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迪米特法则(Law of Demeter LoD) –>最少只是原则(Least Knowledge Principle,LKP) 一个对象应该对其它的对象有最少的了解 阅读全文
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开放关闭原则(Open Close Principle OCP)Software entities like classes,modules and functions should be open for extension but closed for modifications.一个软件实体如类、模块和函数应该对扩展开放，对修改关闭。 阅读全文
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接口隔离原则Interface Segregation PrincipleClients should not be forced to depend upon interfaces that they don’t use客户端不应该依赖它不需要的接口The dependency of one class to another one should depend on the smallest possible interface类间的依赖关系应该建立在最小的接口上 阅读全文
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依赖倒置原则(Dependence Inversion Principle) High level modules should not depend upon low level modules. Both should depend upon abstractions. Abstractions should not depend upon details.Details should depend upon abstractions. 高层模块不应该依赖低层模块，两者都应该依赖其抽象；抽象不应该依赖细节；细节应该依赖抽象 。 阅读全文
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里氏替换原则 If for each object o1 of type S there is an object o2 of type T such that for all programs P defined in terms of T, the behavior of P is unchanged where o1 is substituted for o2 then S is a subtype of T。（Functions that use pointers or references to base classes must be able to use object of d 阅读全文
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Single Responsibility Principle应该有且只有一个原因引起类的变更 阅读全文
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ThreadLocal即线程局部变量。功能：为每个使用该变量的线程，提供一个该变量的副本。其实ThreadLocal中拥有一个Map，它是线程->变量的映射。主要方法有三个，set，get，initValue。set与get的作用不用多讲，主要是initValue，它默认返回的是null，子类可以通过重载该方法，来改变默认值。1publicvoidset(Tvalue){2Threadt=Thread.currentThread();3ThreadLocalMapmap=getMap(t);4if(map!=null)5map.set(this,value);6else7createMa 阅读全文