kotlin 覆盖属性_Kotlin程序| 方法覆盖的示例

kotlin 覆盖属性

方法重载 (Method Overriding)

• Method overriding allows derived class has the same function name and signature as the base class

  方法重写允许派生类具有与基类相同的函数名称和签名

• By method overriding we can provide different implementation into the derived class of base class methods.

  通过方法重写，我们可以为基类方法的派生类提供不同的实现。

• By default method is final in Kotlin class, to make them overridable declare the method with 'open'

  默认情况下，方法在Kotlin类中是final，要使其可重写，请使用“ open”声明该方法

• The open modifier does not affect when added on members of a final class (i.e.. a class with no open modifier).

  当将open修饰符添加到最终类的成员(即没有open修饰符的类)的成员上时，则不受影响。

• Marked function with 'override' into derived class while overriding the base class method.

  在覆盖基类方法的同时，将具有“覆盖”功能的标记为派生类。

• Use 'super' to call the base class implementation of the method from child class

  使用“ super”从子类中调用方法的基类实现

Kotlin中的方法重写程序 (Program for method overriding in Kotlin)

package com.includehelp//Declare Base class, //marked with 'open' to make inheritable open class Person{//marked function with 'open' to make//overridableopen fun printMessage(){println("Message for Person")} }//Derived class extends Person class class Child: Person() {//Override base class methodsoverride fun printMessage(){println("Message for Child")} }//marked derived class with 'open' //to make further inheritable by its //child class open class Boy : Person(){//A member marked override is itself open, //i.e. it may be overridden in subclasses.//If you want to prohibit re-overriding, use finalfinal override fun printMessage(){println("Message for Boys")} }//Derived class class Hero : Boy() {//Declare member functionfun printData(){//calling , Boy Class Implementation //of printMessage() functionsuper.printMessage()println("Hello Hero")} }fun main(args:Array<String>){//Create Person class Instance and Called Methods, //it will invoke Base class version of methodsPerson().printMessage()//Create class Instance and Called Methods,//it will invoke Child class version of methodsChild().printMessage()//Create class Instance and Called MethodsHero().printData() }

Output:

输出：

Message for Person Message for Child Message for Boys Hello Hero

翻译自: https://www.includehelp.com/kotlin/example-of-method-overriding.aspx

kotlin 覆盖属性

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