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Android基础--kotlin（十二）kotlin 委托

kotlin 委托委托模式是软件设计模式中的一项基本技巧。在委托模式中，有两个对象参与处理同一个请求，接受请求的对象将请求委托给另一个对象来处理。Kotlin 直接支持委托模式，更加优雅，简洁。Kotlin 通过关键字 by 实现委托。类委托类的委托即一个类中定义的方法实际是调用另一个类的对象的方法...

Android基础--kotlin（十一）Kotlin 对象表达式和对象声明

Kotlin 对象表达式和对象声明Kotlin 用对象表达式和对象声明来实现创建一个对某个类做了轻微改动的类的对象，且不需要去声明一个新的子类。对象表达式通过对象表达式实现一个匿名内部类的对象用于方法的参数中：window.addMouseListener(object : MouseAdapter...

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Android基础--kotlin（十）Kotlin 枚举类

Kotlin 枚举类枚举类最基本的用法是实现一个类型安全的枚举。枚举常量用逗号分隔,每个枚举常量都是一个对象。enum class Color{ RED,BLACK,BLUE,GREEN,WHITE }枚举初始化每一个枚举都是枚举类的实例，它们可以被初始化：enum class Color(val ...

Android基础--kotlin（八）Kotlin 扩展数据类与密封类

数据类Kotlin 可以创建一个只包含数据的类，关键字为 data：data class User(val name: String, val age: Int)编译器会自动的从主构造函数中根据所有声明的属性提取以下函数：equals() / hashCode() toString() 格式如 "U...

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