - Dependency Inversion Principle 依赖反转原则